MC 785-SC. Operating Manual (Wall and panel mounting) Type: MANUAL Number of pages: 32 Version: V2.3

Transcription

1 MC 785SC Operating Manual (Wall and panel mounting) Description : MC 785SC Step Control Doc.nr.: 2291 Type: MANUAL Number of pages: 32 Version: V2.3 File: Do2291 MC785SC v23 EN.wpd Software: MC785SC V2.11 By: BJB Date: VDH Products BV Roden Holland Signed: File: Doc'2

2 MC 785SC Client : General Page : 2 of 32 Table of contents 1. Technical specifications... 3 General... 3 Front... 3 Inputs and outputs Functional specifications Control... 6 General... 6 Switching the controller on and off Password Readout and setting the clock The SUCTION part (compressorside)... 7 Readout selection on the SUCTION display Showing status of the compressors Readout or changing the suction pressure (/temperature) setpoint Setting a compressor in or out of service Resetting operation hours of a particular compressor The DISCHARGE part (condenserside)... 8 Readout selection on the DISCHARGE display Showing status of the condensers Readout or changing the discharge pressure (/temperature) setpoint Setting a condenser in or out of service Resetting operation hours of a particular condenser Programming internal settings... 9 Parameter table... 9 *) Table of assignment of relay outputs...18 $) Table of assignment of analog outputs (1Vdc)...19 #) Table of assignment of digital inputs Alarms Function flow...22 Operation of the Pband on the suction pressure side (Compressorside)...22 Overview of the function flow for 4compressors for the switching up and down of compressors...22 Overview of the function flow for compressor with 5cylinders...23 Working of compressor control with unequal steps Front view Diagrams of connections Dimensions...31 The information contained in this document is assumed to be accurate. However VDH Products BV accepts no liability for eventual mistakes or errors and has the right to change this document without notice.

3 MC 785SC Client : General Page : 3 of Technical specifications General Type : MC 785SC (StepControl) Wallmounting: Housing : Grey plastic Material : Polystyrol 454h KG 2 natur BASF Dimensions : 213 x 18 x 85mm (whd) Front : Polycarbonate (IP44) Panelmounting: Housing : Steel plate panel Material : Steel in silver grey Dimensions : 217 x 155 x 85mm (whd) Panel cutout : min. 28 x 146mm (wh) Front : Polycarbonate (IP44) Supply : 23 Vac; 5/6 Hz (1/+5%). Used power : 9 VA Pressure range : /+5 per.1 (Suction: 4/+5 C per.1 C) (Discharge: 3/+1 C per.1 C) Accuracy : ±.5 % of the range Operation temperature : 2/+5 C Operation rel. humidity : 1/+9 % RH not condensing Front Displays : 4digit display for suction pressure (SUCTION) with 7 day LEDs 4digit display for discharge pressure (DISCHARGE) with 7 day LEDs LED bars : 8 LEDs on/off and 8 LEDs delay, for maximal 8 compressors 8 LEDs on/off and 8 LEDs delay, for maximal 8 condenser fans Keys : ON/OFF = On/off key controller with LED indication = Clock key with LED indication PRG = Program key with LED indication RESET/ALARM = Reset alarm key with LED indication (2x) = Up keys (2x) = Down keys SET (2x) = Setpoint keys with LED indication SELECT (2x) = Display select keys at displays MODE/SELECT (2x) = Mode select keys LEDs at displays : (2x) = LED indications for readout in O C (2x) = LED indications for readout in degrees Celsius Hrs (2x) = LED Indications for readout in operation hours % (2x) = LED indications for readout in percentage (2x) = LED indications control is increasing (2x) = LED indications control is decreasing Service (2x) = LED indications service Fail (2x) = LED indications fail (2x) = LED indications alarm

4 MC 785SC Client : General Page : 4 of 32 Inputs and outputs Pressure gauges : Pressure sensor1 Suction (4/2mA signal, PX77/2: 2wire system) Pressure sensor2 Discharge (4/2mA signal, PX77/2: 2wire system) Temperature sensors : SM811 temperature sensor1 Suction (1KOhm PTC, 2wire) SM811 temperature sensor2 Discharge (1KOhm PTC, 2wire) Analog outputs : Out1 [1] (/1Vdc signal, 2wire (Rb min. 1 Kohm) Out2 [2] (/1Vdc signal, 2wire (Rb min. 1 Kohm) Communications : RS485 Network (2wire shielded; A,B,GND) I 2 Cbus (extensionbus) (2wire shielded; SDA, SCL, V) Relays : Relay1 [1] programmable. (C/NO/NC, 25Vac/1A not inductive) Next relays have one common; Relay2 [2] programmable (NO, 25Vac/1A not inductive) Relay3 [3] programmable (NO, 25Vac/1A not inductive) Relay4 [4] programmable (NO, 25Vac/1A not inductive) Relay5 [5] programmable (NO/NC, 25Vac/1A not inductive) 2. Functional specifications The MC 785SC is an 8stage step controller, which controls maximal 8 compressors and 8 condenser fans stepping up or down, based on the measured suction and discharge pressure and its setpoints. To control stepping up or down the controller can be set to the following choices: Compressor control: On/off control, with or without valve lifting (xstage compressors) or Frequency control Condenser control: On/off control or Frequency control The controller can also step up or down a compressor or condenser, based on the total operation hours or based on the power of the compressors or condensers. It is also possible to disable compressors or condensers for maintenance or when a failure occurs. To safeguard the control it is possible to set: a minimum and maximum pressure alarm, a minimum and maximum pressure failure, a minimum and maximum temperature alarm, a minimum and maximum temp. failure. All inputs and outputs can be assigned thru setting internal parameters, so an efficient use of the inputs and outputs is possible. If not enough inputs or outputs are available on the controller these can be extended by use of extra LMS Modules connected at the I 2 Cbus. At max the following LMS modules can be connected to the controller; 4 extra LMSRelayModules, with 4 relays per module (uses a 1mA per module) 4 extra LMSAnalogoutModules, with 4 analog outputs per module (uses 1mA /mod) 4 extra LMSDigitalinModules, with 6 digital inputs per module (uses 1mA/module) To use these modules sufficient SupplyModule(s) must be used, see connection drawing 1822.

5 MC 785SC Client : General Page : 5 of 32 5 relay outputs and 2 analog outputs are standard on the MC785SC, there are no digital inputs available, all other needed outputs can be obtained thru extra LMSmodules. Output(s) can by assigned to: Compressor on relay Compressor no load on relay Compressor 5% relay for 2stage (valve lifting) compressors. Compressor 66% relay + 33% relay for 3stage (valve lifting) compressors. Compressor 75% relay + 5% relay + 25% relay for 4stage (valve lifting) compressor. Compressor 8% relay + 6% relay + 4% relay + 2% relay for 5stage (valve lifting) compr. Attention: For compressors with more cylinders only the first valve lifting relay will be assigned, the following relays required will be assigned automatically after the previous relay(s). e.g. Compressor1 as 4stage compressor (Parameter P11=4) and the first valve lifting relay assigned to relay 3 of the first LMS Relay Module (Parameter P113 = 1 3") gives: Relay3 of LMSRelayModule 1 = 75% valve lifting contact, Relay4 of LMSRelayModule 1 = 5% valve lifting contact and Relay1 of LMSRelayModule 2 = 25% valve lifting contact. Compressor analog output...1vdc Condenser on contact Condenser 5% / 1% relay for a 2stage condenser. Condenser analog output...1vdc Input(s) can by assigned to: Compressor failure Condenser failure (with NC (normally closed) or NO (normally open) input contact) (with NC (normally closed) or NO (normally open) input contact) A general alarm is also available to be assigned. This relay is normally active CNO is closed and when an alarm occurs, which has not been reset, the relay switches off CNC is closed. All settings and controls can be authorised by a password, to prevent unauthorised using of the controller. There is also a RS485network available on the controller for controlling the MC785SC by a PC. For this job the controller must be attached to a PCinterface and the PC must have an installed software program for this job.

6 MC 785SC Client : General Page : 6 of Control The MC785SC is divided into two parts: on the left side is the compressor part (SUCTION) and on the right side is the condenser part (DISCHARGE). Both these parts are almost identical for control or readout. The current status of the controller is shown on the front. General: Switching the controller on and off. By pressing the ON/OFF key the controller can be switched on or off. Password. Before any change can be made, the controller will ask for a password. In the SUCTION display appears Code and in the DISCHARGE display. By pressing the UP or DOWN keys the last number will be changed, set it to the right number (see parameter 999). By pressing the SELECT key the next number can be set (with the UP or DOWN keys). All four numbers must be set to the correct code (P 999) and, as a last action, press the SELECT key. If the code is correct, the settings of the controller can now be changed. The correct password can be used for 2 minutes, after which time it deactivates so that the controller is locked again. The password can be set at the internal parameter P999 and is set on a default value as shown in the parameter table. Attention: Remember a set password well and keep it in a safe place! Readout and setting the clock. Press the CLOCK key to readout the time on the DISCHARGE display. To set the clock, first readout the clock as above, then press the right SELECT key in order to change the hours and minutes with the right UP and/or DOWN keys. Then press the right SELECT key again to change the day setting with the right UP and/or DOWN keys. Finally, press the right SELECT key yet again to activate the new time setting. If no key is pressed for 1 seconds, the controller will return to its normal function.

7 MC 785SC Client : General Page : 7 of 32 The SUCTION part (compressorside): Readout selection on the SUCTION display. By pressing the left SELECT key next to the SUCTION display once or more, the following values can be shown on the display: S The suction pressure in s, LED next to the display lights up. S The calculated suction temperature (depends on coolant) in degrees Celsius, LED s and O C light up. S The suction temperature, of temperature sensor1, in degrees Celsius, LED O C lights up. S The operation hours of one of the compressors, to select another compressor, press the left UP or DOWN keys. To show which compressor has been selected for readout, the corresponding LED in the compressor bar will light up and the LED Hrs. will light up. S Current control signal in percentage, LED % lights up. Further, there are two more LEDs ( and ) in the SUCTION display panel, these LED s indicate if the control signal is increasing or decreasing the compressor power. Showing status of the compressors. In the COMPRESSOR panel the status of the compressors is shown in different ways which can be selected by the left MODE/SELECT key. These readout modes are; S Or S Normally the LED s Service and Fail will not be lit, then the LED bars indicate: Upper LED bar shows which compressors are active. Lower LED bar shows which compressors are running in time delay. LEDs Service and Fail are lit, then the LED bars indicate: Upper LED bar shows which compressor is in service. (These compressor(s) will not be selected for controlling by the controller). Lower LED bar shows which compressor is in failure. Readout or changing the suction pressure (/temperature) setpoint. By pressing the left SET key, the suction pressure setpoint is shown in the SUCTION display. To indicate this the lights up. By pressing the left SELECT key, the setpoint will be shown in degrees Celsius (also adjustable), LEDs and O C light up. To change the setpoint value now press the left UP or DOWN keys. 1 seconds after the keys have been released the new setpoint will be active and the controller will return to its normal display function again. Notice that the controller calculates the temperature signals to pressure signals and controls on the pressure signals. Setting a compressor in or out of service. To put a particular compressor out of function, it must be set in service. To see which compressors are in service press the PRG key together with the left MODE/SELECT key. The LED Service will light up and the LED bars show: Upper LED bar shows which compressors are in service and Lower LED bar shows the currentlyselected compressor. With the left UP and DOWN keys another compressor can be selected. The compressor to be put in or out service can be put in or out of service by pressing the left MODE/SELECT key. Resetting operation hours of a particular compressor. Read out the operation hours on the SUCTIONdisplay by pressing the left SELECT key once or more, until the LED Hrs lights up. Then select the compressor which has to be set to zero with the left UP and/or DOWN keys. Now press the RESET/ALARM key, hold it down and press simultaneously on the left MODE/SELECT key to set the selected compressor operation hours to zero.

8 MC 785SC Client : General Page : 8 of 32 The DISCHARGE part (condenserside): Readout selection on the DISCHARGE display. By pressing the right SELECT key next to the DISCHARGE display once or more, the following values can be shown on the display: S The discharge pressure in s, LED next to the display lights up. S The calculated discharge temperature (depends on coolant) in degrees Celsius, LED s and O C light up. S The discharge temperature, of temperature sensor2, in degrees Celsius, LED O C lights up. S The operation hours of one of the condensers, to select another condenser, press the right UP or DOWN keys. To show which condenser has been selected for readout, the corresponding LED in the condenser bar will light up and the LED Hrs. will light up. S Current control signal in percentage, LED % lights up. Further, there are two more LEDs ( and ) in the DISCHARGE display panel. These LEDs indicate if the control signal is increasing or decreasing the condenser power. Showing status of the condensers. In the CONDENSER panel the status of the condensers is shown in different ways which can be selected by the right MODE/SELECT key. These readout modes are: S Or S Normally the LEDs Service and Fail will not be lit, then the LED bars indicate: Upper LED bar shows which condensers are active. Lower LED bar shows which condensers are running in time delay. LEDs Service and Fail are lit, then the LED bars indicate: Upper LED bar shows which condenser is in service. (These condenser(s) will not be selected for controlling by the controller). Lower LED bar shows which condenser is in failure. Readout or changing the discharge pressure (/temperature) setpoint. By pressing the right SET key, the discharge pressure setpoint is shown in the DISCHARGE display. To indicate this the lights up. By pressing the right SELECT key the setpoint will be shown in degrees Celsius (also adjustable); LEDs and O C light up. To change the setpoint value now press the right UP or DOWN keys. 1 seconds after the keys have been released the new setpoint will be active and the controller will return to its normal display function again. Notice that the controller calculates the temperature signals to pressure signals and controls on the pressure signals. Setting a condenser in or out of service. To put a particular condenser out of function, it must be set in service. To see which condensers are in service press the PRG key together with the right MODE/SELECT key. The LED Service will light up and the LED bars show: Upper LED bar shows which condensers are in service and Lower LED bar shows the currentlyselected condenser. With the right UP and DOWN keys another condenser can be selected. The condenser to be put in or out of service can be put in or out of service by pressing the right MODE/SELECT key. Resetting operation hours of a particular condenser. Read out the operation hours on the DISCHARGEdisplay by pressing the right SELECT key once or more, until the LED Hrs lights up. Then select the condenser which has to be set to zero with the right UP and/or DOWN keys. Now press the RESET/ALARM key, hold it down and press simultaneously on the right MODE/SELECT key to set the selected condenser operation hours to zero.

9 MC 785SC Client : General Page : 9 of Programming internal settings By pressing the PRG key for more than 5 seconds, the Internal Parameter Menu is entered. In the SUCTION display a P appears with a number behind it. With the left UP and/or DOWN keys the required parameter can be selected. The value of the selected parameter is shown in the DISCHARGE display. By pressing the UP and/or DOWN keys, the value can be adjusted. If during 3 seconds no key is touched or the ON/OFF key is pressed, the display reverts to the normal operation mode. Parameter table. PNr Description Range Unit Default Parameters General P 1 P 11 P 12 P 13 P 14 P 15 P 16 P 17 P 18 P 19 Minimal adjustable pressure setpoint compressor Maximal adjustable pressure setpoint compressor Pband compressor Maximum suction pressure before the first compressor will be switched on without delay Switch on delay for the next step Time delay for next compressor step Time delay for previous compressor step Type of compressor control = Switching up/down based on running hours (with equal capacities) 1 = Switching up/down based on longest on/off (with equal capacities) 2 = Capacity calculation (with unequal capacities) Compressor strategy = None restrictions 1 = Let active compressor by active 2 = Switch compressors only up Minimum capacity gain per step (as P17=2) 1..5,..5,,1..5, ,1..3, Sec. Sec. Sec. kw 1, 5, 8, , P 2 P 21 P 22 Minimum time between switching the same compressor off and on Noload running time on starting compressor (valves are lifted) Minimum ontime of compressor Sec. Sec. Sec P 23 P 24 Pumpingout pressure value Pumpingout pressure active 1,..5, =no 1=yes 1, (no) P 25 P 26 Pressure release for economizer Differential economizer release 1,..5,,1..,5 2,3,3

10 MC 785SC Client : General Page : 1 of 32 PNr Description Range Unit Default P 3 P 31 P 32 P 35 P 36 P 37 Minimum adjustable pressure setpoint Condenser Maximum adjustable pressure setpoint Condenser Pband condenser control Switching up time between the condensers Switching down time between the condensers Type of condenser control = Switching up/down on running hours (equal capacities) 1 = Switching up/down on set sequence (1,2,3,4...4,3,2,1)..5,..5,,1..5, Sec. Sec. 1, 5, 8, 3 3 P 4 P 41 Suction temperature sensor(sensor1) = Absent 1 = Present, readout only 2 = Present, readout and alarms Discharge temperature sensor (sensor2) = Absent 1 = Present, readout only 2 = Present, readout and alarms 3 = Present, outdoor temperature for Delta T control P 42 P 43 P 44 P 45 P 46 P 47 Minimum suction temp. sensor alarm Minimum suction temp. sensor failure (Everything switches off) Maximum discharge temp. sensor alarm Maximum discharge temp. sensor failure (Everything switches off) Offset suction temperature sensor Offset discharge temperature sensor 4..5, 4..5, 4..1, 4..1, 1..1, 1..1, O C O C O C O C O C O C 4, 4, 1, 1,,, P 5 P 51 P 52 P 6 Low pressure alarm input (see table) Fluid level too low warning input (see table) Level input gives fatal error Alarm relay (normally powered) (see table).. 4nc6.. 4nc6 =no, 1=yes P 7 P 71 P 72 P 73 P 8 P 81 P 82 Suction pressure corresponding to 4. ma Suction pressure corresponding to 2. ma Offset pressure sensor suction pressure Read out suction pressure senor in,1 Discharge pressure corresponding to 4. ma Discharge pressure corresponding to 2. ma Offset pressure sensor discharge pressure 1,..5, 1,..5, 1..1, =no, 1=yes 1,..5, 1,..5, 1..1,, 25,,, 25,, P 9 P 91 P 92 P 93 Coolant type: = unknown 1 = R22 2 = R134A 3 = R44A (bubble and dew point) 4 = R47A (bubble and dew point) 5 = R47C (bubble and dew point) 6 = R717 (Ammoniac) 7 = R57 Super heat detection active (=no, 1=yes) Super heat warning Super heat alarm..7..1,..5,,..5, Kelvin Kelvin 8, 7,

11 MC 785SC Client : General Page : 11 of 32 PNr Description Range Unit Default P 95 P 96 P 97 Outdoor temp. control active (=no, 1=yes) Delta T condenser with outdoor temperature Maximum pressure set point condenser..1 1,..5,,..5, Kelvin (no) 1, 5, P1 P11 P12 P15 P16 P17 Minimum pressure alarm suction side Minimum pressure alarm suction side delay Minimum pressure failure suction side (This is not delayed and the compressors are blocked) Maximum pressure alarm discharge side Maximum pressure alarm discharge side delay Maximum pressure failure discharge side (This is not delayed and the compressors and condensers are blocked) 1,..5, ,..5, 1,..5, ,..5, Sec. Sec.,5 1 18, 1 2, Parameters for Compressors 1 to 8 P11 P111 P112 P113 P114 P115 P116 P117 P118 P119 P12 P121 P122 P123 Compressor1 type: = not present 1 = on/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) 7 = FRQ 1Stage frequency controlled Power Compressor1 in KW On/off relay Compressor1 Valve lifting relay Compressor1 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor1 (1V) Failure input Compressor1 High pressure input Compressor1 Failure oil pressure contactinput Compressor1 Operationswitch input Pause input Economizer relay Minimum percentage output frequency control Maximum percentage output frequency control nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S # % %

12 MC 785SC Client : General Page : 12 of 32 PNr Description Range Unit Default P13 P131 P132 P133 P134 P135 P136 P137 P138 P139 P14 P141 Compressor2 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor2 in KW On/off relay Compressor2 Valve lifting relay Compressor2 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor2 (1V) Failure input Compressor2 High pressure input Compressor2 Failure oil pressure contractinput Compressor2 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1 P15 P151 P152 P153 P154 P155 P156 P157 P158 P159 P16 P161 Compressor3 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor3 in KW On/off relay Compressor3 Valve lifting relay Compressor3 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor3 (1V) Failure input Compressor3 High pressure input Compressor3 Failure oil pressure contactinput Compressor3 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1

13 MC 785SC Client : General Page : 13 of 32 PNr Description Range Unit Default P17 P171 P172 P173 P174 P175 P176 P177 P178 P179 P18 P181 Compressor4 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor4 in KW On/off relay Compressor4 Valve lifting relay Compressor4 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor4 (1V) Failure input Compressor4 High pressure input Compressor4 Failure oil pressure contactinput Compressor4 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1 P19 P191 P192 P193 P194 P195 P196 P197 P198 P199 P2 P21 Compressor5 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor5 in KW On/off relay Compressor5 Valve lifting relay Compressor5 For noload running, relays is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor5 (1V) Failure input Compressor5 High pressure input Compressor5 Failure oil pressure contactinput Compressor5 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1

14 MC 785SC Client : General Page : 14 of 32 PNr Description Range Unit Default P21 P211 P212 P213 P214 P215 P216 P217 P218 P219 P22 P221 Compressor6 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor6 in KW On/off relay Compressor6 Valve lifting relay Compressor6 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor6 (1V) Failure input Compressor6 High pressure input Compressor6 Failure oil pressure contactinput Compressor6 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1 P23 P231 P232 P233 P234 P235 P236 P237 P238 P239 P24 P241 Compressor7 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor7 in KW On/off relay Compressor7 Valve lifting relay Compressor7 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are assigned automatically hereafter. (For operation see page 5) Analog output Compressor7 (1V) Failure input Compressor7 High pressure input Compressor7 Failure oil pressure contactinput Compressor7 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1

15 MC 785SC Client : General Page : 15 of 32 PNr Description Range Unit Default P25 P251 P252 P253 P254 P255 P256 P257 P258 P259 P26 P261 Compressor8 type: = Not present 1 = On/off 2 = 2Cylinder (51%) 3 = 3Cylinder (33661%) 4 = 4Cylinder (255751%) 5 = 5Cylinder (24681%) 6 = Screw compressor (5751%) Power Compressor8 in KW On/off relay Compressor8 Valve lifting relay Compressor8 For noload running, relay is active when starting First valve lifting relay..% Percentage depends on number of cylinders, subsequent cylinders are automatically assigned hereafter. (For operation see page 5) Analog output Compressor8 (1V) Failure input Compressor8 High pressure input Compressor8 Failure oil pressure contactinput Compressor8 Operationswitch input Pause input Economizer relay nc6.. 4nc6.. 4nc6.. 4nc6.. 4nc KW $ S #.1 Parameters for Condensers 1 to 8 fans P27 P271 P272 Condenser1 type: = Not present 1 = On/off 2 = 2speed (5%1%) 3 = FRQ frequency controlled On/off relay Condenser1 Relay for 5% 1% Relay is active at 1% drive P273 P274 P275 P276 Analog output Condenser1 (1V) Failure input Condenser1 Minimum percentage output frequency control Maximum percentage output frequency control nc $ % % 5 1 P29 P291 P292 P293 P294 Condenser2 type: = Not present 1 = On/off 2 = 2speed (5%1%) On/off relay Condenser2 Relay for 5% 1% Relay is active at 1% drive Analog output Condenser2 (1V) Failure input Condenser nc6 $

16 MC 785SC Client : General Page : 16 of 32 PNr Description Range Unit Default P31 P311 P312 P313 P314 Condenser3 type: = Not present 1 = On/off 2 = 2Speed (5%1%) Aan/uit relais Condenser3 Relay for 5% 1% Relay is active at 1% drive Analog output Condenser3 (1V) Failure input Condenser nc6 $ P33 P331 P332 Condenser4 type: = Not present 1 = On/off 2 = 2speed (5%1%) On/off relay Condenser4 Relay for 5% 1% Relay is active at 1o% drive P333 P334 Analog output Condenser4 (1V) Failure input Condenser nc6 $ P35 P351 P352 Condenser5 type: = Not present 1 = On/off 2 = 2speed (5%1%) On/off relay Condenser5 Relay for 5% 1% Relay is active at 1% drive P353 P354 Analog output Condenser5 (1V) Failure input Condenser nc6 $ P37 P371 P372 Condenser6 type: = Not present 1 = On/off 2 = 2speed (5%1%) On/off relay Condenser6 Relay for 5% 1% Relay is active at 1% drive P373 P374 Analog output Condenser6 (1V) Failure input Condenser nc6 $ P39 P391 P392 Condenser7 type: = Not present 1 = On/off 2 = 2speed (5%1%) On/off relay Condenser7 Relay for 5% 1% Relay is active at 1% drive P393 P394 Analog output Condenser7 (1V) Failure input Condenser nc6 $

17 MC 785SC Client : General Page : 17 of 32 PNr Description Range Unit Default P41 P411 P412 Condenser8 type: = Not present 1 = On/off 2 = 2speed (5%1%) On/off relay Condenser8 Relay for 5% 1% Relay is active at 1% drive P413 P414 Analog output Condenser8 (1V) Failure input Condenser nc6 $ Parameters for external setpoints P5 External compressors setpoint input1.. 4nc6 P51 External compressors setpoint P51 External compressors setpoint input2.. 4nc6 P511 External compressors setpoint P52 External compressors setpoint input3.. 4nc6 P521 External compressors setpoint Parameters for Network P8 P81 Network number Log interval Minute s 15 Parameters Software/Series number etc. P991 P992 P993 P999 Software version no. Serial number Production date (year/week) Password ( = password not active) Key to symbols: *) = See table of assignment of relay outputs #) = See table of assignment of digital inputs $) = See table of assignment of analog outputs Remarks about P13 to P15: Whit P13 it is possible to enter a limit for switching on the first compressor. As soon as the pressure is higher then P13 the first compressor will switch on without delay. The minimal off time (P2) will still be valid. If the value from P15 is lower then the value of P14 then the value of P14 will be used. If another step has to switch on, the value of P15 will be used. Remarks about P5 to P521: When one or more inputs are closed the input with the lowest setpoint will be active as setpoint for the compressors! During the readout of the setpoint a flashing c will indicate that an input is active. In this mode the set point CANNOT be changed.

18 MC 785SC Client : General Page : 18 of 32 *) Table of assignment of relay outputs Value Relay number On Controller/Module Contact No relay assigned Remarks: Relay1 Relay2 Relay3 Relay4 Relay5 Relay1 Relay2 Relay3 Relay4 Relay5 Relay6 Relay7 Relay1 Relay2 Relay3 Relay4 Relay5 Relay6 Relay7 Relay1 Relay2 Relay3 Relay4 Relay5 Relay6 Relay7 Relay1 Relay2 Relay3 Relay4 Relay5 Relay6 Relay7 MC785SC controller LMSrelaymodule1 (JP1 with jumper and JP2 with jumper) LMSrelaymodule2 (JP1 without jumper and JP2 with jumper) LMSrelaymodule3 (JP1 with jumper and JP2 without jumper) LMSrelaymodule4 (JP1 without jumper and JP2 without jumper) CNONC NO common C NO,, NO,, NO/NC,, CNONC CNO CNO CNO CNONC CNONC CNONC CNONC CNO CNO CNO CNONC CNONC CNONC CNONC CNO CNO CNO CNONC CNONC CNONC CNONC CNO CNO CNO CNONC CNONC CNONC The 4 and 7relay type LMS modules may be mixed together but at maximum 4 relay modules can be assigned. So at minimum there are 5 relays available on MC 785SC and at maximum there are 5+4x7=33 relays available MC785SC(5) + 4x LMS 7RELAY MODULE.

19 MC 785SC Client : General Page : 19 of 32 $) Table of assignment of analog outputs (1Vdc) Value Analog output number On Controller/Module Signal No output assigned Analogoutput1 Analogoutput2 Analogoutput1 Analogoutput2 Analogoutput3 Analogoutput4 Analogoutput1 Analogoutput2 Analogoutput3 Analogoutput4 Analogoutput1 Analogoutput2 Analogoutput3 Analogoutput4 Analogoutput1 Analogoutput2 Analogoutput3 Analogoutput4 MC785SC regelaar LMSanalogmodule1 (JP1 with jumper and JP2 with jumper) LMSanalogmodule2 (JP1 without jumper and JP2 with jumper) LMSanalogmodule3 (JP1 with jumper and JP2 without jumper) LMSanalogmodule4 (JP1 without jumper and JP2 wihtout jumper) 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc 1Vdc #) Table of assignment of digital inputs Value Digital input number On Controller/Module Input contact No input assigned Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 LMSdiginmodule1 (JP1 with jumper and JP2 with jumper) LMSdiginmodule2 (JP1 without jumper and JP2 with jumper) LMSdiginmodule3 (JP1 with jumper and JP2 without jumper) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make)

20 MC 785SC Client : General Page : 2 of 32 Value Digital input number On Controller/Module Input contact nc1 1nc2 1nc3 1nc4 1nc5 1nc6 2nc1 2nc2 2nc3 2nc4 2nc5 2nc6 3nc1 3nc2 3nc3 3nc4 3nc5 3nc6 4nc1 4nc2 4nc3 4nc4 4nc5 4nc6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 Digital input1 Digital input2 Digital input3 Digital input4 Digital input5 Digital input6 LMSdiginmodule4 (JP1 without jumper and JP2 without jumper) LMSdiginmodule1 (JP1 with jumper and JP2 with jumper) LMSdiginmodule2 (JP1 without jumper and JP2 with jumper) LMSdiginmodule3 (JP1 with jumper and JP2 without jumper) LMSdiginmodule4 (JP1 without jumper and JP2 without jumper) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NOC (make) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break) NCC (break)

21 MC 785SC Client : General Page : 21 of Alarms The following alarm messages may appear in the SUCTIONdisplay: E1 = Pressure sensor suction defect. Action: Everything off E3 = Temperature sensor suction defect. Action: None (no control function) E1 = Low pressure alarm. Action: None E2 = Low pressure failure. Action: Everything off E3 = External low pressure failure. Action: Everything off E4 = Low temperature alarm Action: None E5 = Low temperature failure. Action: Everything off E6 = Oil pressure failure. Action: Turn off compressor concerned E7 = Fluid level warning. Action: None E8 = Maximum number of control steps has been exceeded. Action: Regulate the pressure up to and including step 5. T9 = Super heat warning E9 = Super heat alarm The following alarm messages may appear in the DISCHARGEdisplay: E2 = Pressure sensor discharge defect. Action: Everything off E4 = Temperature sensor discharge defect. Action: None (no control function) E11 = High pressure alarm Action: None E21 = High pressure failure. Action: Everything off E31 = External high pressure failure. Action: Everything off E41 = High temperature alarm. Action: None E51 = High temperature failure. Action: Everything off When an alarm occurs the relevant alarmcode appears in the appropriate display and the LED on the appropriate side switches on. If an external alarm is registered, the appropriate fail LED will lit. By means of the MODE/SELECT key it is possible to see which compressor and/or which condenser has given the alarm. At the same time the LED above the RESET/ALARM key will flash as a reminder that another alarm must be reset by pressing the RESET/ALARM key. If there are more than one alarm then the first alarm to occur will be visible until it is reset, then the second alarm will be visible until it is reset, and so on. If they have all been reset but not resolved then the alarm codes will flash on the display and can be skimmed through with the RESET/ALARM key. In addition it is possible to assign a relay as a general alarm relay; this is normally on and goes off in case of alarm.

22 MC 785SC Client : General Page : 22 of Function flow Operation of the Pband on the suction pressure side (Compressorside): Overview of the function flow for 4compressors for the switching up and down of compressors:

23 MC 785SC Client : General Page : 23 of 32 Overview of the function flow for compressor with 5cylinders: Working of compressor control with unequal steps; At maximum 7 controlsteps can be made. This is f.i. 6 compressors (= 64 steps). When the number of steps is exceeded, the error message E 8' will appear. The controller will then control with the number of steps calculated up til then. It is also possible to use compressors with valve lifting. The number of steps can be calculated as follows: number of steps compr1 * number of steps compr2... etc. Example1: Compr 1: 3 cylinder (33661% = 4 steps) e.g. 1KW Compr 2: 2 cylinder (51% = 3 steps) e.g. 2KW gives: 4 * 3 = 12 steps. Example2: Compr 1: 2 cylinder (51% = 3 steps) Compr 2,3,4,5: (1% = 2 steps) gives: 3 * 2 * 2 * 2 * 2 = 48 steps

24 MC 785SC Client : General Page : 24 of 32 Step Compressor1, 3cylinder model 1kW Compressor2, 2cyl.model 2kW Total cyl. 1cyl. 2cyl. 3cyl. kw cyl. 1cyl. 2cyl. kw kw % % 33% 66% 1 % % 5% 1 % 1 x x 2 x.33 x x.66 x x 1 x x x x.33 x x.66 x x 1 x x x x.33 x x.66 x x 1 x Example1 overview of the control steps with the cooling capacity in percentages ( x=active) Increasing compressors: When two or more steps result in the same capacity the step leading to the switching down of the fewest compressors is first selected. If the steps are then still equal the step with the shortest increase delay is selected. If the steps are then still equal the step with the fewest running hours is selected. If this still does not lead to an unambiguous step then the first step is increased. Decreasing compressors: When two or more steps result in the same capacity the step leading to the switching down of the fewest compressors is selected. If the steps are then still equal the step with the shortest switching down delay is selected. If the steps are then still equal the step with the most running hours is selected. If this still does not lead to an unambiguous step then the first step is increased. If the minimum on and off times are longer than the switching up and down times this can result in an unstable system. When the switching down time is over there must always be a switching down (provided that the minimum ontime is over). Example3: Three compressors (1kW, 2kW, 4kW) run in the stand 11 (step4=3kw) The suction pressure is still too high so the next step is 1 (step5=4kw) Now the suction pressure will fall to the switching down point. If the compressors1 and 2 are still running in their minimum offtime, then the control will still decrease compressor 3. The result of this is that all compressors are now off. they When compressors have to be switched on during the switching down process will always continue to run for their minimum ontime.

25 MC 785SC Client : General Page : 25 of 32 Step Compressor1 on/off 1KW model Compressor2 on/off 2KW model Compressor3 on/off 4KW model Total x=on KW x=on KW x=on KW KW % 1 2 x x x 1 x x x 1 x x 2 x x 1 x 2 x Example3: overview of the control steps with the cooling capacity in percentages (x=active)

26 MC 785SC Client : General Page : 26 of Front view Front of MC 785SC (wall mounting, drawing 1718) Front of MC 785SC (panel mounting, drawing 21842)

27 MC 785SC Client : General Page : 27 of Diagrams of connections Connection diagram for MC 785SC (wall mounting, drawing 1735) Connection diagram for RS485 network

28 MC 785SC Client : General Page : 28 of 32 Connection diagram for MC 785SC (panel mounting drawing 21841)

29 MC 785SC Client : General Page : 29 of 32 Connection diagram for LMSmodules for MC785SC drawing 1822

30 MC 785SC Client : General Page : 3 of 32 Connections LMS 7x RELAYSC MODULE (91.49)

31 MC 785SC Client : General Page : 31 of Dimensions Dimensions of MC785SC panel mounting model drawing 9424

32 MC 785SC Client : General Page : 32 of 32 Dimensions of MC785SC wall mounting drawing