AIR VOLUME TRANSMITTER / CONTROLLER IML

Transcription

1 en AIR VOLUME TRANSMITTER / CONTROLLER IML IML air volume transmitter is designed for detecting and controlling air volumes in air handling units and room spaces. Air volumes are calculated by using the differential pressure resulting from the air flow in the duct or in the fan. At least 15 Pa pressure difference is needed for reliable measurement result. The air volume can be measured from: 1. Fans with flow measuring joints. The air flow volume formulas are selectable for following fan manufacturers: Fläkt Woods, Rosenberg, Comefri, Ziehl-Abegg, ebm-papst, Nicotra and Gebhardt. 2. Using traditional air flow sensors like pitot tube, PP air flow probe or iris damper in the ventilation duct. In this case the air flow volume is counted by using the universal formula. Find more information about air volume measuring from the IML user guide. The display shows alternately either air volume or differential pressure or the desired variable can be locked on the display. The variable unit can be selected in the menu during commissioning. The effect of the fast changing pressures resulting from process problems can be eliminated by changing the time constant. The measurement accuracy is guaranteed by using the automatic zero point calibration. With the internal controller functions you can implement variable air volume control or differential pressure control. Variable air volume (VAV) control The VAV control set point can be set in three different ways: By an external 0 10 V signal During commissioning in the menu Via Modbus (IML-M) The internal P/PI-controller controls the 0 10 V output by using the set point and the detected air volume. The 0 10 V controlled damper connected to the controller output keeps the air volume in the set value. By using two IML transmitters and two 0 10 V controlled dampers it is possible to keep the incoming and exhausted air volume in balance. The output signal of the exhausted air volume (output 1) is then used as a set point for the IML that controls incoming air volume (input 1). For balancing the air volumes, there is a balancing coefficient ( %) in the menu. A model IML-M with Modbus communication is available. The IML-M measurements can be read and the settings can be made via Modbus. Technical data Supply 24 Vac/dc ( V) Power consumption 24 Vdc < 1.0 VA Range selectable at commissioning 24 Vac < 1.5 VA Pa * Pa Pa Pa Air volume range selectable from menu Output 1: air volume Output 2: differential pressure or Vdc, < 2 ma Vdc, < 2 ma controller output Input 1: air volume set point Vdc Accuracy (differential pressure) ±1 Pa + ±1% of reading (25 C) Temperature drift of the range (typ.) < 0,1 % / K Output time constant s, 8 s * Balancing coefficient %, 100 %* Operating temperature C Maximum allowed overpressure 25 kpa Housing Pressure connection IP54 with Ø 6/4 mm hoses * = Factory setting Wiring: 1 24 Vac/dc 2 0 V 3 Output 1: Air volume, Vdc 4 Output 2: Differential pressure or controller output, Vdc 5 Input 1: External set point, Vdc 6 RS-485 A+ (Modbus, IML-M) 7 RS-485 B- (Modbus, IML-M) 8 RS-485 GND (Modbus, IML-M) Ordering guide: Model Product Description number IML air volume transmitter / controller IML-M air volume transmitter / controller Modbus connection Products fulfil the requirements of directive 2004/108/EC and are in accordance with the standards EN : 2001 (Emission) and EN : 2001 (Immunity). Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

2 USER GUIDE IML V ( ) 1 (6) This user guide is for devices with the software version or newer. AIR VOLUME MEASURING The air volume can be measured from: 1. Fans with flow measuring joints. 2. Using traditional air flow sensors like pitot tube, PP air flow probe or iris damper in the ventilation duct. The flow measurement accuracy changes according to the measured pressure difference (see the following figure). The measurement inaccuracy is V error (25 C) + error of the probe. To ensure reliable result, the measurement should be arranged so that the measured pressure difference is at least 15 Pa. With PP probes, the adequate pressure difference is achieved when the air velocity is over 5 m/s. With iris damper, the pressure difference can be calculated by using the formula 2 Q P, where k Q = smallest designed air flow and k = iris damper k value. AIR VOLUME CONTROL Air volumes are regulated by V controlled dampers. Parameters to be set: Defined maximum volume (= nominal volume) Vnom (Vnom = Out1 max) Vmin and corresponding SPmin control signal (percents from Vnom value) Vmax and corresponding SPmax control signal (percents from Vnom value) External set point < 0,3 V always CLOSES the damper External set point > 9,7 V always OPENS the damper (air volume = Vnom) Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

3 USER GUIDE IML 2 (6) Example application (supply/exhaust VAV control): WIRING Device wiring and commissioning can only be carried out by qualified professionals. Always make the wirings while the power is switched off Vac/dc 2 0 V 3 Output 1: Air volume, Vdc 4 Output 2: Differential pressure or controller output, Vdc 5 Input 1: External set point, Vdc 6 RS-485 A+ (Modbus, IML-M) 7 RS-485 B- (Modbus, IML-M) 8 RS-485 GND (Modbus, IML-M) COMMISSIONING NOTE: All the settings and parameters must be checked during the commissioning. This way you can ensure the correct function in the selected application. The settings can be configured through the device menu. Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

4 USER GUIDE IML 3 (6) MENU You can proceed in the menu by touching the M and OK buttons. The values can be changed with the + and - buttons. The setting is confirmed with the OK button. The following menu structure contains the factory settings. The settings are saved when exiting the menu. The device returns to the user mode from the main menu, if the buttons are not pressed within 30 seconds. Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

5 USER GUIDE IML 4 (6) USER MODE As a default, the air volume and differential pressure view scrolls on the display in turns of three seconds. Air volume unit can be selected with the Unit parameter. The air volume or differential pressure view can be selected to view continuously by pressing OK button. You resume to the scrolling view by pressing the OK button again. Set point The internal set point can be set with the + and - buttons. The set point is given as percentage of the selected range (parameters =10V (flow control) and Pa (pressure control)). The setting is confirmed with the OK button. If external set point or set point via Modbus is selected (SP parameter is SPEXT or SPMOD), the effective set point can be viewed by pressing the + or - button. The set point is displayed as percentage of the selected range. RESETTING TO THE FACTORY SETTINGS The device can be reset to the factory settings by simultaneously pressing the M, + and OK buttons for 5 seconds. The device must be in the user mode when resetting the settings. Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

6 USER GUIDE IML 5 (6) MODBUS The parameter memory durability allows at least writing cycles. Bus properties Protocol RS-485 Modbus RTU Bus speed 9600/19200/38400/56800 bit/s Data bits 8 Parity none/odd/even Stop bits 1 Network size up to 247 devices per segment Modbus function codes The device supports the following Modbus function codes. 0x01 0x02 0x03 0x04 0x05 0x06 0x0F 0x10 0x17 Read coils Read discrete inputs Read holding registers Read input registers Write single coil Write single register Write multiple coils Write multiple registers Read/write multiple registers Modbus registers Coils Register Parameter Description Data Type Value Range Default 1 Control mode Bit 0 = P = PI 2 Actuator direction Bit = Direct 1 = Reversed 3 Output 1 Modbus over drive enable Bit = Off, 1 = On 0 4 Output 2 Modbus over drive enable Bit = Off, 1 = On 0 Input registers Register Parameter Description Data Type Value Range Pressure Signed Pa Flow, selected unit m 3 /s Signed ,0 50,0 m 3 /s Flow, selected unit m 3 /h Signed m 3 /h Flow, selected unit l/s Signed l/s External set point (0...10V) Signed ,0 V Internal set point Signed % Holding registers Register Parameter Description Data Type Value Range Default Formula Signed = Uniform 1 = Fläkt Woods 2 = Rosenberg 3 = Comefri 4 = Ziehl 5 = ebm-papst 6 = Nicotra 7 = Gebhardt k-value integer Signed k-value decimal Signed ,0 0, Unit Signed = m 3 /s 1 = m 3 /h 2 = l/s Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

7 USER GUIDE IML 6 (6) Register Parameter Description Data Type Value Range Default Out 1 scale, Vnom (unit above) Signed Pressure measurement range Signed = 1000 Pa 1 = 2000 Pa 2 = 5000 Pa 3 = 7000 Pa Response time (T 63 ) Signed s Controller Signed = Off 1 = Volume 2 = Pressure 3 = VAV Proportional band (Xp) Signed , ,0 % Integral time Signed s Set point Signed = ext V 1 = Modbus 2 = Internal (menu) Modbus set point *) Signed ,0 % External set point scale (effective if = 3 VAV) Signed % Vmin (effective if = 3 VAV) Signed % Vmax (effective if = 3 VAV) Signed % Spmin (effective if = 3 VAV) Signed ,0 V Spmax (effective if = 3 VAV) Signed ,0...10,0 V Output 1 Modbus over drive *) Signed ,0 V Output 2 Modbus over drive *) Signed ,0 V Hysteresis Signed % 2 *) NOTE: Values, set via Modbus, will be lost during a power failure and must be updated after power is back. Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

8 en AIR VOLUME PROBES PP-PK AND PP-SK The PP air flow volume probes are designed for air flow volume measurement together with the IML air volume transmitter, for example. PP probe is also easy to install to the existing ducts. The probe operates on the pitot tube principle and measures the total (P tot ) and static (P stat ) pressure components of airflow according to the following figure. Air flow direction The measurement is done over several measuring points inside the probe. The number of measurement points depends on the duct size and shape. The IML can determine the average air flow volume on the basis of the measurements. The measuring profile shape makes it possible to make accurate measurements from 1.0 m/s air speeds. Technical data Operating temperature 5 95 C Accuracy (air speed > 1 m/s) ±2 % Connection with Ø 6/4 mm hoses The following table illustrates the needed number (1...4) of the probes with rectangular ducts. With round ducts, one probe is always enough. Duct height mm mm mm mm Number of PP-SK probes Ordering guide, round duct air flow volume probes (PP-PK): Duct diameter 100 mm 125 mm 160 mm 200 mm 250 mm Model PP-PK R100 PP-PK R125 PP-PK R160 PP-PK R200 PP-PK R250 Product number Duct diameter 315 mm 400 mm 500 mm 700 mm Model PP-PK R315 PP-PK R400 PP-PK R500 PP-PK R700 Product number Ordering guide, rectangular duct air flow volume probes (PP-SK): Duct width 200 mm 250 mm 300 mm 350 mm 400 mm 450 mm 500 mm Model PP-SK L200 PP-SK L250 PP-SK L300 PP-SK L350 PP-SK L400 PP-SK L450 PP-SK L500 Product number Duct width 550 mm 600 mm 650 mm 700 mm 750 mm 800 mm 850 mm Model PP-SK L550 PP-SK L600 PP-SK L650 PP-SK L700 PP-SK L750 PP-SK L800 PP-SK L850 Product number Duct width 900 mm 950 mm 1000 mm 1050 mm 1100 mm 1150 mm 1200 mm Model PP-SK L900 PP-SK L950 PP-SK L1000 PP-SK L1050 PP-SK L1100 PP-SK L1150 PP-SK L1200 Product number Products fulfil the requirements of directive 2004/108/EC and are in accordance with the standards EN : 2001 (Emission) and EN : 2001 (Immunity). Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

9 FITTING INSTRUCTION PP-PK and PP-SK V1.2 ( ) 1 (5) 1. Select a suitable installation position. The following figure illustrates minimum duct discontinuity point distances. α < 15 Round ducts: D = duct diameter Rectangular ducts: D = 2 x (H x B) / (H + B) H = duct height and B = duct width. Install the probe diagonally in the duct. This equalises irregular air approach effect. Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

10 FITTING INSTRUCTION PP-PK and PP-SK 2 (5) Install the probes to a rectangular duct according to the following figure. B C H = duct height B = duct width A = max. 150 mm C = max. 300 mm Duct height (H) Number of probes mm mm mm mm 4 2. Drill a Ø25 mm hole to the ventilation duct. 3. If you are installing the probe to over 400 mm wide duct, drill a Ø6 mm hole to the opposite side. 4. Fit the probe to the duct with two screws. Make sure that the duct air flow direction corresponds with the arrow marked on the probe. 5. If you are installing the probe to over 400 mm wide duct, fit the probe other end with a washer and nut. 6. Connect the probe to a measuring device with Ø6/4 mm hoses. Connect the probes in parallel, if there is more than one probe in the same installation position. Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

11 FITTING INSTRUCTION PP-PK and PP-SK 3 (5) You can count the duct air volume flow by using the following equation: Q K v P, where Q = air volume flow (l/s) K v = K v value (l/s/pa) P = differential pressure measured by the probe (Pa) The K v value is marked to the PP-PK probes. PP-SK probe K v values are presented in the following table. K v value can be calculated by the following formula: K v [l/s] = 921 x B[m] x (H[m] 0,025[m] x n), where H and B are in meters. The K v value is needed when you connect the PP probe to the IML transmitter, for example. Duct height (H) Number of probes Duct width (W) K v (l/s/pa) ,0 28,8 34,5 40,3 46,0 51,8 57,5 63,3 69,1 74,8 80,6 86,3 92, ,1 41,4 49,7 58,0 66,3 74,6 82,9 88,6 99, ,4 51,8 62,1 72,5 82,9 93, ,0 58,7 70,4 82, ,2 69,1 82,9 96, ,4 81,7 98, ,7 92, , Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

12 FITTING INSTRUCTION PP-PK and PP-SK 4 (5) Duct height (H) Number of probes Duct width (W) K v (l/s/pa) , Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi

13 FITTING INSTRUCTION PP-PK and PP-SK 5 (5) The following table illustrates the PP-PK probe differential pressure measurement ( P) relation to the volume flow (Q). Duct diameter K v 5,60 9,17 15,62 25,06 38,43 62,85 80,83 103,76 P (Pa) Q (l/s) Produal Oy Keltakalliontie 18, Kotka FINLAND Tel: / Fax: info@produal.fi