Flowrite EA 599 Series SKD Electronic Valve Actuator 24 Vac Proportional Control

Transcription

1 Flowrite EA 599 Series SKD Electronic Valve Actuator 24 Vac Proportional Control Document No. 55-8P25 EA EA379R Description The Flowrite EA 599 Series SKD Electronic Valve Actuator requires a 24 Vac supply and receives a to Vdc or a 4 to 2 ma control signal to proportionally control a valve. This actuator is designed to work with Flowrite VF 599 Series valve and Siemens Building Technologies, Inc. standard valves with a 3/4-inch (2 mm) stroke. Features Direct-coupled installation requires no special tools or adjustments Visual and electronic stroke indication Application Die-cast aluminum housing anual override Spring return to fail safe position Automatic stroke calibration aintenance-free These electronic actuators are designed to be used with Flowrite VF 599 Series valves and Siemens Building Technologies standard valves with a 3/4-inch (2 mm) stroke in liquid service and steam service applications. Product Number SKD62U (Actuator Prefix Code 274)

2 Document Number 55-8P25 SKD Electronic Valve Actuator 24 Vac Proportional Control Warning/Caution Notations WARNING CAUTION Personal injury/loss of life may occur if a procedure is not performed as specified. Equipment damage, or loss of data may occur if the user does not follow procedure as specified. Specifications Power supply Operating voltage 24 Vac ± 2% Frequency 5/6 Hz Power consumption 7 VA Control signals Control input () Voltage aximum Impedance to Vdc or 4 to 2 ma (DIP switch selectable) to Vdc K ohms 4 to 2 ma; 24 ohm Control input (Z) Resistance to ohms Voltage to.6v Control output (U) Voltage to Vdc Load Impedance >5 ohm Current 4 to 2 ma Load impedance < 5 ohms Function Nominal stroke 3/4-inch (2 mm) Run time with control operation (full stroke) Power stroke, to %; % to % 3 seconds Spring return stroke, to % 5 seconds Nominal Force Stroke Force NC and 3-way upper % 225 lbs. ( N) NO and 3-way by-pass % 258 lbs. (5 N) Agency Certification UL approval UL873 C-UL Certified to Canadian standard C22.2 No CE conformity per the EC directive 89/336/EEC Low voltage directive 73/23/EEC Ambient conditions Ambient temperature 5 F to 22 F (-5 C to 5 C) edia temperature 4 F to 284 F (- C to 4 C) Housing NEA Rating NEA (interior only) See Accessories. iscellaneous Dimensions See Figure 9 Conduit opening /2-inch NPS Weight 7.5 lbs. (3.4 kg) Page 2

3 SKD Electronic Valve Actuator 24 Vac Proportional Control Document Number 55-8P25 Accessories NOTE: Installation instructions are included with each accessory. ASC.6 Auxiliary switch. EA7R Figure. Auxiliary Switch. Sends a signal to indicate the valve is in the % stroke position. Switching point is fixed at the % stroke position. Switching capacity Lowest recommended current 24 Vac 4A resistive 2A inductive ma Packing heating element. EA393R Figure 2. Packing Heating Element. EA87R % Figure 3. Remote Setting Unit. Allows stem to move freely in valves controlling fluids at temperatures below 32 F ( C). Reduces ice crystal formation on the stem which may damage the packing. Operating Voltage Heating Output 2 W 24 Vac FZA2. Remote setting unit. Potentiometer for manual control or remote setting of minimum positions of controlled devices. Suitable for flush panel mounting only. Control Input to Ohms Weather Shield. See Service Kits for replacement UV resistant cable ties. EA853R Figure 4. Weather Shield. Page 3

4 Document Number 55-8P25 SKD Electronic Valve Actuator 24 Vac Proportional Control Service Kits The only field serviceable part is the circuit board. Circuit board replacement Plastic wiring compartment cover anual Override Kit for SKD Ultraviolet (UV) resistant cable ties (pkg. of ) WARNING: This product contains a spring under high compression. Do not attempt to disassemble the actuator. SKD Details ;EA389R ;Figure 5. SKD Details. Legend Pressure cylinder 2 Piston 3 Oscillating pump 4 Return spring 5 Bypass valve 6 Valve stem retainer 7 anual override knob 8 Position indicator Page 4

5 SKD Electronic Valve Actuator 24 Vac Proportional Control Document Number 55-8P25 Operation The actuator accepts a to Vdc or a 4 to 2 ma control signal. The actuator mounted on a valve, produces a stroke proportional to the input signal. When power is turned off or in the event of a power failure, the actuator spring returns the valve to its normal position. Vdc 4 2 ma STROKE EA86R A B EA439R Figure 7. Figure 6. 3/4 in. (2mm) EA387R Figure 8. Valve Stem Travel Indication. ounting and Installation Not allowed with the Weather Shield EA92R Not allowed in any circumstance Figure 9. Acceptable ounting Positions. The vertical position is the recommended position for mounting. Other positions are allowed. When using the Weather Shield for NEA 3R rating, the vertical position is required. See Weather Shield installation instructions and Figure 9. Allow four inches ( mm) around the sides and back of the actuator and eight inches (2 mm) above and to the front of the actuator. See dimensions in Figure 9. Detailed installation instructions for field mounting are shipped with the actuator. Page 5

6 Document Number 55-8P25 SKD Electronic Valve Actuator 24 Vac Proportional Control Start-up Stroke Calibration Check the wiring for proper connections. NOTE: The valve body assembly determines the complete assembly action. To determine the stroke positions % and % in the valve, calibration is required when the valve/actuator are commissioned for the first time. The actuator must be mechanically connected to a valve and must have a 24 Vac power supply. The calibration procedure can be repeated as often as necessary. CAUTION: Before starting calibration, be sure the manual adjuster is set to Automatic to register the actual values. There is a slot on the printed circuit boards of the the actuators. To initiate the calibration procedure, the contacts inside this slot must be short-circuited, for example, with a screwdriver (See Figure ). Automatic calibration proceeds as follows (See Figure ): Actuator runs to the stroke position (), green LED flashes. Actuator then runs to the stroke position (2), green LED flashes. easured values are stored in the EPRO. The actuator now moves to the position defined by control signal or Z (3), and the green LED now glows steadily (normal operation). Throughout this procedure, output U is inactive; meaning, the values only represent actual positions when the green LED stops flashing and remains on continuously. EA66R EA65R Figure. Stroke % 2 3 % Figure. y Table. LED Status. LED Display Function Action ON Normal Operation Automatic operation Green Wait for calibration to be Flashing Stroke calibration In Progress completed (LED stops flashing) Faulty stroke calibration - Check mounting ON - Restart stroke calibration (by short-circuiting calibration slot) Red Internal Error - Replace electronics Flashing Inner valve jammed Check the valve OFF No power supply -Check mains Faulty electronics -Replace electronics Page 6

7 SKD Electronic Valve Actuator 24 Vac Proportional Control Document Number 55-8P25 Start-up continued Override Control The override control input (Z) has three modes of operation: No Function G Stroke G % Hmax Override with... G Stroke G % U Z Hmin Z-Contact not Wired Valve Stroke Follows Control Signal Actuator Fully Extended U Z R % 5 9 R [] Z-Contact Connected to Via Resistor R Linear or Equal-Percentage Characteristic Starting Position at 5 / End Position at 9 -Input has No Effect Actuator Fully Retracted G Stroke G Stroke G % Vmax G % Vmax EA64R U Z % Z-Contact Connected Directly to G -Input has No Effect U Z % Z-Contact Connected Directly to G -Input has No Effect The Z-modes have a "direct acting" factory setting. Page 7

8 Document Number 55-8P25 SKD Electronic Valve Actuator 24 Vac Proportional Control Start-up continued Connection Terminals Stroke Calibration G G U Z AC 24V G 5/6Hz... V G mA Chm Status Calib. Calib. Status Green Red OK Calib. Error Valve Jam LED Status Indication DIP Switches Functions See Below EA68R 2 Figure 2. SKD Electronic Features. DIP Switches (Left to right) Selection of Control Signal 2 Selection of Flow Characteristic ON 4 to 2 ma odified* OFF Factory Setting to Vdc Default *Changing the default setting will modify an equal percentage valve to a linear flow characteristic. When set to default, the flow characteristic is determined by the valve body. Page 8

9 SKD Electronic Valve Actuator 24 Vac Proportional Control Document Number 55-8P25 Start-up, continued Normally Closed Valve Normally Open Valve Three Way Valve Actuator pressure cylinder moves: Outward ( to ): Valve opens. Inward ( to ): Valve closes. Actuator pressure cylinder moves: Outward ( to ): Valve closes. Inward ( to ): Valve opens. Actuator pressure cylinder moves Outward ( to ): Valve opens between port NC and C. Inward ( to ): Valve opens between ports NO and C. The measuring voltage at terminal U provides valve stem position feedback to an indicating instrument or building automation system. anual Operation >3x36 << AUTO >> EA8R << AN >> << AUTO >> Figure 3. The anual Setting Knob in anual and Automatic Position. - Turn the manual setting knob clockwise for manual operation. - A red indicator becomes visible as you begin to crank. Each complete revolution (36 ) is equal to 3/32-inch (2.5 mm) stroke. - If a signal is sent to the actuator while it is in manual operation, the actuator will move but the control will not be accurate. - The valve cannot be commanded to its % position while in manual operation. Automatic operation For automatic operation the manual override knob must be in the fully closed position. Turn the manual override knob counterclockwise until the red indicator disappears. Page 9

10 AC 24 V Document Number 55-8P25 SKD Electronic Valve Actuator 24 Vac Proportional Control Wiring Wiring Diagram Do not use autotransformers. Use earth ground isolating step-down Class 2 power supplies. Determine supply transformer rating by summing total VA of all actuators used. The maximum rating for Class 2 step-down transformer is VA. Since SKD62U actuator requires 2 VA, a maximum of four actuators can be powered by one transformer (8% of transformer VA). Operating more than four SKD62U actuators requires additional transformers or separate VA power supplies. The position output signal U will switch from to Vdc to 4 to 2 ma when a 4 to 2 ma input signal is selected and used on the terminal. B G (SP) F B 2 3 G B N G G U Z EA74R G G (SN) B Sensor F Temperature Limiter N Controller Actuator Figure 4. Connecting Terminals. 24 Vac G System Potential (SP) G System Neutral (SN) Control input to Vdc or 4 to 2 ma (DIP switch selectable) easuring neutral U Position indication to Vdc or 4 to 2 ma, See Table 2. Z Override control Table 2. Receiving Impedance Actuator input signal low (<5 Ohm) high (>k Ohm) to Vdc to 2 ma to Vdc 4 to 2 ma 4 to 2 ma 2 to Vdc Page

11 SKD Electronic Valve Actuator 24 Vac Proportional Control Document Number 55-8P25 Wiring Diagrams, continued 3 G (SP) EA85R 4 C 5 24V~ 2W GO (SN) 2 EA84R EA83R2 Z Figure 5. Auxiliary Switch ASC.6. Figure 6. Packing Heating Element Figure 7. Remote Setting Unit FZA2.. Troubleshooting Check that the wires are connected correctly and attached securely. Check for adequate power supply. Check that the actuator is set for automatic operation. See the Start-Up section. Dimensions -/4 (285) 8-3/6 (224) 4-3/6 (22) 4-3/6 (22) 2-9/6 (65) 9-3/8 (232) 4-/2 (4) -5/6 (49) 2-7/8 (327) 3/4 (9) EA854R 5 (26) Figure 8. Dimensions of Weather Shield in Inches (illimeters). Page

12 Document Number 55-8P25 SKD Electronic Valve Actuator 24 Vac Proportional Control Dimensions, Continued NOTE: The top knockout position should be used when installing the Weather Shield. 4-3/4 (2) 2-/2 (64) 4-/8 (5) KNOCKOUT FOR STANDARD /2" CONDUIT CONNECTOR Ø5 (27) 5-5/8 (43) -3/6 (3) 4-7/8 (23) EA385R 2-5/8 (66) Ø-3/4 (44) Ø2-9/6 (65) Figure 9. Dimensions of SKD Actuator. Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Flowrite is a trademark of Other product or company names mentioned herein may be the trademarks of their respective owners. 23 Deerfield Parkway Buffalo Grove, IL U.S.A. our feedback is important to us. If you have comments about this document, please send them to technical.editor@siemens.com Document No. 55-8P25 Printed in the U.S.A. Page 2