Electro-hydraulic actuators for valves
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1 4 56 Electro-hydraulic actuators for valves with a 2 mm stroke SKD32.. SKD82.. SKD62.. SKD6 SKD32.. Operating voltage AC 23 V, 3-position control signal SKD82.. Operating voltage AC 24 V, 3-position control signal SKD6.. Operating voltage AC 24 V, control signal DC V, 4 2 ma or... Ω SKD6.. Choice of flow characteristic, position feedback, stroke calibration, LED status indication, override control SKD62UA with functions choice of direction of operation, stroke limit control, sequence control with adjustable start point and operating range, operation of frost protection monitors QAF2.. and QAF6.. Positioning force N Actuator versions with or without spring-return function For direct mounting on valves; no adjustments required Manual adjuster and position indicator Optional functions with auxiliary switches, potentiometer, stem heater and mechanical stroke inverter SKD..U are UL-approved Use For the operation of Siemens 2-port and 3-port valves, types VVF.., VVG.., VXF.. and VXG.. with a 2 mm stroke as control and safety shut-off valves in heating, ventilation and air conditioning systems. CMN456E Siemens Building Technologies HVAC Products
2 Types Type Standard electronics SKD32.5 SKD32.5 SKD32.2 SKD82.5 SKD82.5U * SKD82.5 SKD82.5U * SKD62 SKD62U * SKD6 Enhanced electronics SKD62UA * Operating voltage AC 23 V AC 24 V Positioning signal 3-position Spring-return Positioning time Function Time Opening Closing yes yes 8 s 8 s DC... V, ma, yes 5 s or... Ω yes 5 s 2 s 2 s 3 s s 2 s 2 s 3 s 5 s Enhanced functions yes ) ) Direction of operation, stroke limit control, sequence control, signal addition * UL-approved versions Accessories Ordering Delivery Spare parts Type Description For actuator Mounting location ASC.6 Auxiliary switch SKD6.. ASC9.3 Dual auxiliary switches ASZ7.3 Potentiometer Ω SKD32.. ASZ7.3 Potentiometer 35 Ω SKD82.. ASZ7.32 Potentiometer 2 Ω x ASC.6 or x ASC9.3 or x ASZ7.3 or x ASZ7.3 or x ASZ7.32 ASZ6.5 Stem heater AC 24 V x ASZ6.5 SKD.. ASK5 Mechanical stroke inverter x ASK5 When ordering please specify the quantity, product name and type code. Example: actuator, type SKD32.5 and potentiometer, 35 Ω, type ASZ7.3 The actuator, valve and accessories are supplied in separate packaging and not assembled prior to delivery. See overview, section «Replacement parts», page 5. Equipment combinations Valve type DN PN-class k vs [m 3 /h] data sheet Two-port valves VV... (control valves or safety shut-off valves)): VVF2.. Flange VVF3.. Flange VVF4.. Flange VVF4.. Flange VVG4.. Threaded VVF52.. Flange VVF6.. Flange Three-port valves VX... (control valves for «mixing» and«distribution»): VXF2.. Flange VXF3.. Flange VXF4.. Flange VXF4.. Flange VXG4.. Threaded VXF6.. Flange /6 For admissible differential pressures Δp max and closing pressures Δp s, refer to the relevant valve data sheets.
3 Note Third-party valves with strokes between 6 2 mm can be motorized, provided they are «closed with the de-energized» fail-safe mechanism and provided that the necessary mechanical coupling is available. The signal must be routed via an additional freely-adjustable end switch (ASC9.3) to limit the stroke. We recommend that you contact your local Siemens office for the necessary information. Technology Principle of electro-hydraulic actuators 4567Z 4567Z Manual adjuster 2 Pressure cylinder 3 Suction chamber 4 Return spring 5 Solenoid valve 6 Hydraulic pump 7 Piston 8 Pressure chamber 9 Position indicator ( to ) Coupling Valve stem 2 Plug Valve closed Valve open Opening the valve Closing the valve Manual operation mode Note: Controller in manual operation Automatic mode Minimal volumetric flow The hydraulic pump (6) forces oil from the suction chamber (3) to the pressure chamber (8) and thereby moving the pressure cylinder (2) downwards. The valve stem () retracts and the valve opens. Simultaneously the return spring (4) is compressed. Activating the solenoid valve (5) allows the oil in the pressure chamber to flow back into the suction chamber. The compressed return spring moves the pressure cylinder upwards. The valve stem extends and the valve closes Turning the manual adjuster () clockwise moves the pressure cylinder downwards and opens the valve. Simultaneously the return spring is compressed. In the manual operation mode the control signals and Z can further open the valve but cannot move to the «%» stroke position of the valve. To retain the manually set position, switch off the power supply or disconnect the control signals and Z. The red indicator marked «MAN» is visible. When setting the controller for a longer time period to manual operation, we recommend adjusting the actuator with the manual adjuster to the desired position. This guarantees that the actuator remains in this position for that time period. Attention: Do not forget to switch back to automatic operation after the controller is set back to automatic control. Turn the manual adjuster counterclockwise to the end stop. The pressure cylinder moves upward to the «%» stroke position of the valve. The red indicator marked «MAN» is no longer visible. The actuator can manually be adjusted to a stroke position > allowing its use in applications requiring constantly a minimal volumetric flow. 3/6
4 Spring-return facility SKD32../SKD position control signal The SKD32.5, SKD32.2, SKD82.5U.. and SKD62.. actuators, which feature a spring-return function, incorporate an additional solenoid valve which opens if the control signal or power fails. The return spring causes the actuator to move to the stroke position and closes the valve in accordance with the safety requirements set out in DIN The valve is controlled by a 3-position signal either via terminals or 2 and generates the desired stroke by means of above described principle of operation. Voltage on piston extends valve opens Voltage on 2 piston retracts valve closes No voltage on and 2 piston / valve stem remain in the respective position SKD62.., SKD6 control signal DC... V and/or DC ma, Ω Frost protection monitor Frost protection thermostat The valve is either controlled via terminal or override control Z. The positioning signal generates the desired stroke by means of above described principle of operation. Signal increasing: piston extends valve opens Signal decreasing: piston retracts valve closes Signal constant: piston / valve stem remain in the respective position Override control Z see description of override control input, page 7 A frost protection thermostat can be connected to the SKD6.. actuator. The added signals from the QAF2.. and QAF6.. require the use of SKD62UA actuators. Notes on special programming of the electronics are described under «Enhanced electronics» on page 5. «Connection diagrams» for operation with frost protection thermostat or frost protection monitor refer to page 3. Standard electronics SKD62.., SKD6 4567Z3 Calib. G G AC 24V 5/6Hz M U...V 4...2mA Z G G Ohm Calib. Status ON 2 Status green red ok calib. error valve jam Connection terminals 2 Mode DIL switches 3 LED status indication 4 Slot for calibration DIL switches SKD62.., SKD6 Positioning signal Position feedback U Flow characteristic ON ON Z5 DC 4 2 ma ON Z7 lin = linear OFF *) ON Z6 *) Factory setting: All switches OFF DC V ON Z8 Relationship between control signal and volumetric flow log = equal percentage V V V 4 lin log V 2 ma 4567Z4 4/6
5 Enhanced electronics SKD62UA 638 Calib. G G M U Z AC 24V G 5/6Hz...V G 4...2mA Ohm Calib. Status Status green red ok calib. error valve jam 2 Connection terminals 2 DIL switches 3 LED status indication 4 Stroke calibration 5 Rotary switch Up (factory setting ) 6 Rotary switch Lo DIL switches SKD62UA Direction of operation Sequence control or stroke limit control Control signal Position feedback U Flow characteristic ON reverseacting Sequence control Signal addition QAF2../QAF6.. DC ma lin = linear OFF * directacting Stroke limit control DC... V log = equal percentage * Factory settings: all switches OFF Relationship between control signal and volumetric flow V V V 4 lin log V 2 ma 4567Z4 Selection of direction of operation SKD62UA With normally-closed valves, «direct-acting» means that with a signal input of V, the valve closes (applies to all Siemens valves listed under «equipment combinations» on page 2) With normally-open valves, «direct-acting» means that with a signal input of V, the valve is open. Direct acting Reverse-acting Input DC... V DC ma... Ω ( V) Input ( V) DC... V DC ma... Ω Stroke Direct V 4 ma Ω Reverse-acting V 2 ma Ω Note The mechanical spring-return function is not affected by the direction of operation selected. 5/6
6 Stroke limit control and sequence control SKD62UA Setting the stroke limit control The rotary switches LO and UP can be used to apply an upper and lower limit to the stroke in increments of 3%, up to a maximum of 45% LO % Position of LO Lower stroke limit Position of UP % y UP Upper stroke limit Setting the sequence control The rotary switches LO and UP can be used to determine the starting point or the operating range of a sequence V UP Position of LO LO... 5 V Starting point for sequence control Position of UP y Operating range of sequence control V V 3 % 97 % V V * 2 6 % 2 94 % 2 2 V 2 V ** 3 9 % 3 9 % 3 3 V 3 3 V *** 4 2 % 4 88 % 4 4 V 4 4 V 5 5 % 5 85 % 5 5 V 5 5 V 6 8 % 6 82 % 6 6 V 6 6 V 7 2 % 7 79 % 7 7 V 7 7 V 8 24 % 8 76 % 8 8 V 8 8 V 9 27 % 9 73 % 9 9 V 9 9 V A 3 A 7 A V A V B 33 % B 67 % B V B V C 36 % C 64 % C 2 V C 2 V D 39 % D 6 % D 3 V D 3 V E 42 % E 58 % E 4 V E 4 V F 45 % F 55 % F 5 V F 5 V * Operating range of QAF2.. (see below) ** Operating range of QAF6.. (see below) *** The smallest adjustment is 3 V; control with 3 V is only possible via. Stroke control with QAF2.. / QAF6.. signal addition SKD62UA only Setting the signal addition The operating range of the frost protection monitor (QAF2.. or QAF6..) can be defined with rotary switches LO and UP. Position of LO Sequence control start point Position of UP QAF2.. / QAF6.. operating range QAF2.. 2 QAF6.. Calibration SKD62.., SKD6 In order to determine the stroke positions and in the valve, calibration is required on initial commissioning: Prerequisites Mechanical coupling of the actuator SKD6.. with a Siemens valve Actuator must be in «Automatic operation» enabling stroke calibration to capture the effective and values AC 24 V power supply Housing cover removed Calibration. Short-circuit contacts in calibration slot (e.g. with a screwdriver) 2. Actuator moves to stroke position () (valve closed) 3. Actuator moves to stroke position (2) (valve open) 4. Measured values are stored % Stroke 24 green LED flashes; position feedback U inactive Z9 Normal operation 5. Actuator moves to the position (3) as indicated by signals or Z % green LED is lit permanently; position feedback U active, the values correspond to the actual positions t A lit red LED indicates a calibration error. The calibration can be repeated any number of times. 6/6
7 Indication of operating state SKD62.., SKD6 The LED status indication indicates operational status with dual-colored LED and is visible with removed cover. LED Indication Function Remarks, troubleshooting Green Lit Normal operation Automatic operation; everything o.k. Red Flashing Calibration in progress Wait until calibration is finished (LED stops flashing, green or red LED will be lit) Lit Faulty stroke calibration Check mounting Restart stroke calibration (by short-circuiting calibration slot) Internal error Replace electronics Flashing Inner valve jammed Check valve Both Dark No power supply Electronics faulty Check mains network, check wiring Replace electronics As a general rule, the LED can assume only the states shown above (continuously red or green, flashing red or green, or off). Override control input Z SKD62.., SKD6 Override control input can be operated in following different modes of operation Z-mode no function fully open closed override with Ω Signal addition SKD62UA only Transfer Connections linear or equalpercentage linear or equalpercentage linear or equalpercentage Z-contact not connected Valve stroke follows -input Z-contact connected directly to G -input has no effect Z-contact connected directly to G -input has no effect Z-contact connected to M via resistor R Starting position at 5 Ω / end position at 9 Ω -input has no effect Z-contact is connected to R of the frost protection monitor QAF2.. or QAF6.. Valve stroke follows signals and R(Z) Note Shown operation modes are based on the factory setting «direct acting» -input has no effect in Z-mode. Accessories SKD.. ASZ6.5 stem heater 825 for media below C; mount between valve and actuator 7/6
8 SKD32.., SKD82.. ASC9.3 double auxiliary switch ASZ7.3.. potentiometer ASK5 stroke inverter 456Z Z adjustable switching points ASZ7.3: Ω ASZ7.3: 35 Ω ASZ7.32: 2 Ω actuator stroke corresponds to valve stroke; mount between valve and actuator SKD62.., SKD6 ASC.6 auxiliary switch Z8 switching point 5 % stroke See section «Technical data» on page for more information. Engineering notes Conduct the electrical connections in accordance with local regulations on electrical installations as well as the internal or connection diagrams. Caution Safety regulations and restrictions designed to ensure the safety of people and property must be observed at all times! Caution For media below C the ASZ6.5 stem heater is required to keep the valve from freezing. For safety reasons the stem heater is designed for an operating voltage of AC 24 V / 3 W. For this case, do not insulate the actuator bracket and the valve stem, as air circulation must be ensured. Do not touch the hot parts without prior protective measures to avoid burns. Non-observance of the above may result in accidents and fires! Recommendation: Above 4 C insulating the valves is strictly recommended. 4567Z Observe admissible temperatures, refer to «Use» on page and «Technical data» on page. If an auxiliary switch is required, its switching point should be indicated on the plant schematic. Every actuator must be driven by a dedicated controller (refer to «Connection diagrams», page 3). 8/6
9 Mounting instructions Mounting Instruction for fitting the actuator to the valve are by packed in the actuator packaging. The instructions for accessories are enclosed with the accessories themselves. Orientation Accessories Installation instructions Accessory Mounting instructions ASC.6 G ASZ6.5 M ASC9.3 G ASK5 M SKD ASZ SKD M Z Commissioning notes When commissioning the system, check the wiring and functions, and set any auxiliary switches and potentiometers as necessary, or check the existing settings. Coupling fully retracted stroke = % Coupling fully extended stroke = 456Z2 456Z3 The manual adjuster must be rotated counterclockwise to the end stop, i.e. until the red indicator marked «MAN» is no longer visible. This causes the Siemens valves, types VVF.., VVG.., VXF.. and VXG.. to close (stroke = %). Manual operation 33a Automatic operation 33b «MAN» «AUTO» Maintenance notes The SKD.. actuators are maintenance-free. When servicing the actuator: Switch off pump of the hydronic loop Interrupt the power supply to the actuator Close the main shutoff valves in the system Release pressure in the pipes and allow them to cool down completely If necessary, disconnect electrical connections from the terminals The actuator must be correctly fitted to the valve before recommissioning. Recommendation SKD6..: trigger stroke calibration. 9/6
10 Repair «Replacement parts», see page 5. Disposal The device contains electrical and electronic components and must not be disposed of together with domestic waste. This applies in particular to the PCB. Legislation may demand special handling of certain components, or it may be sensible from an ecological point of view. Current local legislation must be observed. Warranty The technical data relating to specific applications are valid only in conjunction with the valves listed in this Data Sheet under «Equipment combinations», page 2. The use of the actuators in conjunction with third-party valves invalidates all claims under Siemens Switzerland Ltd / HVAC Products warranty. Technical data Power supply /6 Operating voltage Voltage tolerance Frequency Max. Power consumption At 5 Hz SKD32.. SKD82.. SKD6.. AC 23 V AC 24 V AC 24 V ± 5 % ± 2 2 / +3 SELV / PELV 5 or 6 Hz SKD32.2: 2 VA / 3 W SKD32.5: 6 VA / W SKD32.5: 2 VA, 3 W SKD82.5,..5U 3 VA / 8 W SKD82.5,..5U 8 VA, W 7 VA / 2 W External supply cable fuse min..5 A, slow max..6 A, slow min. A, slow max. A, slow Signal inputs Control signal DC... V, 3-position DC ma or... Ω Terminal Voltage DC V Input impedance kω Current DC 4 2 ma Input impedance 24 Ω Signal resolution < % Hysteresis % Terminal Z Resistor Ω Override control Z not connected No function, priority terminal Z connected directly to G max. stroke Z connected directly to G min. stroke Z connected to M via... Ω stroke proportional to R Position Terminal U voltage DC...9,8 V ±2 % feedback load impedance > kω current DC 4...9,6 ma ±2 % load impedance < 5 Ω Operating data Positioning time at 5 Hz opening SKD s SKD s 3 s SKD s Closing SKD s SKD s 5 s SKD32.2 s Spring-return time (closing) SKD s SKD s SKD s SKD s SKD32.5 SKD82.5 SKD6
11 SKD32.. SKD82.. SKD6.. Positioning force N Nominal stroke 2 mm Max. permissible medium temperature C < C: requires stem heater ASZ6.5 Electrical Cable entry 4 x M2 ( 2.5 mm) connections..u With knockouts for standard ½" conduit connectors ( 2.5 mm) Norms and standards CE-conformity EMC-directive 24/8/EC Immunity EN Industrial Emission EN Residential Low voltage directive 26/95/EC Electrical safety EN 673- Product standards for EN automatic electric controls Protection standard I III EN 673 Housing protection standard Upright to horizontal IP54 to EN 6529 Conform with UL standards SKD82..U UL 873 SKD62U, SKD62UA UL873 C-tick N474 N474 Environmental compatibility ISO 4 (Environment) ISO 9 (Quality) SN 3635 (Environmentally compatible products) RL 22/95/EG (RoHS) Dimensions / Dimensions refer to «Dimensions», page 4 weight Weight SKD32.., SKD82.., SKD kg SKD82..U, SKD6..U, SKD6..UA 3.85 kg ASK5 stroke inverter. kg Materials Actuator housing, bracket Die-cast aluminum Housing box and manual adjuster Plastic Accessories SKD32.., SKD82.. SKD6.. ASC.6 Auxiliary switch Switching capacity AC 24 V, ma...4 A resistive, 2 A inductive ASC9.3 Switching capacity per AC 25 V, 6 A resistive, 2.5 A inductive double auxiliary auxiliary switch switch ASZ7.3 Potentiometer ASZ6.5 stem heater Change in overall resistance ASZ7.3 Ω of potentiometer at nominal ASZ Ω stroke ASZ Ω Operating voltage AC 24 V ± 2 Power consumption 3 VA /6
12 SKD62UA enhanced functions Direction of operation Direct-acting, reverse-acting DC... V / DC... V DC ma / DC ma... Ω /... Ω Stroke limit control Sequence control Signal addition Range of lower limit Range of upper limit Terminal Starting point of sequence Operating range of sequence Z connected to R of Frost protection monitor QAF2.. Frost protection monitor QAF % adjustable...55 % adjustable...5 V adjustable V adjustable... Ω, added to signal DC.6 V, added to signal General ambient conditions Operation EN Transport EN Storage EN Environmental conditions Class 3K5 Class 2K3 Class K3 Temperature C C C Humidity % rh < 95 % rh % rh Internal diagrams SKD32.5, SKD32.2 AC 23 V, 3-Position SKD32.5 AC 23 V, 3-Position 2 n a b c Cm c c2 N ASC a b c c c2 ASZ G2 4567G Cm end switch n solenoid valve for springreturn c, c2 ASC9.3 double auxiliary switch a, b, c ASZ7.. potentiometer Positioning signal «open» 2 Positioning signal «close» 2 spring-return function N neutral conductor Cm N SKD82.5 AC 24 V, 3-Position SKD82.5 AC 24 V, 3-Position 2 n ASC9.3 ASZ a b c Cm c c2 G ASC9.3 ASZ a b c c c2 4569G2 4569G Cm end switch n solenoid valve for springreturn c, c2 ASC9.3 double auxiliary switch a, b, c ASZ7.. potentiometer Positioning signal «open» 2 Positioning signal «close» 2 spring-return function G System potential Cm G ASC9.3 ASZ SKD6, SKD62 SKD62U, SKD62UA AC 24 V, DC V, 4 2 ma, Ω U Z M DC... V oder ma G G... Ω DC... V oder ma Hub voll offen ganz geschlossen Ausgang Eingang Zwangsteuerung (Signalpriorität) Eingang Valve Seat Detection Valve Jam Detection Pumpe Solenoid Hub Hub 76de U Z M position indication override control positioning signal measuring neutral G operating voltage AC 24 V: system neutral (SN) G operating voltage AC 24 V: system potential (SP) G G Speisung MMI Einstellungen und Anzeige Ventil 2/6
13 Connection terminals SKD6.. G G M U Z operating voltage AC 24 V: system neutral (SN) operating voltage AC 24 V: system potential (SP) Positioning signal DC... (3) V or DC ma Measuring neutral (= G) Position indication DC... V or DC ma Override control (functionality see page 7) Auxiliary switch ASC c 4 5 Connection diagrams SKD32.. AC 23 V 3-Position SKD32.2, SKD32.5 AC 23 V (L) L SKD G5 AC 23 V (L) L F () (2) (N) N () (2) (N) N G N N N 2 N F temperature limiter N, N2 controller, 2 actuators L N Phase neutral Positioning signal «open» 2 Positioning signal «close» 2 Spring-return function SKD82.. AC 24 V 3-Position SKD82.5, SKD82.5U AC 24 V 325G3 (G) G (SP) SKD82.5, SKD82.5U AC 24 V 325G2 (G) G (SP) F () (2) (G) N () (2) (G) N G G 2 F temperature limiter N, N2 controller, 2 actuators G (SN) SP Systempotential AC 24 V SN System neutral G (SN) Q, Q2 controller contacts Positioning signal «open» 2 Positioning signal «close» 2 Spring-return function 3/6
14 SKD6.. AC 24 V DC V, 4 2 ma, Ω Dimensions actuator N controller F temperature limiter F2 frost protection thermostat terminals: 3 frost hazard / sensor is interrupted (thermostat closes with frost) 2 normal operation F3 frost protection monitor QAF2.. or QAF6.. (for SKD62UA only) * G (SP) System potential AC 24 V G (SN) System neutral * Only with sequence control and the appropriate selector switch settings (see page 6) All dimensions in mm A 4 x M2 2.5 * * A * M * Height of actuator from valve plate without stroke inverter ASK5 = 3 mm Height of actuator from plate with stroke inverter ASK5 = 357 mm ** SKD..U with knockouts for standard ½" conduit connectors (Ø 2.5 mm) = > mm Minimum clearance from ceiling or wall for mounting, = > 2 mm connection, operation, maintenance etc. ASK5 stroke inverter 9, ,5 8 2* M2 8,5 8 * Maximum stroke = 2 mm 4/6
15 Replacement parts Order numbers for replacement parts Cover Hand control ) Control unit Actuator type SKD SKD SKD SKD SKD82.5U SKD SKD82.5U SKD SKD62U SKD SKD62UA ) hand control, blue with mechanical parts 5/6
16 6/ Siemens Building Technologies Ltd. Subject to alteration
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