Electro-hydraulic actuators for valves

Transcription

1 4 56 Electro-hydraulic actuators for valves with a 2 mm stroke SKD82... : Operating voltage AC 23 V, 3-position control signal SKD82...: Operating voltage AC 24 V, 3-position control signal Actuator versions with or without spring-return function Positioning force N For direct mounting on valves; no adjustments required Manual adjuster and position indicator Additional functions with auxiliary switches, potentiometer, stem heater and mechanical stroke inverter SKD82...U are UL-approved Use For the operation of Siemens two-port and three-port valves, types VVF..., VVG..., VPF..., VXF... and VXG... with a 2 mm stroke. Field of application in accordance with IEC Class 3K5 Ambient temperatures: C Temperature of medium in the connected valve: C >4 C: use type SKB actuators < C: type ASZ6.5 stem heater required CMN456E 9.22 Siemens Building Technologies HVAC Products

2 Functions Electro-hydraulic actuators; no maintenance required Pump, pressure cylinder and piston to open valve Return spring and bypass valve to close valve Choice of actuators with or without spring-return function to DIN 3273 Manual adjuster and position indication Mounting spaces for dual auxiliary switches and a potentiometer Stem heater can be fitted if required Mechanical stroke inverter can be installed if required SKD82...U actuators are UL-approved Types Type Operating Control Spring-return Running time voltage (Control signal) Function Time Opening Closing SKD32.5 AC 23 V 3-position No -- 2 s 2 s SKD32.5 Yes 8 s SKD s s SKD82.5 AC 24 V No -- 2 s 2 s SKD82.5U * SKD82.5 Yes 8 s SKD82.5U * * UL-approved versions Accessories Type ASZ7.3 * ASZ7.3 * ASZ7.32 * ASZ6.5 ASK5 Description Dual auxiliary switches Potentiometer Ω Potentiometer 35 Ω Potentiometer 2 Ω Stem heater AC 24 V Mechanical stroke inverter * Only one potentiometer per actuator may be installed Ordering When ordering please specify the quantity, product name and type code. Example: actuator, type SKD32.5 and potentiometer, 35 W, type ASZ7.3 Delivery The actuator, valve and accessories are supplied in separate packaging and not assembled prior to delivery. Compatibility Controllers The actuators can be driven by all control systems which have an AC 24 V SELV/PELV supply (SKD82 ) or AC 23 V supply (SKD32 ) and which operate with 3-position signals. 2/8 Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products 9.22

3 Mounting on linear valves The actuators are suitable for operation of the following Siemens two-port and three-port valves with a 2 mm stroke: Valve DN PN Data sheet Two-port valves VV (control valves or safety shut-off valves): VVF2... (Flange) mm 6 bar 43 VVF3... (Flange) mm bar 432 VVF4... (Flange) mm 6 bar 433 VVF4... (Flange) 5 mm 6 bar 434 VVG4... (Screwed) mm 6 bar 4363 VVF52... (Flange) mm 25 bar 4373 VVF6... (Flange) 5 and 25 mm 4 bar 4382 Three-port valves, VX... (control valves for mixing and distribution) VXF2... (Flange) mm 6 bar 44 VXF3... (Flange) mm bar 442 VXF4... (Flange) mm 6 bar 443 VXF4... (Flange) mm 6 bar 444 VXG4... (Screwed) mm 6 bar 4463 VXF6... (Flange) 5 and 25 mm 4 bar 4482 Combination valve VP (Two-port valve with integrated differential pressure controller): VPF52... (Flange) mm 25 bar 4374 For admissible differential pressures p max and closing pressures p s, refer to the relevant valve data sheets. Note Third-party valves with strokes between 6 and 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 Y signal must be routed via an additional freely-adjustable end switch () to limit the stroke. We recommend that you contact your local Siemens office for the necessary information. Technology Principles of electro-hydraulic actuators Manual adjuster Pressure cylinder 3 Piston 4 Reservoir 5 Pressure chamber 6 Pump 7 Return spring 8 Bypass valve 9 Coupling Valve stem Inner valve 2 Position indicator ( to ) Valve closed Valve open Voltage at Y: The pump (6) forces hydraulic oil from the reservoir (4) into the pressure chamber (5) thereby generating the stroke: the valve stem () retracts and the valve plug opens (). Voltage at Y2: The bypass valve (8) opens, allowing the hydraulic oil to flow back from the pressure chamber (5) into the reservoir (4) via the return spring (7). The valve stem () extends and the valve plug closes (). No voltage at Y or Y2: The actuator and valve hold the current stroke position. Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products /8

4 Spring-return function The SKD32.5, SKD32.2 and SKD82.5(U) actuators, which have a spring-return feature, incorporate a second bypass valve which opens if the 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 Accessories Dual auxiliary switches, Adjustable switching points ASZ potentiometer... Ω,...35 Ω,...2 Ω Z5 ASK5 mechanical stroke inverter % actuator stroke corresponds to % valve stroke Mount between valve and actuator ASZ6.5 stem heater Media below C Mount between valve and actuator Z See «Technical data» for further information. Engineering notes The actuators must be electrically connected in accordance with local wiring regulations and with the wiring diagrams on page 7/8. Regulations and requirements designed to ensure the safety of people and property must be observed at all times. The ASZ6.5 stem heater has a heat output of 3 VA and is required to keep the valve stem free of ice in the cooling range C C. In this case, in order to ensure adequate air circulation, the actuator bracket and the valve stem must not be insulated. Physical contact with unprotected hot components can cause burns. Failure to observe the above advice can result in accidents or fire. The admissible temperatures (see «Application» and «Technical data») must be observed. If auxiliary switches are used, their switching points must be shown on the plant schematic. 4/8 Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products 9.22

5 Mounting instructions Orientation 456Z Permissible Not permissible Instructions for fitting the actuator to the valve are bypacked in the actuator packaging. The instructions for accessories are enclosed with the accessories themselves. 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. 456Z2 456Z3 Coupling fully retracted stroke = % Coupling fully extended stroke = % 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..., VPF..., VXF... and VXG... to close (stroke = %). 33a 33b «MAN» Manual operation «AUTO» Automatic operation Maintenance When servicing the valve: Switch OFF the pump and power supply, close the main shut-off valves in the pipework, release pressure in the pipes and allow them to cool down completely. If necessary, disconnect electrical connections from terminals. The valve must be re-commissioned only with the actuator correctly assembled. Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products /8

6 Disposal The actuator includes electrical and electronic components and must not be disposed of as domestic waste. Current local legislation must be observed. Warranty The application-related technical data ( p max, p s, leakage, noise levels and service life) is valid for the Siemens actuators only in conjunction with the Siemens valves listed in the section on «Compatibility». Before using these actuators with third-party valves, written approval must be obtained from Siemens Building Technologies. A failure to obtain this approval invalidates any guarantee. Technical data Power supply Operating voltage SKD82... Frequency Power consumption SKD32.5 SKD82.5(U) SKD32.2 SKD32.5 SKD82.5(U) Fuse for supply cable SKD82... AC 23 V ±5 % AC 24 V ±2 % 5 or 6 Hz 6 VA / W 3 VA / 8 W 2 VA / 3 W 2 VA / 3 W 8 VA / W Operating data Type of control 3-position General ambient conditions Running time at 5 Hz SKD , SKD (U) SKD32.2 Spring-return time (closing) SKD32.2, SKD32.5, SKD82.5(U) Nominal stroke Positioning force Maximum admissible temperature of medium in the connected valve: Operation Environmental conditions Temperature Humidity Transport Environmental conditions Temperature Humidity Storage Environmental conditions Temperature Humidity Min.,5 A slow blow, max. 6 A slow blow Min. A slow blow, max. A slow blow Opening 2 s 3 s 8 s 2 mm N 4 C To IEC Class 3K C % rh To IEC Class 2K C <95 % rh To IEC Class K C % rh Closing 2 s s 6/8 Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products 9.22

7 Industry standards Dimensions Weight Materials Cable glands Meets the requirements for CE marking in EMC Directive Low Voltage Directive Electromagnetic compatibility Interference emission Interference immunity 89/336/EEC 73/23/EEC EN Residential EN Industrial Product standards for automatic electric controls EN C-tick N474 Protection standard IP54 to EN 6529 Protection class SKD82... III to EN 673 I to EN 673 UL approval UL 873 See «Dimensions», SKD82... SKD82...U ASK5 stroke inverter Actuator housing and bracket Housing box and manual adjuster, SKD82... SKD82...U 3.6 kg (including packaging) 3.85 kg (including packaging). kg (including packaging) Die-cast aluminum Plastic Pg (4 x) Pg 6 (4 x) Accessories Dual auxiliary switches, Switching capacity of one auxiliary switch AC 25 V, 6 (2.5) A ASZ potentiometer Change in overall resistance of potentiometer at nominal stroke... Ω (ASZ7.3) Ω (ASZ7.3)... 2 Ω (ASZ7.32) ASZ6.5 stem heater Operating voltage Power consumption (heat output) AC 24 V ±2 % 3 VA Connection diagrams 85 L T F Y Y2 N Y Y2 3 3 a b c % % c c2 % % 2 Y Y2 3 3 a b c % % c c2 % % AC 23 V Cm N ASZ Y2 n Cm N ASZ Y SKD32.5 SKD32.5 SKD32.2 F Safety thermostat N Controller Y/2 Actuators C/2 Change-over switch Cm End switch Dual auxiliary switches ASZ Potentiometer N L Phase N Neutral conductor Y Control signal «Open» Y2 Control signal «Close» 2 Spring-return function Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products /8

8 SKD G T F Y Y2 N Y Y2 3 3 a b c 2 Y Y2 3 3 a b c % % c c2 % % % % c c2 % % AC 24 V Cm G ASZ Y2 n Cm G ASZ Y SKD82.5 (U) SKD82.5 (U) F Safety thermostat N Controllers Y/2 Actuators C/2 Change-over switch Cm End switch Dual auxiliary switches ASZ Potentiometer G G System potential G System neutral Y Control signal «Open» Y2 Control signal «Close» 2 Spring-return function Dimensions All dimensions in mm A Pg Pg6** 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 ** The hole diameter on the SKD82 U actuators corresponds to the Pg6 gland. = > 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 8/8 22 Siemens Building Technologies Ltd. Subject to alteration Siemens Building Technologies Electro-hydraulic actuators for valves CMN456E HVAC Products 9.22