Electro-hydraulic actuators for valves

Transcription

1 4 563 Electro-hydraulic actuators for valves with a 2 mm stroke SKD62... SKD6 SKD62...: Operating voltage AC 24 V, control signal DC V, 4 2 ma or... W, with spring-return function SKD6: as SKD62, but without spring-return function SKD62U: as SKD62, but UL-approved SKD62UA: as SKD62U, but with enhanced functions (stroke limit control, sequence control with adjustable start point and operating range, and choice of direction of operation) Choice of linear or equal-percentage flow characteristic Position feedback Stroke calibration LED status indication Override control anual adjuster and position indicator Positioning force N For direct mounting on valves; no adjustments required Additional functions with auxiliary switch, stem heater and mechanical stroke inverter SKD62U and SKD62UA are UL-approved CN4563E 9.22 Siemens Building Technologies HVAC Products

2 Application For the operation of Siemens two-port and three-port valves, types VVF..., VV..., VPF..., VXF... and VX... 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 AS6.5 stem heater required Functions Electro-hydraulic actuators; no maintenance required Pump, pressure cylinder and piston to open valve Return spring and bypass valve to close valve anual adjuster and position indication SKD62... with spring-return function to DIN 3273 Standard electronics: Choice of control signal (DC... V / ma /... Ω) Choice of flow characteristic (equal-percentage / linear) Position feedback Stroke calibration LED status indication Override control via terminal SKD62UA enhanced functions: Stroke limit control Sequence control with adjustable starting position and operating range Choice of direction of operation (direct acting / reverse acting) ounting space for auxiliary switch Stem heater can be fitted if required echanical stroke inverter can be installed if required SKD62U and SKD62UA actuators are UL-approved Types Versions with standard electronics Version with enhanced electronics Type Operating Control Spring-return Running time Enhanced function voltage (Control signal) Function Time Opening Closing SKD62 SKD62U * SKD6 AC 24 V DC... V, es 5 s 2 ma or... Ω No -- SKD62UA * AC 24 V DC... V, ma or... Ω 3 s 5 s No es 5 s 3 s 5 s Stroke limit control Sequence control Signal inversion * UL-approved versions Accessories Type ASC.6 AS6.5 ASK5 Description Auxiliary switch Stem heater AC 24 V echanical stroke inverter 2/2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

3 Ordering When ordering please specify the quantity, product name and type code. Example: actuator, type SKD62 and auxiliary switch ASC.6 Delivery The actuator, valve and accessories are supplied in separate packaging and not assembled prior to delivery. Compatibility Controllers ounting on linear valves The actuators can be driven by all control systems which have an AC 24 V SELV/PELV supply and operate with DC... V or ma signals. 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 VV4... (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 VX4... (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. We recommend that you contact local Siemens office for the necessary information. Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E 3/2

4 Technology Principles of electro-hydraulic actuators anual 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 Signal input increasing: The pump (6) forces hydraulic oil from the reservoir (4) into the pressure chamber (5) thereby generating the stroke: the valve stem () is retracted and the valve plug opens (). Signal input decreasing: 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 (). Signal input constant: The actuator and valve hold the current stroke position. Schematic diagram of the SKD actuator electronics U DC... V or ma... Ω Stroke Fully open Fully closed... % Output Input override (Signal priority) Pump Solenoid 76en DC... V or ma... % Input Valve Seat Detection Stroke Stroke Valve Jam Detection Power supply Settings and indicators User interface Valve Spring-return function All SKD62 actuators are factory-fitted with a spring-return function, so that if the control signal or power supply fails, the actuator will return to the «%» stroke position. The SKD6 is without spring-return function. In case of a power failure the actuator remains in the current stroke position. 4/2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

5 Override control The override control input () has three modes of operation: No function Override with... W % V V % U % U R % 5 9 R [W] -contact not wired Valve stroke follows control signal Valve fully opened U % % -contact connected directly to -input has no effect V -contact connected to via resistor R Linear or equal-percentage characteristic Starting position at 5 Ω / end position at 9 Ω -input has no effect Valve fully closed U % % -contact connected directly to -input has no effect V Note The -modes shown assume the factory-setting «direct-acting». Stroke calibration To determine the stroke positions and % in the valve, calibration is required when the valve/actuator are commissioned for the first time. For this purpose, the actuator must be mechanically connected to a Siemens valve (see «Compatibility») and must have a supply voltage of AC 24 V. The calibration procedure can be repeated as often as necessary. Before starting calibration, ensure that the manual adjuster is set to «Automatic» in order to register the actual values. There is a slot on the printed circuit boards of the actuators. To initiate the calibration procedure, the contacts inside this slot must be short-circuited (e.g. with a screwdriver). Automatic calibration proceeds as follows: Actuator runs to the «stroke» position (), valve closes, green LED flashes. Actuator then runs to the «stroke» position Stroke (2), valve opens, green LED flashes. % easured values are stored. The calibration procedure is finish, and the 2 3 green LED now glows steadily (normal operation). The actuator now moves to the position defined % by control signal or (3). Throughout this procedure, output U is inactive, i.e. the values only represent actual positions when the green LED stops flashing and remains on continuously. 24 t LED status indication LED Display Function Action reen On Normal operation Automatic operation, no problems Flashing Stroke calibration in progress Wait until calibration is complete (LED stops flashing) Red On Faulty stroke calibration Internal error Check mounting Re-start stroke calibration (by short-circuiting calibration slot) Replace electronics Flashing Inner valve jammed Check the valve Off No power supply Faulty electronics Check mains Replace electronics 5/2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

6 Standard electronics SKD62 SKD6 SKD62U 643 Connection terminals AC 24V 5/6Hz U...V 4...2mA Ohm Calib. Status green ok calib. Stroke calibration Calib. Status red error valve jam LED status indication DIL switches Functions see below ON OFF DIL switches Selection of control signal ON DC ma Linear Selection of flow characteristic * OFF DC... V Equal percentage Enhanced electronics SKD62UA 638 Connection terminals Stroke calibration Rotary switches LO and UP U AC 24V 5/6Hz...V 4...2mA Ohm Calib. Status Calib. Status green red ok calib. error valve jam LED status indication DIL switches Functions see below ON OFF DIL switches Select direction of operation Sequence control or stroke limit control Selection of control signal ON Reverse-acting Sequence control DC ma Linear Selection of flow characteristic * OFF Direct-acting Stroke limit control DC... V Equal percentage * Factory settings all switches OFF 6/2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

7 Selecting the direction of operation With normally-closed valves, «direct-acting» means that with a signal input of V, the valve closes (applies to all Siemens valves listed under «Compatibility» on page 3) With normally-open valves, «direct-acting» means that with a signal input of V, the valve is open. Direct-acting Reverse-acting % % ( V) Input DC... V DC ma... Ω ( V) % % Input 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. Stroke limit control and sequence control 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 3 V * 2 6 % 2 94 % 2 2 V 2 3 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 * The smallest adjustment is 3 V; control with 3 V is only possible via. Accessories ASC.6 auxiliary switch AS6.5 stem heater Switching point 5 % stroke For media below C ount between valve and actuator Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E 7/2

8 Engineering notes The actuators must be electrically connected in accordance with local wiring regulations and with the wiring diagram on page. Regulations and requirements designed to ensure the safety of people and property must be observed at all times. The AS6.5 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. ounting instructions Orientation 456 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 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 «AN» is no longer visible. This causes the Siemens valves, types VVF..., VV..., VPF..., VXF... and VX... to close (stroke = %). 33a 33b «AN» anual operation «AUTO» Automatic operation 8/2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

9 aintenance 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. 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 (SELV, PELV) AC 24 V ±2 % Frequency 5 or 6 Hz Power consumption 7 VA / 2 W External supply cable fuse in. A slow blow, max. A slow blow Operating data Type of control (proportional) DC... V, DC ma or... Ω Running time at 5 Hz Opening: 3 s / Closing: 5 s Spring-return time (closing) 5 s Nominal stroke 2 mm Positioning force N Flow characteristic Linear / equal percentage can be selected * Signal inputs Terminal Voltage Input impedance Current Input impedance Signal resolution Hysteresis DC... V kω DC ma 24 Ω < % % Terminal Resistance... Ω Override control functions not connected connected directly to connected directly to connected to via... Ω No function (priority at Terminal ) ax. stroke % in. stroke % Linear / equal percentage * in conjunction with valves listed under «Compatibility» on page 3 9/2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

10 Signal outputs eneral ambient conditions Industry standards Dimensions Weight aterials Cable glands Terminal U Voltage Load impedance Current Load impedance aximum admissible temperature of medium in the connected valve: 4 C Operation Environmental conditions Temperature Humidity Transport Environmental conditions Temperature Humidity Storage Environmental conditions Temperature Humidity eets the requirements for CE marking in EC Directive Low Voltage Directive Electromagnetic compatibility Emitted interference Interference immunity Product standards for automatic DC V ±2 % >5 Ω DC ma ±2 % <5 Ω To IEC Class 3K C % rh To IEC Class 2K C <95 % rh To IEC Class K C % rh 89/336/EEC 73/23/EEC EN Residential EN Industrial electric controls EN C-tick N474 Protection standard IP54 to EN 6529 Protection class III to EN 673 UL approval UL 873 See «Dimensions» SKD62, SKD6 3.6 kg (including packaging) SKD62U, SKD62UA 3.85 kg (including packaging) ASK5 stroke inverter. kg (including packaging) Actuator housing and bracket Housing box and manual adjuster SKD62, SKD6 SKD62U, SKD62UA Die-cast aluminum Plastic Pg (4 x) Pg 6 (4 x) 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 Accessories Range of lower limit Range of upper limit Terminal Starting point of sequence Operating range of sequence % adjustable % adjustable... 5 V adjustable V adjustable ASC.6 auxiliary switch Switching capacity of auxiliary switch AC 24 V, ma... 4 (2) A AS6.5 stem heater Operating voltage AC 24 V ±2 % Power consumption (heat output) 3 VA /2 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E

11 Connection diagram B 82 F (SP) B 2 3 Fuse B N AC 24 V U (SN) B F N Sensor Temperature limiter Controller Actuator Connection terminals U Operating voltage AC 24 V System neutral (SN) Operating voltage AC 24 V System potential (SP) Control signal DC... (3) V or DC ma easuring neutral (= ) Position indication DC... V or DC ma Override input (functions see page 5) ASC.6 auxiliary switch 3 84 c 4 5 Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E /2

12 Dimensions All dimensions in mm A Pg Pg6** A * * Height of actuator from valve plate without stroke inverter ASK5 = 3 mm Height of actuator from valve plate with stroke inverter ASK5 = 357 mm ** The hole diameter on the SKD62U... actuators corresponds to the Pg6 gland. = > mm inimum clearance from ceiling or wall for mounting, = >2 mm connection, operation, maintenance etc. ASK5 stroke inverter 9, ,5 8 2* ,5 8 * aximum stroke = 2 mm 2/2 22 Siemens Building Technologies Ltd. Subject to alteration Siemens Building Technologies Electro-hydraulic actuators for valves CN4563E