Data Sheet for Product

ManualsBrandsSiemens ManualsControl ValvesSKC Electronic Spring Return Valve Actuator w/ 1-1/2" Stroke (24 VAC)

CM1N4566en Smart Infrastructure

2021-06-07

ACVATIX™

Electro-hydraulic actuators for valves

SKC..

with a

0 mm

stroke

● SKC32.. Operating voltage AC 230 V, 3-position control signal

● SKC82.. Operating voltage AC 24 V, 3-position control signal

● SKC6.. Operating voltage AC 24 V,

– Control signal DC 0...10 V, 4...20 mA or 0...1000 Ω

– SKC62/MO RS-485 for Modbus RTU communication

– Selection of flow characteristic, position feedback, stroke calibration, LED

status indication, override control

– SKC62UA with selection of direction of operation, stroke limit control,

sequence control with adjustable start point and operation range, operation of

frost protection monitors QAF21.. and QAF61..

● Positioning force 2800 N

● 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 and stem heater

● SKC..U are UL-approved

Summary of content (31 pages)

PAGE 1
ACVATIX™ Electro-hydraulic actuators for valves SKC.. with a 40 mm stroke ● ● ● ● ● ● ● ● ● CM1N4566en 2021-06-07 SKC32.. Operating voltage AC 230 V, 3-position control signal SKC82.. Operating voltage AC 24 V, 3-position control signal SKC6.. Operating voltage AC 24 V, – Control signal DC 0...10 V, 4...20 mA or 0...
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Use For the operation of Siemens 2-port and 3-port valves of the types VVF.. and VXF.. with a 40 mm stroke as control and safety shut-off valves in heating, ventilation and air conditioning systems.
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Automatic operation mode For automatic operation, turn the manual adjuster clockwise to the end stop. The pressure cylinder moves upwards to the 0% stroke position of the valve. In the display window, the read scale disappears. Afterwards, swing the crank closed. Minimal volumetric flow The actuator can be manually adjusted to a stroke position > 0%, allowing its use in applications requiring a constant minimal volumetric flow.
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Electronics SKC60 1) 1) 1 Connection terminals 2 DIL switches 3 LED status indication 4 Stroke calibration From version ..L onward DIL switches Direction of operation Fail-in-place (behaviour in case of control signal loss) ** Positioning signal Y Flow characteristic Positioning feedback U ON Reverse acting Stops at current position DC 4...20 mA lin = linear OFF * Direct acting Closes DC 0...
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DIL switches Positioning signal Y Flow characteristic Positioning feedback U ON DC 4...20 mA lin = linear OFF * DC 0...
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SKC62/MO The Modbus converter is designed for analog control at 0...10 V. Keep the analog signal setting on the actuator as is (switch 1 to OFF); adjustment not permitted. The actuators are factory configured for equal-percentage characteristic. DIL switch (internal actuator characteristic changeover) to "log" (switch 2 to OFF). Functions Spring-return function The SKC32.61.., SKC82.61.. and SKC62..
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The LED on the SKC62/MO cable adapter flashes red during the calibration, as the positioning signal Y and the positioning feedback U do not correspond anymore. This is interpreted as a blockage and thus indicated as an error. necessary, the calibration can be repeated any number of times. LED indication of operational status SKC60, SKC62.., SKC62/MO The dual-colored LED indicating the operational status is visible when the cover is removed.
PAGE 8
Override control Z SKC60, SKC62..
PAGE 9
Stroke limit control and sequence control SKC62UA Setting the stroke limit control Setting the sequence control The rotary switches LO and UP can be used to apply a lower and upper limit to the stroke in increments of 3%, up to a maximum of 45%. The rotary switches LO and UP can be used to determine the start point or the operating range of a sequence.
PAGE 10
Type summary Operasting voltage Type SKC32.60 Positioning signal Spring-return- Positioning Function Time - - yes 18 s - - yes 18 s - - yes 20 s Opening Closing 1) SKC32.60/F 1), 3) AC 230 V SKC32.61 1) SKC32.61/F 1), 3) - SKC82.60 1) 3-position 120 s SKC82.60U 2) SKC82.61 1) SKC82.61U 2) 120 s SKC60 1), 4) SKC62 1) Standard electronics SKC62/F 1), 3) AC 24 V DC 0...10 V 4...20 mA 0...
PAGE 11
SKC.. ASZ6.6 (S55845-Z108) Steam heater SKC32.. SKC82.. ● For media below 0 °C ● Mount between valve and actuator ASC9.3 ASZ7.3 Double auxiliary switch Potentiometer Adjustable switching points 0…1000 Ω Note: ASZ7.3 For the combination SIMATIC S5/S7 and use of positioning feedback, we recommend actuators with DC 0...9.8 V feedback signals. The signal peaks that occur in the potentiometer ASZ7.3 may result in error messages on Siemens SIMATIC.
PAGE 12
Ordering (example) Type / Stock number 1) Designation Number of pieces SKC62/MO / S55195-A127 Actuator Modbus RTU 1 ASC1.6 Auxiliary switch 1 1) Specify stock number if available. Spare parts Actuator Hand control 1) Cover Clamp Stem connection Control unit SKC32.60 410355768 SKC32.61 SKC82.60 SKC82.60U 410356058 SKC82.61 410355768 SKC82.
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3-port valves VX.. (control valves for “mixing” and “distribution”) Valve type DN PN class kvs Data sheet [m3/h] VXF21.. 1) 100 6 124...160 N4410 160 N4401 100...150 10 124...315 N4420 160...400 N4402 124...315 N4430 49...300 N4440 VXF22.. VXF31.. 1) VXF32.. VXF40.. 1) VXF41.. 1) 16 Flanged 65...150 VXF43.. 15...80 63...400 N4404 VXF42.. 100...150 25 125...400 N4403 VXF53.. 65...150 25 63...400 N4405 40 49...300 N4482 VXF61..
PAGE 14
Notes Safety CAUTION National safety regulations Failure to comply with national safety regulations may result in personal injury and property damage. ● Observe national provisions and comply with the appropriate safety regulations. WARNING Tensioned spring return Opening the actuator housing can release the highly tensioned return spring, which can cause flying parts and injuries. ● Do not open the actuator housing.
PAGE 15
Engineering Conduct the electrical connections in accordance with local regulations on electrical installations as well as the section Connection diagrams [➙ 26]. NOTE Using a safety limiter Failure to comply with applicable regulations for cable insulation may result in the suspension of the safety limiter function. ● Compliance with all applicable regulations for cable insulation must be ensured by the plant operator.
PAGE 16
Mounting Mounting Instructions 74 319 0324 0 for fitting the actuator to the valve and A5W00027551 for SKC62/MO are enclosed in the actuator packaging. The instructions for accessories are enclosed with the accessories themselves (see Product documentation [➙ 13]). Mounting positions Commissioning When commissioning the system, check the wiring and functions, and set any auxiliary switches and potentiometers as necessary, or check the existing settings.
PAGE 17
Operation Automatic operation For automatic operation, the crank [2] on the manual adjustment knob [1] must be engaged. If not engaged, turn the crank counter-clockwise until the display window [3] shows neither the scale [4] nor the crank engagement bar. Manual operation For manual operation, swing out the crank [2] so that the display window [3] becomes visible.
PAGE 18
WARNING Risk of injury ● Disconnect electrical connections from the terminals as neede. ● The actuator must be properly installed prior to recommissioning the valve. Recommendation SKC6..: Trigger stroke calibration after maintenance. Repair: See Spare parts [➙ 12] WARNING VerlRisk of injury through broken housing or cover Dismounting the actuator with broken housing from the valve can release the highly tensioned spring return, which can cause flying parts and injury.
PAGE 19
Technical data Power supply Operating voltage SKC32.. AC 230 V ± 15 % SKC82.. SKC6.. AC 24 V ± 20 % (SELV/PELV) SKC62/MO Frequency 50 / 60 Hz Maximum power consumption at 50 Hz SKC32.60, SKC32.60/F 18 VA / 14 W SKC32.61, SKC32.61/F 24 VA / 18 W SKC82.60, SKC82.60U 15 VA / 12 W SKC82.61, SKC82.61U 19 VA / 14 W SKC60.. 17 VA / 13 W SKC62.. 21 VA / 15 W External supply cable fuse SKC32.. Min. 0.5 A, slow Max. 6 A slow SKC82.. Min. 1.6 A, slow SKC6.. Max.
PAGE 20
Signal inputs / signal outputs Positioning signal Y SK6.. Input impedance DC 0…10 V 100 kΩ DC 4…20 mA 240 Ω Signal resolution <1% Hysteresis 1% Override control Z SK6.. Resistor 0…1000 Ω Z not connected, priority terminal Y No function Z connected directly to G Max. stroke 100 % Z connected directly to G0 Min. stroke 0 % Z connected to M via 0...1000 Ω Stroke proportional to R Position feedback U SK6.. Load impedance DC 0…9.8 V > 10 kΩ DC 4…19.
PAGE 21
Electrical connections and connecting cable Wire cross-sectional area 0.5...2.5 mm2, AWG 21...14 3) Cable entries 4 x M20 (∅ 20.5 mm) SKC..U With knockouts for standard ½" conduit connectors (∅ 21.5 mm) SKC62/MO Fixed connecting cable Cable length 0.9 m Number of cores 5 x 0.
PAGE 22
Dimensions / weight Dimensions See Dimensions [➙ 30] Weight SKC32.60, SKC32.60/F 9.80 kg SKC32.61, SKC32.61/F 9.85 kg SKC82.60 9.80 kg SKC82.60U 10.10 kg SKC82.61 9.85 kg SKC82.61U 10.15 kg SKC60 SKC62, SKC62/MO External Modbus converter SKC62U SKC62UA 9.85 kg 0.15 kg 10.15 kg Materiald Housing Die-cast aluminium Bracket Housing box Plastic Manual adjuster Accessories Auxiliary switch ASC1.6 SKC6.. Switching capacity AC 24 V, 10 mA....
PAGE 23
Connection diagrams Internal diagrams SKC32.. SKC32.61 SKC32.60 AC 230 V 3-position Cm1 End switch n Solenoid valve for spring-return c1, c2 ASC9.3 double auxiliary switch a, b, c ASZ7.3 potentionmeter Y1 Positioning signal „open“ Y2 Positioning signal „close“ 21 Spring-return function N Neutral conductor SKC82.. SKC82.61 SKC82.60 AC 24 V 3-position Siemens Smart Infrastructure Cm1 End switch n Solenoid valve for spring-return c1, c2 ASC9.3 double auxiliary switch a, b, c ASZ7.
PAGE 24
SKC6.. SKC60, SKC62 SKC62U, SKC62UA AC 24 V DC 0...10 V 4...20 mA 0...
PAGE 25
Connection terminals SKC6.. AC 24 V DC 0...10 V 4...20 mA 0...1000 Ω System neutral (SN) System potential (SP) Positioning signal DC 0...10 (30) V or DC 4...20 mA Measuring neutral (= G0) Position indication DC 0...10 V oder DC 4...20 mA Override control (Functions [➙ 8]) SKC62/MO AC 24 V Modbus RTU Connecting cable System neutral (SN) Black System potential (SP) Red Reference line (Modbus RTU) Violet Bus + (Modbus RTU) Gray Bus - (Modbus RTU) Pink Auxiliary switch ASC1.
PAGE 26
Connection diagrams SKC32.. SKC32.61 SKC32.60 AC 230 V 3-position 26 Siemens Smart Infrastructure F1 Safety limiter (e.g.
PAGE 27
SKC82.. SKC82.61, SKC82.61U SKC82.60, SKC82.60U AC 24 V 3-position F1 Siemens Smart Infrastructure Safety limiter (e.g.
PAGE 28
SKC6.. SKC60 DC 0...10 V AC 24 V 4...20 mA 0...1000 Ω SKC62, SKC62U, SKC62UA DC 0...10 V AC 24 V 4...20 mA 0...1000 Ω Y1 Actuator F3 Temperature detector N1 Controller F4 Frost protection monitor with 0...1000 Ω signal output, e.g. QAF21.. or QAF61.. (only SKC62UA) *) F1 Safety limiter (e.g.
PAGE 29
SKC62/MO AC 24 V Modbus RTU A Actuator N1 Controller G System potential G0 System neutral REF Reference line (Modbus RTU) + Bus + (Modbus RTU) - Bus - (Modbus RTU) NOTE Using safety limiter F1 When using the safety limiter F1, ensure that no mistakes may occur on cable insulation that may cancel out the temperature limiter function (applies to both 230 V as well as 24 V types). ● For SN earthing (e.g. PELV) comply under all circumstances with the note above.
PAGE 30
Dimensions Actuator All dimensions in mm * Height of actuator from plate with stroke inverter ASK51 = 432 mm ** SKC..U: with knockouts for standard ½" conduit connectors (∅ 21.5 mm) > 100 mm, minimum clearance form ceiling or wall for mounting > 200 mm, connection, operation, maintenance, etc.
PAGE 31
Revision numbers Type Valid from rev. no. Type Valid from rev. no. SKC32.60 ..D SKC62 ..G SKC32.60/F ..D SKC62/F ..G SKC32.61 ..D SKC62U ..G SKC32.61/F ..D SKC60 ..G SKC82.60 ..D SKC62UA ..G SKC82.60U ..D SKC62/MO ..H SKC82.61 ..D SKC82.61U ..D B Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug Tel. +41 58 724 2424 www.siemens.