Siemens ACVATIX SKB Series User manual

CM1N4564en

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2023-10-17

ACVATIX™

Electro-hydraulic actuators for valves

SKB..

with a 20 mm stroke

●SKB32.. Operating voltage AC 230 V, 3-position control signal

●SKB82.. Operating voltage AC 24 V, 3-position control signal

●SKB6.. Operating voltage AC 24 V

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

–SKB62/MO RS-485 for Modbus RTU communication

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

status indication, override control

–SKB62UA 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, stem heater and

mechanical stroke inverter

●SKB..U are UL-approved

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Use

For the operation of Siemens 2-port and 3-port valves of the types VVF.., VVG.., VXF.. and

VXG.. with a 20 mm stroke as control and safety shut-off valves in heating, ventilation and

air conditioning plants.

Technical design

Principle of electro-hydraulic actuators

Manual adjuster

Pressure cylinder

Suction chamber

Return spring

Solenoid valve

Hydraulic pump

Piston

Pressure chamber

Position indicator (0 to 1)

Coupling

Valve stem

Plug

Valve closed

Valve opened

Opening the

valve

The hydraulic pump [6] forces oil from the suction chamber [3] to the

pressure chamber [8], thereby moving the pressure cylinder [2] downwards.

The valve stem [11] retracts and the valve opens. Simultaneously, the return

spring [4] is compressed.

Closing the

valve

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.

Manual

operation

mode

For manual operation, swing out the crank so that the display window

becomes visible. By rotating the crank clockwise, the pressure cylinder is

moved downwards. The display window shows the engagement bar and/or

the scale dial with stroke indication.

In the manual operation mode, the positioning signals Y and Z can further

open the valve but cannot move to the 0 % stroke position of the valve. To

retain the manually set position, switch off the power supply or disconnect

the positioning signals Y and Z. The crank remains swung out and in the

display window the red indicator dial remains visible.

Note:

When setting the controller to manual operation for a longer

period of time, we recommend adjusting the actuator with the

manual adjuster to the desired position. This guarantees that

the actuator remains in this position for that period of time.

Attention: Do not forget to switch back to automatic operation

after the controller is set back to automatic control.

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CM1N4564en

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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.

SKB32..

SKB82..

3-position

control signal

The actuator is controlled by a 3-position signal either via terminals Y1 or Y2

and generates the desired stroke, which is transferred to the valve stem:

●Voltage on Y1:

Piston extends

Valve opens

●Voltage on Y2:

Piston retracts

Valve closes

●No voltage on Y1 and Y2:

Piston and valve stem remain in the

respective position

SKB62..

SKB60

Y positioning

signal

DC 0...10 V

and/or

0...1000 Ω,

DC 4...20 mA

The actuator is either controlled via terminal Y or override control Z. The

positioning signals generate the desired stroke by means of the above

described principle of operation, which is transferred to the valve stem:

●Signal Y increasing:

Piston extends

Valve opens

●Signal Y decreasing:

Piston retracts

Valve closes

●Signal Y constant:

Piston and valve stem remain in the

respective position

●Override control Z:

See Functions [➙8]

Frost

protection

monitor

Frost

protection

thermostat

A frost protection thermostat can be connected to the SKB6.. actuator.

The added signals from the frost protection monitors QAF21.. and QAF61..

require the use of SKB62UA actuators. Notes on special programming of

the electronics are described under Electronics [➙5].

Connection diagrams for operation with frost protection thermostat or frost

protection monitor can be found under Connection diagrams [➙26].

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Electronics

SKB60 1)

Connection terminals

DIL switches

LED status indication

Stroke calibration

From version ..L onward

DIL switches

Direction of operation

Fail-in-place (behaviour in

case of control signal loss)

Positioning signal Y

Positioning feedback U

Flow characteristic

Reverse acting

Stops at current

position

DC 4...20 mA

lin = linear

OFF *

Direct acting

Closes

DC 0...10 V

log = equal

percentage

Relationship between

positioning signal Y and

volumetric flow

Factory setting: all switches OFF

Only considered when DIL switch 3 ON

(control signal = DC 4…20 mA)

SKB60 2), SKB62..

Connection terminals

DIL switches

LED status indication

Stroke calibration

Up to and including version ..K

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DIL switches

Positioning signal Y

Positioning feedback U

Flow characteristic

DC 4...20 mA

lin = linear

OFF *

DC 0...10 V

log = equal percentage

Relationship between

positioning signal Y and

volumetric flow

Factory setting: all switches OFF

SKB62UA

Connection terminals

DIL switches

LED status indication

Stroke calibration

Rotary switch UP

(factory setting 0)

Rotary switch LO

DIL switches

Direction of operation

Sequence control or stroke

limit control

Positioning signal Y

Positioning feedback U

Flow characteristic

Reverse acting

Sequence control

Signal addition

QAF21../QAF61..

DC 4...20 mA

lin = linear

OFF *

Direct acting

Stroke limit control

DC 0...10 V

log = equal

percentage

Relationship between

positioning signal Y and

volumetric flow

Factory setting: all switches OFF

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2023-10-17

SKB62/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 SKB32.51, SKB82.51.. and SKB62.. actuators, which feature a spring-return function,

incorporate a solenoid valve which opens if the control signal or power fails. The return

spring causes the actuator to move to the 0% stroke position and closes the valve.

Calibration

SKB60, SKB62.., SKB62/MO

In order to determine the stroke positions 0% and 100% in the valve, calibration is required

on initial commissioning.

Mechanical coupling of the actuator SKB6.. with a Siemens valve.

Actuator must bin in „Automatic operation mode“ enabling stroke calibration

to capture the effective 0% and 100% values.

AC 24 V power supply applied.

Housing cover removed.

1. Short-circuit contacts in calibration slot (e.g. with a

screwdriver) and trigger calibration process.

2. Actuator moves to 0% stroke position [1].

Valve closes.

3. Actuator moves to 100% stroke position [2].

Valve opens.

Measured values are stored.

LED flashes grün, positioning

feedback U inactive

Normal operation:

Actuator moves to the position [3] as indicated by signals

Y or Z.

LED is lit green permanently, positioning feedback U

active, values correspond to the actual positions.

A red lit LED on the actuator indicates a calibration error.

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The LED on the SKB62/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.

If necessary, the calibration can be repeated any number of times.

LED indication of operational status

SKB60, SKB62.., SKB62/MO

The dual-colored LED indicating the operational status is visible when the cover is removed.

LED

indication

Function

Remarks, troubleshooting

Lit green

Normal operation

Automatic operation; everything o.k.

Flashing green

Stroke calibration in progress

Wait until calibration is finished

(LED stops flashing, will be lit green or red)

Lit red

Faulty stroke calibration

Check mounting; restart stroke calibration (by short-circuiting

calibration slot)

Internal error

Replace electronics

Flashing red

Inner valve jammed

Troubleshoot, check valve, restart stroke calibration

Dark

No power supply

Check mains network, check wiring

Electronics faulty

Replace electronics

As a general rule, the LED can only assume the states shown above –continuously lit red or

green, flashing red or green, or off/dark.

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Override control Z

SKB60, SKB62..

The override control input Z can be operated in the following modes of operation:

Z-mode

No function

Fully open

Closed

Override with 0…1000 Ω

Signal addition

SKB62UA only

Connections

Transfer

Equal percentage or

linear

Equal percentage or linear

●Z-contact not

connected

●Z-contact directly

connected to G

●Z-contact directly

connected to G0

●Z-contact connected to

M via resistor R

●Starting position at 50 Ω

End position at 900 Ω

●Z-contact

connected to R of

frost protection

monitor QAF21..

or QAF61..

●Valve stroke follows

Y-input

●Y-input has no effect

●Valve stroke

follows Y and

R(Z) signal

Shown operation modes are based on the factory setting “direct acting”.

Y-input has no effect in Z-mode.

Selection of direction of operation

SKB60 (from version ..L), SKB62UA

●With normally-closed valves, “direct acting” means that with a signal input of 0 V, the

valve closes (applies to all Siemens valves listed under Equipment combinations [➙12]).

●With normally-open valves, “direct acting” means that with a signal input of 0 V, the valve

is open.

Direct acting

Reverse acting

Stroke

Input

DC 0...10 V

DC 4...20 mA

0...1000 Ω

Input

DC 0...10 V

DC 4...20 mA

0...1000 Ω

The mechanical spring-return function is not affected by the direction of operation selected.

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Stroke limit control and sequence control

SKB62UA

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.

Position

of LO

Lower stroke

limit

Position

of UP

Upper stroke

limit

Position

of LO

Sequence

control

start point

Position

of UP

Sequence

control

operating range

0 %

100 %

0 V

10 V

3 %

97 %

1 V

10 V *

6 %

94 %

2 V

10 V **

9 %

91 %

3 V

3 V ***

12 %

88 %

4 V

15 %

85 %

5 V

18 %

82 %

6 V

21 %

79 %

7 V

24 %

76 %

8 V

27 %

73 %

9 V

30 %

70 %

10 V

33 %

67 %

11 V

36 %

64 %

12 V

39 %

61 %

13 V

42 %

58 %

14 V

45 %

55 %

15 V

Operating range of QAF21.. (see below)

Operating range of QAF61.. (see below)

***

The smallest adjustment possible is 3 V; control with 0...30 V is only possible via Y.

Stroke control with QAF21.. / QAF61.. signal addition

SKB62UA

Setting the signal addition

The operating range of the frost protection monitor QAF21.. or

QAF61.. can be defined with rotary switches LO and UP.

Position of LO

Sequence control

start point

Position of UP

QAF21.. / QAF61..

operating range

→

QAF21..

→

QAF61..

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2023-10-17

Type summary

Type

Operating

voltage

Positioning

signal

Spring-return

Positioning time

Function

Time

Opening

Closing

SKB32.50 1)

AC 230 V

3-position

120 s

SKB32.50/F 1), 3)

SKB32.51 1)

yes

10 s

SKB32.51/F 1), 3)

SKB82.50 1)

AC 24 V

SKB82.50U 2)

SKB82.51 1)

yes

10 s

SKB82.51U 2)

SKB60 1), 4)

Standard

electronics

DC 0...10 V

4...20 mA

0...1000 Ω

10 s

SKB62 1)

yes

10 s

SKB62/F 1), 3)

SKB62U 2)

SKB62UA 2), 5)

Enhanced

electronics

SKB62/MO 2)

S55195-A127

Standard

electronics

Modbus RTU

Approbation: CE

Approbation: CE, UL

Only available in France

Enhanced functions (from version ..L): Direction of operation, fail-in-place

Enhanced functions: Direction of operation, stroke control limit, sequence control, signal addition

Scope of delivery

The actuator, valve and accessories are supplied in separate packaging and not assembled

prior to delivery.

Accessories / spare parts

Accessories

Type

Auxiliary

switch

Double

auxiliary

switch

Potentiometer

1000 Ω

Stem heater

AC 24 V

Mechanical

stroke inverter

ASC1.6

ASC9.3

ASZ7.3

ASZ6.6

(S55845-Z108)

ASK51

Max. 2

SKB32..

Max.1

SKB82

SKB6..

Max.1

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