Siemens ACVATIX SKB Series User manual

CM1N4564en
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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
1
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 (0 to 1)
10
Coupling
11
Valve stem
12
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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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)
1
Connection terminals
2
DIL switches
3
LED status indication
4
Stroke calibration
1)
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
ON
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..
1
Connection terminals
2
DIL switches
3
LED status indication
4
Stroke calibration
2)
Up to and including version ..K

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DIL switches
Positioning signal Y
Positioning feedback U
Flow characteristic
ON
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
1
Connection terminals
2
DIL switches
3
LED status indication
4
Stroke calibration
5
Rotary switch UP
(factory setting 0)
6
Rotary switch LO
DIL switches
Direction of operation
Sequence control or stroke
limit control
Positioning signal Y
Positioning feedback U
Flow characteristic
ON
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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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
0 %
0
100 %
0
0 V
0
10 V
1
3 %
1
97 %
1
1 V
1
10 V *
2
6 %
2
94 %
2
2 V
2
10 V **
3
9 %
3
91 %
3
3 V
3
3 V ***
4
12 %
4
88 %
4
4 V
4
4 V
5
15 %
5
85 %
5
5 V
5
5 V
6
18 %
6
82 %
6
6 V
6
6 V
7
21 %
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
30 %
A
70 %
A
10 V
A
10 V
B
33 %
B
67 %
B
11 V
B
11 V
C
36 %
C
64 %
C
12 V
C
12 V
D
39 %
D
61 %
D
13 V
D
13 V
E
42 %
E
58 %
E
14 V
E
14 V
F
45 %
F
55 %
F
15 V
F
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
0
→
1
QAF21..
0
→
2
QAF61..

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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
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
1)
Approbation: CE
2)
Approbation: CE, UL
3)
Only available in France
4)
Enhanced functions (from version ..L): Direction of operation, fail-in-place
5)
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
Max.1
Max.1
Max.1
SKB82
SKB6..
Max.1
-
-

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SKB..
ASZ6.6 (S55845-Z108)
Stem heater
●For media below 0 °C
●Mount between valve and actuator
ASK51
Mechanical stroke inverter
●0% actuator stroke corresponds to
100% valve stroke
●Mount between valve and actuator
SKB32..
SKB82..
ASC9.3
Double auxiliary switch
●Adjustable switching points
ASZ7.3
Potentiometer
●0…1000 Ω
SKB60
SKB62..
ASC1.6
Auxiliary switch
●Switching point 0...5% stroke
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. This is not the case when combined with Siemens HVAC controllers.
The reason is that SIMATIC has a higher resolution and faster response time.
Use the potentiometer as voltage divider on the 3-
wire connection. Powering the potentiometer over the
wiper may shorten the life cycle of the potentiometer.
Signal peaks increase in frequency and scope over
the lifespan in this operating mode.
For more information, see Technical data [➙19]

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Ordering (example)
Type / Stock number 1)
Designation
Number of pieces
SKB62/MO / S55195-A127
Actuator Modbus RTU
1
ASC1.6
Auxiliary switch
1
1)
Specify stock number if available.
Spare parts
Actuator
Cover
Hand control 1)
Clamp
Stem connection
Control unit
SKB32.50, SKB32.50/F
410455828
426855108
410355768
417856498
-
SKB32.51, SKB32.51/F
SKB82.50
SKB82.50U
410356058
SKB82.51
410355768
SKB82.51U
410356058
SKB60
410355768
466857598
SKB62, SKB62/F
466857488
SKB62U
410356058
SKB62UA
466857518
SKB62/MO
410355768
466857488
1)
Hand control, blue with mechanical parts
Equipment combinations
2-port valves VV.. (control or safety shut-off valves)
Valve type
DN
PN class
kvs
[m3/h]
Data sheet
VVF21..1)
Flanged
25...80
6
1.9...100
N4310
VVF22..
2.5...100
N4401
VVF31.. 1)
15...80
10
N4320
VVF32..
1.6...100
N4402
VVF40.. 1)
16
1.9...100
N4330
VVF41.. 1)
50
19...31
N4340
VVF45..
N4345
VVF42..
15...80
1.6...100
N4403
VVF52.. 1)
15...50
25
0.16...25
N4373
VVF53..
15...40
0.16...40
N4405
VVF61..
15...50
40
0.19...31
N4382
VVF63..
15...50
0.2...36
A6V11459527
VVG41..
Threaded
15...50
16
0.63...40
N4363
Admissible differential pressures Δpmax and closing pressures Δps: cf. relevant valve data sheets
1)
Valves are no longer available

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3-port valves VX.. (control valves for “mixing” and “distribution”)
Valve type
DN
PN class
kvs
[m3/h]
Data sheet
VXF21..1)
Flansch
25...80
6
1.9...100
N4410
VXF22..
2.5...100
N4401
VXF31..1)
15...80
10
N4420
VXF32..
1.6...100
N4402
VXF40..1)
16
1.9...100
N4430
VXF41..1)
15...50
1.9...31
N4440
VXF42..
15...80
1.6...100
N4403
VXF53..
15...50
25
1.6...40
N4405
VXF61..
40
1.9...31
N4482
VXF63..
0.2...36
A6V11459527
VXG41..
Gewinde
16
1.6...40
N4463
Admissible differential pressures Δpmax and closing pressures Δps: cf. relevant valve data sheets
1)
Valves are no longer available
Third-party valves with strokes between 6...20 mm can be motorized, provided they are
“closed with the de-energized” fail-safe mechanism and provided that the necessary
mechanical coupling is available. For SKB32.. and SKB82.. the Y1 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.
Product documentation
SKB..
Accessories
Mounting instructions
Mounting instructions SKB../SKC..
M3240
74 319 0324 0
ASC1.6
G4563.3
4 319 5544 0
74 319 0326 0
(Setting instructions Standard electronics)
ASC9.3
G4561.3
4 319 5545 0
ASK51
M4561.6
4 319 5550 0
A5W00027551
(Mounting instructions Modbus converter)
ASZ7.3
74 319 0247 0
ACT control unit
M4568
74 319 0554 0
A6V12057657
(Communication profiles Modbus)
QAF21..
74 319 0399 0
ASZ6.6
M4501.1
74 319 0750 0
Related documents such as environmental declarations, CE declarations, etc., can be
downloaded at the following Internet address:
http://siemens.com/bt/download

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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.
WARNING
Risk 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.
●NEVER dismount actuator from valve.
●Dismount valve-actuator combination (control device) as complete unit.
●Disassembly only by qualified personnel.
●Send the control device along with an error report to the local Siemens office for
analysis and disposal.
●Mount new control device (valve and actuator) properly.
WARNING
Risk of burns from hot actuator brackets
The actuator brackets on heating plants can also become hot from the contact with the hot
valve during operation. The temperature of the actuator bracket can reach 100 °C.
When servicing the actuator:
●Switch off both pump and operating voltage.
●Close the main shutoff valve in the piping.
●Release pressure in the pipes and allow them to cool off completely.

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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.
WARNING
Risk of injury and fire from hot device parts
For media below 0 °C, the stem heater ASZ6.6 keeps the valve stem ice-free. In this case,
the actuator bracket and the valve stem must not be insulated in order to ensure air
circulation.
Touching heated parts without safety measures leads to burns.
●For safety reasons, the steam heater is operated with AC 24 V / 30 W.
●Recommendation: For media above 140 °C, the valve must be insulated.
Observe admissible temperatures, see Use [➙2] and Technical data [➙19].
If an auxiliary switch is used, its switching point should be indicated on the plant schematic.
Every actuator must be driven by a dedicated controller, see Connection diagrams [➙26].

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Mounting
Mounting Instructions 74 319 0324 0 for fitting the actuator to the valve and A5W00027551
for SKB62/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.
Cylinder with valve stem
connector fully retracted
→ stroke = 0 %
Cylinder with valve stem
connector fully extended
→ stroke = 100 %
The manual adjuster must be rotated counter-clockwise to the end stop.
This causes the Siemens valves, types VVF.. und VXF.. to close (stroke = 0 %).
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.

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Manual operation
For manual operation, swing out the crank [2] so that the display window [3] becomes visible.
By rotating the crank or the manual adjustment knob [1], the display window shows the
engagement bar and/or the scale dial [4] with stroke indication.
Engaged crank [2] on the manual adjustment knob [1]
Display window with invisible scale dial and crank
engagement bar
Swung-out crank; display window [3]
Display window with scale dial [4] and stroke indication
in mm
Maintenance
The actuators are maintenance-free.
When servicing the control device:
WARNING
Risk of burns from hot actuator brackets
The actuator brackets on heating plants can also become hot from the contact with the hot
valve during operation. The temperature of the actuator bracket can reach 100 °C.
When servicing the actuator:
●Switch off both pump and operating voltage.
●Close the main shutoff valve in the piping.
●Release pressure in the pipes and allow them to cool off completely.
WARNING
Risk of injury
●Disconnect electrical connections from the terminals as neede.
●The actuator must be properly installed prior to recommissioning the valve.

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Recommendation SKB6..:
Trigger stroke calibration after maintenance.
Repair:
See Spare parts [➙12]
WARNING
Risk 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.
●NEVER dismount actuator from valve.
●Dismount valve-actuator combination (control device) as complete unit.
●Disassembly only by qualified personnel.
●Send the control device along with an error report to the local Siemens office for
analysis and disposal.
●Mount new control device (valve and actuator) properly.
Disposal
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.
The device is considered an electronic device for disposal in accordance
with the European Guidelines and may not be disposed of as domestic gar-
bage.
●Dispose of the device through channels provided for this purpose.
●Comply with all local and currently applicable laws and regulations.
Warranty
Technical data on specific applications are valid only together with Siemens products listed
under "Equipment combinations". Siemens rejects any and all warranties in the event that
third-party products are used.

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CM1N4564en
Smart Infrastructure
2023-10-17
Technical data
Power supply
Operating voltage
SKB32..
AC 230 V ± 15 %
SKB82..
AC 24 V ± 20 % (SELV/PELV)
SKB6..
SKB62/MO
Frequency
50 / 60 Hz
Maximum power consumption at 50 Hz
SKB32.50, SKB32.50/F
10 VA / 8 W
SKB32.51, SKB32.51/F
16 VA / 12 W
SKB82.50, SKB82.50U
8 VA / 7 W
SKB82.51, SKB82.51U
12 VA / 9 W
SKB60..
10 VA / 8 W
SKB62..
14 VA / 10 W
External supply cable fuse
SKB32..
Min. 0.5 A, slow
Max. 6 A slow
SKB82..
Min. 1 A, slow
Max. 10 A slow
SKB6..
Function data
Positioning time at 50 Hz 1)
SKB32.5..
Opening, closing
120 s
SKB82.5..
Opening, closing
120 s
SK6..
Opening
120 s
Closing
10 s
Spring-return time 1)
10 s
Positioning force
2800 N
Nominal stroke
20 mm
Maximum permissible medium temperature (valve fitted)
-25...220 °C
< 0 °C:
Requires stem heater ASZ6.6
Signal inputs / signal outputs
Control signal
SKB32..
3-position
SKB82..
SKB6..
DC 0…10 V
DC 4…20 mA
0…1000 Ω
Positioning signal Y SK6..
Input impedance
DC 0…10 V
100 kΩ
DC 4…20 mA
240 Ω
Signal resolution
< 1 %
Hysteresis
1 %

20
Siemens
CM1N4564en
Smart Infrastructure
2023-10-17
Signal inputs / signal outputs
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…19.6 mA
< 500 Ω
Enhanced functions SKB60 2), SKB62UA
Selection of direction of operation
SKB60,
SKB62UA
Direct-acting / reverse-
acting
DC 0...10 V / DC 10...0 V
DC 4...20 mA / DC 20...4 mA
0...1000 Ω / 1000...0 Ω
Stroke limit control
SKB62UA
Range of lower limit
0...45 % adjustable
Range of upper limit
100...55% adjustable
Sequence control
SKB62UA
Terminal Y
Starting point of sequence
0...15 V adjustable
Operating range of
sequence
3...15 V adjustable
Signal addition
SKB62UA
Z connected to R of
Frost protection monitor
QAF21..
0…1000 Ω, added to Y signal
Frost protection monitor
QAF61..
DC 1.6 V, added to Y signal
Communication SKB62/MO
Communication protocol
Modbus RTU
RS-485, not galvanically isolated
Number of nodes
Max. 32
Adress range
1...248 / 255
Factory setting
255
Transmission formats
1-8-E-1 / 1-8-O-1 / 1-8-N-1 / 1-8-N-2
Factory setting
1-8-E-1
Baud rates (kBaud)
Auto / 9.6 / 19.2 / 38.4 / 57.6 / 76.8 / 115.2
Factory setting
Auto
Bus termination
120 Ω electronically switchable
Factory setting
Off