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Override control Z
SKD60, SKD62..
D The override control input Z can be operated in the following modes of operation:
No function
Connections
Transfer
Equal percentage or
linear
● Z-contact not
connected
● Valve stroke follows
Y-input
Shown operation modes are based on the factory setting "direct acting".
Y-input has no effect in Z-mode.
Selection of direction of operation
SKD60 (from version ..L), SKD62UA
●
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
Input
The mechanical spring-return function is not affected by the direction of operation selected.
8
Siemens
Smart Infrastructure
Fully open
● Z-contact directly
connected to G
● Y-input has no effect
Reverse acting
DC 0...10 V
Input
DC 4...20 mA
0...1000 Ω
Z-mdoe
Closed
Override with
0...1000 Ω
Equal percentage or linear
● Z-contact directly
● Z-contact connected
connected to G0
to M via resistor R
● Starting position at
50 Ω
End position at
900 Ω
DC 0...10 V
DC 4...20 mA
0...1000 Ω
Signal addition
SKD62UA only
● Z-contact
connected to R of
frost protection
monitor QAF21.. or
QAF61..
● Valve stroke follows
Y and R(Z) signal
Stroke
CM1N4561en
2021-02-17
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