Siemens ACVATIX SKB Series Manual page 8

Override control Z
SKB60, SKB62..
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
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
Input
The mechanical spring-return function is not affected by the direction of operation selected.
8
Siemens
Smart Infrastructure
Z-mode
Fully open Closed
● Z-contact directly ● 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
Override with 0...1000 Ω
Equal percentage or linear
● Z-contact connected to
connected to G0 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
SKB62UA only
● Z-contact
connected to R of
frost protection
monitor QAF21..
or QAF61..
● Valve stroke
follows Y and
R(Z) signal
Stroke
CM1N4564en
2023-10-17