User Manual

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Siemens Modulating refrigerant valves, PN 63 A6V11160433en / A5W00038735
Building Technologies 2018-07-17
When k
vs
reduction (DIL switch 4 in
position ON) the stroke will be lim-
ited to 63 % mechanical stroke. 63
% of full stroke then corresponds to
an input / output signal of 10 V.
If, in addition, the stroke is limited
to 80 %, for example, the minimum
stroke will be
0.63 x 0.8 = 0.50 of full stroke.
80 %
100 %
4716D01en
0 %
0 %
100 %
Y-input
Stroke
In t
he case of the suction throttle valve, it is
essential that a minimum stroke limit be
maintained to ensure compressor cooling
and efficient oil return. This can be
achieved with a reinjection valve, a bypass
line across the valve, or a guaranteed
minimum opening of the valve. The mini-
mum stroke can be defined via the control-
ler and control signal Y, or it can be set
directly with potentiometer Rv.
The factory setting is zero (mechanical stop in counterclockwise direction, CCW). The
minimum stroke can be set by turning the potentiometer clockwise (CW) to a maximum
of 80 % k
vs
.
Under no circumstances must potentiometer Rv be used to limit the stroke on
expansion applications. It must be possible to close the valve fully.
ZC – Function
no function fully open closed
Connections
G
G
G
Transferfunction
∂ ZC not connected
∂ Valve will follow the Y-signal
∂ Minimum stroke set-ting
with potentiometer Rv pos-
sible
∂ ZC connected to G
∂ Valve will fully open control
path A ⇓ AB
∂ ZC connected to G0
∂ Valve will close control path
A ⇓ AB
1. Forced control signal ZC
2. Signal input Y and/or minimum stroke set-ting with potentiometer Rv possible
k
vs
-reduction
Minimum stroke set-
ting
Attention
Forced control input ZC
Signal priority