Data Sheet for Product

4/20
Siemens Modulating refrigerant valves with magnetic actuator, PS45 CE2N4714en
Smart Infrastructure 2021-08-02
80 %
100 %
0 %
0 % 100 %
Y-input
Stroke
In the case of a 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
minimum stroke can be defined via the
controller 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
.
Do not under any circumstances use potentiometer Rv 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
Transfer
function
• ZC not connected
• Valve will follow the Y-signal
• Minimum stroke set-ting with
potentiometer Rv possible
• 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 setting with potentiometer Rv possible.
The printed circuit board of the MVL661..-.. has a slot to facilitate calibration.
To calibrate, insert a screwdriver in the slot so that the contacts inside are
connected. As a result, the valve will first be fully closed and then fully
opened.
Calibration matches the electronics to the valve mechanism.
During calibration, the green LED flashes for about 10 seconds; refer to
"Indication of operating state" (page 5).
01124
MVL661..-.. refrigerant valves are supplied fully calibrated.
Execute a calibration after replacing the electronics, when the red LED is lit or flashing
or when the valve is leaking (at seat).
Minimum stroke
setting
Caution
Forced control input ZC
Signal priority
Calibration
When is a calibration
required?