Data Sheet for Product

MVL661… Modulating Refrigerant Valves Technical Instructions
Valves with Magnetic Actuator Document Number 155-400
May 11, 2016
Page 3
Operator controls and
indicators in the
electronics housing
1 Connection terminals
2 LED for indication of operating state
3 Minimal stroke setting potentiometer Rv
4 Auto-calibration
5 DIP switches for mode control
DIP Switch
Configurations
Table 1. DIP Switch Configurations.
Switch
Function
ON/OFF
Description
Positioning signal Y
ON
Current (mA)
OFF
Voltage (V)
1)
Positioning range Y and U
ON
2 to 10 Vdc, 4 to 20 mA
OFF
0 to 10 Vdc, 0 to 20 mA
1)
Position feedback U
ON
Current (mA)
OFF
Voltage (V)
1)
Nominal flow rate C
V
(k
vs
)
ON
63%
OFF
100%
1)
1)
Factory setting
Technical/
Mechanical Design
Features and Benefits
 Four selectable control signals.
 DIP switch to reduce the C
V
(k
vs
) value to 63% of the nominal value.
 Potentiometer for adjustment of minimum stroke for suction throttle applications.
 Automatic stroke calibration.
 Forced control input for “Valve closed” or “Valve fully open”.
 LED for indicating the operating state.
Control
The MVL661… Series valve can be driven by Siemens or third-party controllers that
deliver a 0 to 10 Vdc/2 to10 Vdc, 0 to 20 mA/4 to 20 mA control signal.
For optimum control performance, Siemens Industry, Inc. recommends a 4-wire
connection between controller and valve.
The valve stroke is proportional to the control signal.
CAUTION:
You must use a four-wire connection with Vdc power supply.
Spring return action
If the positioning signal is interrupted, or in the event of a power failure, the valve’s return
spring will automatically close control path A  AB.