7
Two adjustable limit switches are installed to limit the stroke of the actuator, and cut-off the motor current in the
relative direction.
Most motors have a thermal switch, depending on the actuator type, to cut off the current in both directions when a
maximum temperature is reached (only at standard single phase power supply). The thermal switch loop is closed by
the bridge between the X5/6 and X5/7 connections (see Figure 3).
7.2
Thermal switch as potential free contact
The thermo switch can be wired to the outside as follows:
Remove the bridge between connections X5/6 and X5/7.
Change the connections X1/11 and X1/13.
Check conductivity between connections X5/6 and X5/7 (connection must be there).
Connect the thermo switch as potential free contact to the connections X5/6 and X5/7.
Maximum thermal switch loading:
The thermo switch can be loaded up to the maximum nominal value for the motor (see motor nameplate).
When using the thermo switch as a potential-free contact, the switching signal must immediately
stop the motor. Re-starting the motor is allowed only after the thermo switch has reset. Failure to
observe this warning may result in damage to the actuator.
8.
Valve mounting
The PSR-E-C actuators are designed with a mechanical interface according to ISO 5211 for valve mounting. The gear
contains a double square SW17 to connect the actuator to the valve shaft.
Check that the actuator flange suits the valve flange.
Use standard adapters to adapt to the valve shaft
Clean the surface of the connection components, lubricate
valve shaft slightly
Position the actuator on the valve. Tighten the screws in a
diagonal sequence according to the required torque.
Pos. ①: Actuator flange
Pos. ②: Drive bush
Figure 6: Actuator flange
①
②
①
