6
5. Function
The electric quarter-turn actuators series PSQx03 are designed to operate valves with 90° motion. The PSQ actuators
are provided with a mechanical interface according to ISO 5211 for valve mounting. The motor torque is transmitted
via a spur gear onto the sun wheel of a „Wolfrom“-gear. The rotating output wheel of the „Wolfrom“-gear holds a
removable drive bush to connect the actuator with the valve stem. Two adjustable position switches are limiting the
electrical motion in both directions by interrupting the motor current or control circuit when reaching the adjusted
position.
The 90° motion is mechanically adjustable by +/- 5° by means of two stop screws. Torque switches are installed for
each direction.
The handwheel does allow comfortable manual operation in case of power failure or for commissioning. The
handwheel is idle when the motor is operating the actuator, but engaged in any position without clutching or
declutching.
Electrical wiring is done to a terminal block under the actuator cover.
6. Manual operation
The actuators are supplied with a loosely enclosed handwheel. Mount the handwheel and the crank according to
Figure 3:
Figure 3: Handwheel assembly
The handwheel does provide manual operation in case of power failure or commissioning (valve mounting and
setting of end positions). It is idle when the motor is operating and always ready for operation without clutching or
declutching.
Figure 4: manual operation PSQ103-1503 Figure 5: manual operation PSQ2003/2803
Do not exceed the adjusted electrical stroke limits by handwheel.
The mechanical limits must be set accordingly.
Failure to observe this warning will change the electrical feedback setting!
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