Operating instructions

Mounting

4.5 Positioners exposed to strong acceleration forces or vibrations

SIPART PS2 with and without HART communications

50 Operating Instructions, 09/2008, A5E00074631-08

4.5.2 Friction clutch

Procedure

NOTICE

The following is applicable for the "flameproof enclosure" version:

• Move only the outer friction clutch. The inner friction clutch is fixed and may not be

moved in case of a flameproof enclosure.

• Do not open the flameproof enclosure of the positioner in explosion-prone atmospheres.

An additional friction clutch is therefore provided at the outer side of the shaft. Only the

outer friction clutch may be moved.

After installing the positioner and commissioning it completely, set the torque of the friction

clutch as follows:

1. Insert a commercially available, approximately 4 mm wide screwdriver in the slit of the

yellow wheel on the module cover.

2. Move the yellow wheel anticlockwise using the screwdriver until it noticeably engages.

This intensifies the torque of the friction clutch.

3. A fixed friction clutch is characterized by an approximately 1 mm wide gap between the

yellow and the black wheels.

4. In order to carry out zero balancing, e.g. after changing the actuator, first reduce the

torque by rotating clockwise up to the end stop of the yellow wheel. After zero balancing,

fix the friction clutch again as described above.