Operating Instructions

Fuses
Fault indications and warning indications
68 | 80
A6V12052002
Figure 55: Fuse components.
Pull fuse holder [3] out of pin carrier, open fuse cover and replace old fuses by new
ones.
Test/replace fuses F3/F4
Loosen screws [1] and remove cover [2] on the rear of the actuator controls.
Figure 56: Fuse replacement.
The power supply unit has measurement points (solder pins) that enable resistance
(continuity) measurement:
Verifying
Measuring points
F3
MTP5 – MTP6
F4
MTP7 – MTP8
To replace defective fuses: Carefully loosen power supply unit [3] and pull out. (The
fuses are on the equipped part of the power supply board).
NOTICE
Cable damage due to pinching! Risk of functional failures.
Carefully assemble power supply unit to avoid pinching the cables.
Motor protection (thermal monitoring)
To protect against overheating and impermissibly high surface temperatures at the
actuator, PTC thermistors or thermoswitches are embedded in the motor winding. The
thermoswitch is tripped as soon as the maximum permissible winding temperature has
been reached.
The actuator is switched off and the following signals are given:
● LED 3 (motor protection trippped) on the local controls is illuminated.
● Status indication S0007 displays a fault.