Motor Protection (Thermal Monitoring) - AUMA SA 07.2 Operation Instructions Manual

Corrective action
10.3.2

Motor protection (thermal monitoring)

56
SA 07.2 SA 16.2/SAR 07.2
1. Loosen screws [1] and remove plug/socket connector [2].
2. Pull fuse holder [3] out of pin carrier, open fuse cover and replace old fuses by
new ones.
Fuses F3/F4: test/replace
1. Loosen screws [1] and remove cover [2] on the rear of the actuator controls.
The power supply unit has measurement points (solder pins) allowing to perform
a resistance (continuity) measurement:
Verifying
F3
F4
2. 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).
Cable damage due to pinching!
Risk of functional failures.
Carefully assemble power supply unit to avoid pinching the cables.
In order 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 max. permissible winding
temperature has been reached.
The actuator is switched off and the following signals are given:
LED 3 (thermal fault) on the local controls is illuminated.
SAR 16.2 Control unit: electromechanic
AC 01.2 Intrusive
Measuring points
MTP5 MTP6
MTP7 MTP8