10.3.2.
Motor protection (thermal monitoring)
In order to protect against overheating and impermissibly high surface temperatures
at the actuator, PTC thermistors or thermoswitches are embedded in the motor
winding. Motor protection trips as soon as the max. 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.
●
The status indications
S0007
or
S0011 Failure
display a fault.
The fault
Details
is displayed when selecting
Thermal fault
.
The motor has to cool down before operation can be resumed.
Depending on the parameter setting (motor protection behaviour), the fault signal is
either automatically reset or the fault signal has to be acknowledged.
The acknowledgement is made:
●
in selector switch position Local control (LOCAL) via push button RESET.
●
In selector switch position Remote control (REMOTE) with Reset command
via fieldbus.
Proof-test motor protection
Correct function of the motor protection can be tested.
Information
For weatherproof actuator controls mounted on wall bracket controlling an explosion-
proof actuator, the functionality of the motor protection must be verified at the latest
when performing the maintenance (refer to chapter <Servicing and maintenance>).
The test is performed by simulating the motor protection signal via actuator controls
local controls:
Required user level:
Specialist (4)
or higher.
Diagnostic M0022
TMS proof test M1950
Test procedure:
1.
Set selector switch to position 0 (OFF).
2.
Return to the main menu and select the simulation value in parameter
TMS
proof test M1950
: Select
Thermal test
.
3.
Activate motor protection simulation: Press
Ok
push button.
The safety function is correct if no fault signal is displayed.
4.
Reset simulation: Press
Ok
push button or exit the simulation menu and reset
the selector switch to its initial position.
57
SA 07.2-UW – SA 16.2-UW / SAR 07.2-UW – SAR 16.2-UW Control unit: electronic (MWG)
AC 01.2 Non-Intrusive Profinet
Corrective action
