PLDC01938
REVISION 00
01/06/2011
TECHNICAL DEPT
Stavale
- date 05/09/2011
151/195
C2.2 Checking and replacing the thermal cutout
Thermal cutouts protect electric motors from reaching high temperatures which could cause
irreparable damage They are usually installed on the hottest parts of the motor near the carbon
brushes, or on the casing where the carbon brushes are mounted.The thermal cutouts on IPC
scrubber driers are triggered by temperatures of 80° C to 110° C.
They work on a similar principle to an NC (Normally Closed) switch. When the approximate
trigger temperature has been reached, they open the electrical circuit and shut off power (via
the relay, contactor or power board) to the motor.
On the CT 230, when the thermal cutout trips (~80° C), the message (MOTOR
TEMPERATURE PAUSE!” is displayed. Power to the drive motor is not shut down to
enable the machine to be moved to a safe place.
STOP THE MACHINE AS SOON AS POSSIBLE!!
The error is memorised by the board until the thermal cutout is no longer at the trigger
temperature and the error has been cancelled from the control panel board by turning
the key to position "0".
Wait about ten minutes before turning the key back to position "1" and try to identify
why the thermal cutout tripped.
Check with the motor mounted
1
If after resetting the error by turning the key to the "0" position and with the drive motor cold to the touch, the
message "Motor Temperature PAUSE!" is still displayed, you are recommended to check the electrical
continuity of the thermal cutout or the stability of the electrical contacts.
2
Obtain a digital multimeter with a continuity measurement function, see photograph below.
3
Switch the machine off by turning the key to the "0" position and disconnecting the batteries from the main
wiring.
4
Remove the cover A protecting the connection wires by unscrewing the two screws A1.
A
PHOTO 316
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