PLDC01938
REVISION 00
01/06/2011
TECHNICAL DEPT
Stavale
- date 05/09/2011
149/195
Checking functioning of 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.
Checking with the motor dismounted
22
Before assembling the motor B to the reduction unit F, check continuity of the thermal cutout G7.
23
Obtain a digital multimeter with a continuity measurement function, see photograph below.
24
Position the two probes of the multimeter in the eye terminals M and verify continuity with a digital
multimeter.
25
If the multimeter display moves from the initial position, continuity is present and the thermal cutout G7 is
functioning correctly.
26
If the multimeter display does not move from the initial position, the thermal cutout G7 must be replaced.
i
B
PHOTO 312
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