OPERATION AND MAINTENANCE MANUAL
MAC QM MOTORS
PAGE: 27
CODE: CTT42 EDITION: 01 RELEASE: JULY 2016
Subject to technical changes without prior notice
3.7.4
Standard thermal protection
MAC QM motors include a PTC140-type thermistor on their stator windings. It is a solid-state device whose resistance varies
significantly with temperature and provides a
Contact Open (OFF) / Contact Closed (ON)
type logical signal depending on
whether or not the temperature of the motor windings exceeds the reference temperature of the sensor, in this case 140°C.
Its operation curve is as follows:
Figure 3:
Characteristic curve of a PTC140
Said ON/OFF logical signal can be used by an external control circuit to process an alarm system to prevent the motor from
overheating.
3.7.5
Optional thermal sensors
The installation of other types of linear temperature probes is also possible on request. For example, KTY84-130 type sensors
can be installed on the windings, as well as PT100 sensors on the windings and/or bearings, which would monitor the operating
temperature at all times. The following graphs correspond to said sensors.
Please check with VASCAT for each specific case.
Summary of Contents for MAC QM
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