OPERATION AND MAINTENANCE MANUAL
ID MOTORS
PAGE: 28
CODE: CTT52 EDITION: 03 RELEASE: APRIL 2019
Subject to technical changes without prior notice
Standard thermal protection
3.7.4
ID motors include a set of 2 PTC140-type thermistors on their main and auxiliary stator windings. It is a solid-state device of the
variable resistive type that 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 4 :
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.
Optional thermal sensors
3.7.5
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.
