3.6.3 Motor Thermal Protection
The electronic thermal relay in the adjustable frequency
drive has received UL-approval for single motor protection,
when parameter 1-90 Motor Thermal Protection is set for
ETR Trip and 1-24 Motor Current is set to the rated motor
current (see motor nameplate).
For thermal motor protection, it is also possible to use the
MCB 112 PTC thermistor card option. This card provides
ATEX certification to protect motors in explosion hazardous
areas, Zone 1/21 and Zone 2/22. When
parameter 1-90 Motor Thermal Protection is set to [20] ATEX
ETR and MCB 112 are combined. It is possible to control an
Ex-e motor in explosion hazardous areas. Consult the
programming guide for details on how to set up the
adjustable frequency drive for safe operation of Ex-e
motors.
Installation Instruction Manual
MG37A222 Danfoss A/S © Rev. 2014-02-07 All rights reserved. 39
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