4.4.3 Motor Thermal Protection
The electronic thermal relay in the adjustable frequency
drive has received UL-approval for single motor overload
protection, when parameter 1-90 Motor Thermal Protection
is set to [4] ETR Trip and parameter 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
VLT PTC Thermistor Card MCB 112 option. This card
provides an ATEX certicate to protect motors in explosion
hazard areas, Zone 1/21 and Zone 2/22. When
parameter 1-90 Motor Thermal Protection is set to [20] ATEX
ETR and is combined with the use of MCB 112, it is
possible to control an Ex-e motor in explosion hazardous
areas. Consult the relevant programming guide for details
on how to set up the adjustable frequency drive for safe
operation of Ex-e motors.
Electrical Installation Instruction Manual
MG11F522 Danfoss A/S © 08/2014 All rights reserved. 65
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