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 certificate 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.
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Summary of Contents for VLT HVAC Drive FC 102
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