3.10.3 Motor Thermal Protection
The electronic thermal relay in the adjustable frequency drive has received UL approval for single motor protection, when par. 1-90
Motor Thermal
Protection
is set for
ETR Trip
and par. 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 an ATEX certificate to protect motors
in explosion hazard areas, Zone 1/21 and Zone 2/22. Please refer to the
Design Guide
for further information.
3 How to Install VLT AQUA High Power Instruction Manual
3-76
MG.20.P3.22 - VLT
®
is a registered Danfoss trademark
3
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