4.10.3 Motor Thermal Protection
The electronic thermal relay in the frequency converter 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 name plate).
For thermal motor protection it is also possible to use the MCB 112 PTC Thermistor Card option. This card provides ATEX certificate to protect motors in
explosion hazardous areas, Zone 1/21 and Zone 2/22. Please refer to the
Design Guide
for further information.
4 How to Install
VLT HVAC Low Harmonic Drive Operating In-
structions
68 MG.16.A1.02 - VLT
®
is a registered Danfoss trademark
4
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