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
3
3
Summary of Contents for VLT AutomationDrive FC 302
Page 2: ......
