Motor Thermal Protection - Danfoss FC 300 Design Manual

FC 300 Design Guide
The electronic thermal relay (ETR) of the adjustable frequency drive cannot be used as motor
protection for the individual motor of systems with parallel-connected motors. Provide further
motor protection with, for example, thermistors in each motor or individual thermal relays. (Circuit
breakers are not a suitable means of protection).
6.5.7. Direction of Motor Rotation
The default setting is clockwise rotation with
the adjustable frequency drive output connec-
ted as follows.
Terminal 96 connected to U-phase
Terminal 97 connected to V-phase
Terminal 98 connected to W-phase
Thedirection of motor rotation is changed by
switching two motor phases.

6.5.8. Motor Thermal Protection

The electronic thermal relay in the adjustable frequency drive has received UL approval for single
motor protection when par. 1-90
current, I
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
6.5.9. Motor Thermal Protection
The electronic thermal relay in the adjustable frequency drive has received UL approval for single
motor protection when par. 1-90
current, I
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
6.6.1. Installation of Brake Cable
(Only for adjustable frequency drives ordered with brake chopper option).
The connection cable to the brake resistor must be shielded.
Motor Thermal Protection
is set to the rated motor current (see motor nameplate).
M,N
Design Guide
Motor Thermal Protection
is set to the rated motor current (see motor nameplate).
M,N
Design Guide
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
ETR Trip
is set for
for further information.
ETR Trip
is set for
for further information.
6. How to Install
Motor
and par. 1-24
Motor
and par. 1-24
133
6