Additional Motor Information; Motor Cable; Motor Thermal Protection - Danfoss VLT FC 102 Series Design Manual

Electrical Installation

6.4 Additional Motor Information

6.4.1 Motor Cable

The motor must be connected to terminals U/T1/96,
V/T2/97, W/T3/98. Ground to terminal 99. All types of
three-phase asynchronous standard motors can be used
with an adjustable frequency drive unit. The factory setting
is for clockwise rotation with the adjustable frequency
drive output connected as follows:
Terminal No. Function
96, 97, 98, 99 Line power U/T1, V/T2, W/T3
Ground
Table 6.34 Terminal Functions
Motor
U V W
2 2 2
U V W
1 1 1
FC
96 97 98
Motor
U V W
2 2 2
U V W
1 1 1
FC
96 97 98
Figure 6.40 Terminal Connection for Clockwise and Counter-
clockwise Rotation
•
Terminal U/T1/96 connected to U-phase
•
Terminal V/T2/97 connected to V-phase
•
Terminal W/T3/98 connected to W-phase
MG11BC22
Design Guide
The direction of rotation can be changed by switching two
phases in the motor cable or by changing the setting of
4-10 Motor Speed Direction.
Motor rotation check can be performed using 1-28 Motor
Rotation Check and following the steps shown in the
display.
NOTICE!
If a retrofit application requires unequal amounts of
wires per phase, consult the factory for requirements
and documentation or use the top/bottom entry side
cabinet option.

6.4.2 Motor Thermal Protection

The electronic thermal relay in the adjustable frequency
drive has received UL-approval for single motor protection,
when 1-90 Motor Thermal Protectionis set for ETR Trip and
1-24 Motor Current is set to the rated motor current (see
the motor nameplate).
For thermal motor protection,it is also possible to use the
PTC Thermistor Card option MCB 112. This card provides
an ATEX certificate to protect motors in explosion hazard
areas, Zone 1/21 and Zone 2/22. When 1-90 Motor Thermal
Protection is set to [20] ATEX ETR combined with the use of
MCB 112, it is possible to control an Ex-e motor in
explosion hazard areas. Consult the Programming Guide for
details on how to set up the adjustable frequency drive for
safe operation of Ex-e motors.
Danfoss A/S © Rev. 06/2014 All rights reserved.
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