Additional Motor Information; Motor Cable; Motor Thermal Protection; Parallel Connection Of Motors - Danfoss VLT AutomationDrive FC 300 Design Manual

Electrical Installation

7.4 Additional Motor Information

7.4.1 Motor Cable

The motor must be connected to terminals U/T1/96, V/
T2/97, W/T3/98. Earth (Ground) to terminal 99. All types of
three-phase asynchronous standard motors can be used
with a frequency converter unit. The factory setting is for
clockwise rotation with the frequency converter output
connected as follows:
Terminal No.
96, 97, 98, 99
Table 7.34 Terminal Functions
7 7
U V
96 97
U V
96 97
Illustration 7.41 Terminal Connection for Clockwise and Counter-
clockwise Rotation
132
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®
VLT
Function
Mains U/T1, V/T2, W/T3
Earth (Ground)
W
98
W
98
MG33BE02 - VLT
AutomationDrive FC 300 Design Guide, 0.25-75 kW
•
Terminal U/T1/96 connected to U-phase
•
Terminal V/T2/97 connected to V-phase
•
Terminal W/T3/98 connected to W-phase
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.
NOTE
If a retrofit applications requires unequal amount of wires
per phase, consult the factory for requirements and
documentation or use the top/bottom entry side cabinet
option.

7.4.2 Motor Thermal Protection

The electronic thermal relay in the frequency converter 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
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. When 1-90 Motor Thermal
Protection is set to [20] ATEX ETR is combined with the use
of MCB 112, 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 frequency converter
for safe operation of Ex-e motors.

7.4.3 Parallel Connection of Motors

The frequency converter can control several parallel-
connected motors. When using parallel motor connection
following must be observed:
•
Recommended to run applications with parallel
motors in U/F mode 1-01 Motor Control Principle.
Set the U/F graph in 1-55 U/f Characteristic - U
and 1-56 U/f Characteristic - F.
•
VCC
•
The total current consumption of the motors
must not exceed the rated output current I
the frequency converter.
•
If motor sizes are widely different in winding
resistance, starting problems may arise due to too
low motor voltage at low speed.
®
is a registered Danfoss trademark
plus mode may be used in some applications.
for
INV