130BC983.10
Illustration 3.10 Location of Circuit Breaker, Mains Side, Large
Unit
3.3.3 Additional Motor Information
3.3.3.1 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 shown in
Terminal No.
Function
96, 97, 98, 99
Mains U/T1, V/T2, W/T3
Earth (Ground)
Table 3.6 Motor Connection - Factory Setting
•
Terminal U/T1/96 connected
to U-phase
•
Terminal V/T2/97 connected
to V-phase
•
Terminal W/T3/98
connected to W-phase
96
97
U
V
96
97
98
U
V
W
98
W
130HA036.10
Table 3.7 Motor Connection - Direction of Rotation
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.
3.3.3.2 Motor Thermal Protection
The electronic thermal relay in the frequency converter has
received UL-approval for single motor protection, when
1-90 Motor Thermal Protection
is set for
ETR Trip
and
1-24 Motor Current
is set to the rated motor current (see
motor name plate).
3.3.3.3 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
[0]. Set the U/F graph in
1-55 U/f Characteristic - U
and
1-56 U/f Characteristic - F
.
•
VCC
+
mode may be used in some applications.
•
The total current consumption of the motors
must not exceed the rated output current I
INV
for
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.
•
The electronic thermal relay (ETR) of the
frequency inverter cannot be used as motor
protection for the individual motor. Provide
further motor protection by e.g. thermistors in
each motor winding or individual thermal relays.
(Circuit breakers are not suitable as protection
device).
NOTE
Installations with cables connected in a common joint as
shown in the first example in the picture is only
recommended for short cable lengths.
NOTE
When motors are connected in parallel,
1-02 Flux Motor
Feedback Source
cannot be used, and
1-01 Motor Control
Principle
must be set to
Special motor characteristics (U/f)
.
The total motor cable length specified in
, is
valid as long as the parallel cables are kept short (less than
10 m each).
3.3.3.4 Motor Insulation
For motor cable lengths
≤
the maximum cable length
listed in the
, the following motor
insulation ratings are recommended because the peak
voltage can be up to twice the DC link voltage, 2.8 times
the mains voltage, due to transmission line effects in the
motor cable. If a motor has lower insulation rating it
recommended to use a du/dt or sine wave filter.
System Integration
VLT
®
Decentral Drive FCD 302
MG04H102 - VLT
®
is a registered Danfoss trademark
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