Additional Motor Information; Motor Cable - Danfoss VLT AutomationDrive FC 300 Design Manual

Electrical Installation

7.4 Additional Motor Information

7.4.1 Motor Cable

All types of 3-phase asynchronous standard motors can be
used with a frequency converter unit. The motor must be
connected to the following terminals:
•
U/T1/96
•
V/T2/97
•
W/T3/98
•
earth to terminal 99
Factory setting is for clockwise rotation with the frequency
converter output connected as follows:
7 7
Terminal no.
96
97
98
99
Table 7.63 Motor Cable Terminals
•
Terminal U/T1/96 connected
to U-phase
•
Terminal V/T2/97 connected
to V-phase
•
Terminal W/T3/98
connected to W-phase
Table 7.64 Changing Motor Rotation
The direction of rotation can be changed by switching 2
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
Table 7.64.
F-frame requirements
F1/F3 frame
Each inverter module must have the same number of
motor phase cables and they must be in quantities of 2
(for example, 2, 4, 6, or 8). 1 cable is not allowed. The
cables are required to be equal length or within 10%
between the inverter module terminals and the first
198
®
VLT
Function
Mains U/T1
V/T2
W/T3
Earth
U V W
96 97 98
U V W
96 97 98
AutomationDrive FC 300 Design Guide 90-1200 kW
common point of a phase. The recommended common
point is the motor terminals. For example, if inverter
module A used a 100 m cable, then subsequent inverter
modules could use a cable between 90-110 m in length.
F2/F4 frame
Each inverter module must have the same number of
motor phase cables and they must be in quantities of 3
(for example, 3, 6, 9, or 12). 1 or 2 cables are not allowed.
The cables are required to be equal length or within 10%
between the inverter module terminals and the first
common point of a phase. The recommended common
point is the motor terminals. For example, if inverter
module A used a 100 m cable, then subsequent inverter
modules could use a cable between 90-110 m in length.
Output junction box requirements
The length ( minimum 2.5 m) and quantity of cables must
be equal from each inverter module to the common
terminal in the junction box.
NOTICE
If a retrofit application requires an unequal number of
wires per phase, consult the factory for requirements
and documentation, or use the top/bottom entry side
cabinet option.
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
the 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.
MG34S202 - Rev. 2013-08-19