22
Installation
CG Drives & Automation, 01-6142-01r0
Pay special attention to the following points:
•
If paint must be removed, steps must be taken to prevent
subsequent corrosion. Repaint after making connections!
•
The fastening of the whole AC drive housing must be
electrically connected with the mounting plate over an
area which is as large as possible. For this purpose the
removal of paint is necessary. An alternative method is to
connect the AC drive housing to the mounting plate
with as short a length of litz wire as possible.
•
Try to avoid interruptions in the screening wherever
possible.
•
If the AC drive is mounted in a standard cabinet, the
internal wiring must comply with the EMC standard.
Fig. 33 shows an example of a AC drive built into a
cabinet.
Fig. 33 AC drive in a cabinet on a mounting plate
Fig. 34 shows an example when there is no metal mounting
plate used (e.g. if IP54 AC drives are used). It is important
to keep the “circuit” closed, by using metal housing and
cable glands.
Fig. 34 AC drive as stand alone
Connect motor cables
1. Remove the cable interface plate from the AC drive
housing.
2. Put the cables through the glands.
3. Strip the cable according to Table 13.
4. Connect the stripped cables to the respective motor
terminal.
5. Put the cable interface plate in place and secure with the
fixing screws.
6. Tighten the EMC gland with good electrical contact to
the motor and brake chopper cable screens.
Placing of motor cables
Keep the motor cables as far away from other cables as
possible, especially from control signals. The minimum
distance between motor cables and control cables is 300 mm
(12 in).
Avoid placing the motor cables in parallel with other cables.
The power cables should cross other cables at an angle of
90
°
.
Long motor cables
If the connection to the motor is longer than 100 m (330
ft)(for powers below 7.5 kW (10.2 hp) please contact CG
Drives & Automation), it is possible that capacitive current
peaks will cause tripping at overcurrent. Using output coils
can prevent this. Contact the supplier for appropriate coils.
Switching in motor cables
Switching in the motor connections is not advisable. In the
event that it cannot be avoided (e.g. emergency or
maintenance switches) only switch if the current is zero. If
this is not done, the AC drive can trip as a result of current
peaks.
AC drive built into cabinet
AC drive
RFI-Filter
Mains
Metal EMC cable glands
Output coil (option)
Screened cables
Unpainted mounting plate
Metal connector housing
Motor
Metal EMC
coupling nut
Brake resistor
(option)
Mains
(L1,L2,L3,PE)
Litz
Motor
AC drive
RFI-Filter
Mains
Metal EMC cable
glands
Screened cables
Metal housing
Brake
resistor
(option)
Output
coils
(option)
Metal connector housing
Motor
Metal cable gland
Mains
