5.2.2 Main Circuit Wiring
Main circuit wiring cautions
● Connect power supply only to the main circuit terminals L1, L2 and L3.
Connecting power supply to other terminals will damage the frequency
converter. Ensure that the power supply voltage is within the allowable
voltage range specified on the nameplate.
● The grounding terminal must be properly grounded to avoid electric
shock or fire and reduce interference noise.
● Insulated crimp terminals must be used to connect terminals and con‐
ductors, to ensure the reliability of connection.
● After wiring connection, remove all wire residues, which may fall into the
frequency converter and cause a failure. Be careful not to allow swarf
from drilling entering the frequency converter. Check the following points
after the circuit connection is completed.
1. Are all connections correct?
2. Are there any missing connections?
3. Do short circuits exist between terminals and wires or ground?
● To make changes in wiring, disconnect the power and wait for 30 mi‐
nutes to allow the capacitor of the DC circuit to discharge.
● For safety concerns, wiring shall be carried out with wire sizes in ac‐
cordance with relevant electrical codes.
● A fuse must be provided between the main circuit terminals (L1, L2 and
L3) and the 3-phase AC input power supply. It is preferable to connect a
magnetic contactor (MC) in series to ensure both the action of frequency
converter protection and shutting off of power supply (Surge absorbers
should be added at both sides of the magnetic contactor).
● If the wire between the frequency converter and the motor is very long,
particularly with low output frequency, the voltage drop may lead to a re‐
duced torque output by the motor.
● Nothing other than the brake resistors may be connected between the
terminal (+) and PB. Do not short circuit!
● Electromagnetic interference: The 3-phase inputs / outputs of frequency
converter contain harmonic components, which may interfere with near‐
by communication devices (e.g. AM radio receiver). Therefore, an op‐
tional radio noise filter (only for the input side) or line noise filter may be
installed to minimize interference.
● Do not attach power capacitor, surge suppressor or radio noise filter to
the output side of frequency converter. This may cause frequency con‐
verter failure or damage the capacitor or suppressor. Immediately re‐
move any such device which has been installed.
● Integral solid state short circuit protection does not provide branch cir‐
cuit protection. Branch circuit protection must be provided in accordance
with the National Electrical Code [USA] and any additional local codes.
● After connecting the power supply terminals, the motor and the control
terminals, replace the cover back before switching on the power. Take
account of the following instructions:
1. Ensure that the power supply can provide appropriate voltage and
current. Ensure that the rated current range of the circuit breaker is
within that of the converter and the power supply.
Bosch Rexroth AG DOK-RCON02-FV*********-IB08-EN-P44/259
Rexroth Frequency Converter Fv
Installation
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