5.5 Notes on Main Circuit Wiring
● Connect power supply only to the mains power supply terminals (L1, L2 and
L3 for 3 phases; L1 and L2 for 1 phase). 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
and fire and reduce interference noise.
● Crimp terminals with insulated sleeve must be used to connect terminals and
conductors to ensure the reliability of connection.
● After wiring connection, remove all residual loose wires, 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 af-
ter 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 supply and wait for 5 mi-
nutes to allow the capacitor of the DC circuit to discharge.
● Wiring shall be carried out with wire sizes in accordance with relevant electri-
cal codes.
● A fuse must be provided between the main power supply terminals and the
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, par-
ticularly with low output frequency, the voltage drop may lead to a reduced
torque output by the motor.
● Nothing other than the brake resistor may be connected between the termi-
nal (+) and B. Do not short circuit!
● Electromagnetic interference: The inputs/outputs of frequency converters
contain harmonic components, which may interfere with nearby communica-
tion devices (e.g. AM radio receiver). Therefore, an optional radio noise filter
(only for the input side) or line noise filter may be installed to minimize inter-
ference.
● Do not attach power capacitor, surge suppressor or radio noise filter to the
output side of frequency converters. This may cause frequency converter fail-
ure or damage the capacitor or suppressor. Immediately remove any of such
device if it has been installed.
● Integral solid state short circuit protection does not provide branch circuit
protection. Branch circuit protection must be provided in accordance with
the National Electrical Code [USA] and any additional local codes.
Bosch Rexroth AG
Mounting and Installation
EFC 3600
24/259
DOK-RCON03-EFC-3600***-IT03-EN-P
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