Notes On Main Circuit Wiring - Bosch Rexroth EFC 3600 Operating Instructions Manual

Bosch Rexroth AG
Mounting and Installation
5.5

Notes on Main Circuit Wiring

● Connect power supply only to the mains power supply terminals (L1, L2 and L3 for
3-phase; 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.
● Insulated crimp terminals must be used to connect terminals and conductors to en‐
sure the reliability of connection.
● After wiring connection, remove all residual loose wires, which may fall into the fre‐
quency converter and cause a failure. Be careful not to allow swarf from drilling en‐
tering 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 supply and wait for 10 minutes to
allow the capacitor of the DC circuit to discharge.
● Wiring shall be carried out with wire sizes in accordance with relevant electrical co‐
des.
● 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 en‐
sure both the action of frequency converter protection and shutting off of power sup‐
ply (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 reduced torque output by
the motor.
● Nothing other than the brake resistor may be connected between the terminal (+)
and B. Do not short circuit!
● Electromagnetic interference: The inputs/outputs of frequency converters contain
harmonic components, which may interfere with nearby communication 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 interference.
● Do not attach power capacitor, surge suppressor or radio noise filter to the output
side of frequency converters. This may cause frequency converter failure 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.
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DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600