The mains contactor does not replace overcurrent protection devices connec‐
ted in the incoming circuit, but is a functional complement. The mains contac‐
tor itself needs overcurrent protection to allow reliably operating it after
switch-off processes.
In conjunction with the corresponding "circuit for the mains connection", the
mains contactor only switches the DC bus voltage to the drive controllers
when they are ready to consume power voltage and when there isn't any
error present.
In order that the drive controllers can signal their status, they must be sup‐
plied with the 24V control voltage.
The following scenarios are typical cases in which the circuit for the mains
connection is to switch off the mains contactor and lead to the power supply
being switched off:
●
Short circuit at the output of the inverters with error "F8060 Overcurrent
in power section"
●
Switch-on upon activated DC bus short circuit (ZKS) with error message
"F2820 Braking resistor overload"
●
Operation at mains voltages outside of the allowed range with error
message "F2815 Overvoltage in mains"
See also firmware documentation "Troubleshooting Guide" which con‐
tains the descriptions of the error messages (diagnostic messages).
Bb Contact
The mains contactor has to be controlled depending on the error status of the
supply unit or drive controller.
At the control section of the HCS drive controllers and at the supply units,
there is an isolated contact available for this purpose (relay contact Rel1) that
has been configured as Bb contact in the condition as supplied. When the Bb
contact closes, the drive or drive system is ready for power on.
Danger of consequential damage!
Make sure that the mains contactor interrupts power supply from
the mains when the Bb contact opens.
Load of Bb contact
Observe the load capability limits of the Bb contact (see Project
Planning Manual "Rexroth IndraDrive, Drive Controllers, Control
Sections" for the control section used [connection point X31.1,
X31.2]).
Control contactors with AC excitation and contactors exceeding
the load capability limits of the involved contact elements (Bb con‐
tacts etc.) via contactor relays.
See also Functional Description of firmware → Power Supply
Bosch Rexroth AG
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
142/309
Circuits for the Mains Connection
