10-20 Requirements to the Mains Connection Rexroth IndraDrive
DOK-INDRV*-SYSTEM*****-PR02-EN-P
When a 30 mA residual-current-operated circuit-breaker triggers, it is
possible to use a residual-current-operated circuit-breaker with higher
trigger current for machine protection.
If this residual-current-operated circuit-breaker triggers accidentally, too,
check in how far the above conditions and dependencies can be
improved (for example, connecting current-compensated mains chokes in
the incoming circuit, increasing the inrush current limitation).
If there is no improvement achieved and the residual-current-operated
circuit-breaker, due to specific mains conditions on site, has to be used
nevertheless on the mains input side, connect an isolating transformer
between mains connection and power connection of the drive system.
This reduces the leakage current in the ground wire of the mains that is
produced during normal operation which allows using the residual-
current-operated circuit-breaker. The neutral point of the secondary
winding of the isolating transformer is connected to the equipment
grounding conductor of the drive system.
The ground-fault loop impedance must then be adjusted to the
overcurrent protective device so that the unit can be switched off in the
case of failure.
Before operating enable please check for correct function including
activation in the case of failure.
Exclusive Fusing by Residual-Current-Operated Circuit-
Breaker
For drive systems with electronic drive controllers exclusive protection by
means of a residual-current-operated circuit-breaker normally is not
possible and not allowed.
Electronic equipment that has a nominal power higher than 4 kVA or is
destined for permanent connection does not need to have residual-
current-operated circuit-breakers.
According to IEC 364 and EN 50178, the supply-side protection against
contact for indirect contact, i.e. in the case of insulation failure, has to be
provided in a different way, for example by means of overcurrent
protective device, protective grounding, protective-conductor system,
protective separation or total insulation.
Using Residual-Current-Operated Circuit-Breakers with
HCS02 Drive Controllers
A residual-current-operated circuit-breaker can be used at HCS02 drive
controllers under the following conditions:
• residual-current-operated circuit-breakers of type B (IEC60755)
• trip limit of residual-current-operated circuit-breaker is
300 mA
• supplying TN-S mains
• length of motor cable 20 m max. in shielded design
• use of a mains filter HNF01 or NFD03
• each residual-current-operated circuit-breaker only supplies one
HCS02 drive controller
• only Rexroth components and accessories including cables and filters
are used
Using Isolating Transformer to
Reduce Leakage Current in
Mains
HCS02 Drive Controllers with
Residual-Current-Operated
Circuit-Breaker
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