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ed direct fault currents that can be produced in power supply units,
mains rectifiers and drive controllers with power converters in B6 circuit,
the residual-current-operated circuit breaker is not triggered. This blocks
the triggering of a residual-current-operated circuit breaker sensitive to
power pulse current in the case of ground contact, i.e. in the case of
error.
Residual-current-operated circuit breakers sensitive to power pulse cur‐
rent do not provide any protection against inadmissible contact voltage.
2.
Residual-current-operated circuit breakers sensitive to universal current
(type B acc. to IEC 60755)
These circuit breakers are suited for smoothed direct fault currents, too,
and safely switch off devices with B6 input rectifiers.
If a current with 30 mA triggers the residual-current-operated circuit
breaker, it is possible to use a residual-current-operated circuit breaker
with a higher tripping 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 im‐
proved (for example, by connecting current-compensated mains chokes
in the incoming circuit, increasing the inrush current limitation).
Using isolating transformer to re‐
duce leakage current in mains
If there is no improvement achieved and the residual-current-operated circuit
breaker, due to specific mains conditions on site, has to be used neverthe‐
less on the mains input side, connect an isolating transformer between mains
connection and power connection of the drive system. This reduces the leak‐
age current in the ground wire of the mains that is produced during normal
operation which allows the residual-current-operated circuit breaker to be
used. Connect the neutral point of the secondary winding of the isolating
transformer to the equipment grounding conductor of the drive system.
Adjust the ground-fault loop impedance to the overcurrent protective device
so that the unit can be switched off in the case of failure.
Before operating enable, check the correct function of the overcurrent protec‐
tion device 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 des‐
tined for permanent connection does not need residual-current-operated cir‐
cuit breakers.
According to IEC 60204‑1 and IEC 61800‑5‑1, the mains-side protection
against indirect contact, i.e. in the case of insulation failure, has to be provi‐
ded in a different way, for example by means of an overcurrent protection de‐
vice, protective grounding, protective-conductor system, protective separation
or total insulation.
Mains types
TN-S mains type
The TN-S mains type is the usual mains type in Europe.
Bosch Rexroth AG
DOK-INDRV*-HXX05******-PR02-EN-P
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Rexroth IndraDrive ML Drive Systems with HMU05
Combining the individual components
Содержание Rexroth HMU05.1N Series
Страница 1: ...Rexroth IndraDrive ML Drive Systems with HMU05 Project Planning Manual R911344279 Edition 02 ...
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