Siemens 6SL3210-1SE14-1UA0 [35/318] Using residual current devices

Siemens 6SL3210-1SE24-5AA0 [35/318] Using residual current devices
Mains connection and line-side power components
2.4 Using residual-current devices
Manual
Manual, 01/2011, 6SL3097-4AC10-0BP2
35
2.4 Using residual-current devices
Selectively tripping, AC/DC-sensitive residual-current devices (type B) can be used in
addition to the overcurrent protection devices.
NOTICE
Residual-current devices have to be installed if the power supply conditions in terms of
short-circuit power and loop impedance at the infeed point are not such that the installed
overcurrent protection devices will trip within the prescribed period if a fault occurs. Since
TT systems do not generally meet this requirement, residual-current devices must always
be installed for this type of system.
Residual-current-operated circuit breakers (RCD)
Residual-current-operated circuit breakers (RCD) prevent an excessively high touch current
being maintained.
DANGER
Residual-current-operated circuit breakers alone are not permissible to provide protection
against direct and indirect contact.
When using residual-current-operated circuit breakers, it should be noted that
It is only permissible to use a delayed tripping, selective AC/DC-sensitive residual-
current-operated circuit breaker, type B.
The max. permitted grounding resistance of the "selective protective device" must be
observed (83 Ω max. for residual-current devices with 0.3 A rated differential current).
Accessible parts of the Power Drive System and the machine must be connected to the
system's protective ground conductor.
The shielded motor cable must not be longer than 50 m.
A separate residual-current device must be used for each Power Module.
Only one residual-current device may be connected in series (cascading is not
permitted).
Switching elements (disconnector units, contactors) for connecting and disconnecting the
Power Drive System have a max. 35 ms delay time time between the closing/opening of
the individual main contacts.
If no residual-current-operated circuit breaker is used, touch protection can be ensured by
means of double insulation or by isolating the Power Module from the supply system via a
transformer.

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