DC motor - Siemens, s.r.o.

Installation and Assembly
[ID 532]
3.5.6 Internal equipotential bonding
General
The equipotential bonding between the protective-conductor terminal in the
terminal box and the motor housing is established via the terminal box fixing
screws. These screws are dimensioned and designed as an "equal-conductance
connection" in relation to the protective-conductor cross-section assigned to the
supply-cable conductor in accordance with DIN VDE 0530 Part 1 (IEC 60034-1).
Equipotential bonding
In order to ensure the current carrying capacity of the connection via the fixing
screws for the eventuality of a short-circuit, the following conditions must be
observed:
•= always use only original seals.
•= the contact points under the screw heads or under the spring washers must be
bare and protected against corrosion.
The standard terminal box cover mounting screws are adequate as a potential
bonding connection between the terminal box cover and terminal box itself.
Note
When carrying out installation work, take care that all equipotential bonding
connections remain effective.
[ID 533]
3.5.7 Connection to the power converter
General
The ratings specified on the rating plate must be observed for operation when
connected to a power converter.
Converter operation on a grounded-neutral system
Caution
When operating with a converter with current limiting without ground-fault
detection, protective-conductor currents up to 1.7 times the phase current can
occur in the event of a ground fault on the output side. Neither the PE conductors
of normally rated multi-core connecting cables nor the PE connecting points of
normal terminal boxes are suitable for this purpose. In this case it is necessary to
install an adequately rated parallel protective conductor, which must be connected
to the grounding terminal located on the motor housing. Use the supplied screws
SIEMENS AG T61160347010001 (DMHO V9)
3-14 Operating instructions 1GG6286-0NA4.-1VV1-Z