ABB DCS800 - IT (Ungrounded) Systems; Supply Voltage; Connecting the Power Cables

Electrical installation
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3ADW000194R0611 DCS800 Hardware Manual f us
IT (ungrounded) systems
Don’t use EMC filters.
The screen winding of dedicated transformers must be grounded.
For installation without low voltage switch (e.g. contactor, air-circuit-breaker) use
overvoltage protection.
The voltage shift of the isolated supply must not be larger than the voltage shift in
case on an earth fault.
Supply voltage
Check supply voltages of:
Aux X99
Fan Terminals
AC voltage for field circuit U1, V1, W1 (if used)
AC voltage for armature circuit U1, V1, W1
Connecting the power cables
Grounding and screening of power cables see manual Technical Guide, see
Reference
Cross sectional areas and tightening torques of power cable see chapter Planning
the electrical installation
V
U1
V1
W1
Voltage shift in
case of earth fault
Earth fault
earth fault volt shift.dsf