Ground Fault Protective Function; Emergency Stop Devices; Ground Connections - ABB ACS 600 Hardware Manual

Safety Instructions
Ground Fault
Protective Function
Emergency Stop
Devices

Ground Connections

vi
ungrounded systems, or high resistance grounded power systems
(over 30 ohms). The main power will be connected to earth potential
through the EMC filter of the ACx 600 which may cause danger or
damage to the unit. Disconnect the EMC filter capacitors before
connecting the ACx 600 to ungrounded systems. For detailed
instructions on how to do this, please contact your local ABB
distributor.
The ACx 600 is equipped with an internal ground fault protective
function to protect the unit against ground faults in the drive, the motor
and the motor cable. This is not a personal safety or a fire protection
feature. The ground fault protective function of the ACx 600 can be set
to warning only by Parameter 30.17 for Standard Application Program
and Parameter 30.11 for Crane Application Program. The internal
ground (earth) fault protection is not in use in the 12-pulse supplied
units. For ACX 62x units, refer to the ACx 607 hardware manual
subsection labelled "Special ACx 6x7 units from 315 to 630 kW".
The EMC filter of the ACx 600 includes capacitors connected between
the power circuit and the chassis. These capacitors increase the
ground leakage current from the AC line through the ground (PE)
connection and may cause some ground fault current circuit breakers
to trip.
The person responsible for the overall design and operation of the
driven process must make sure that the installation includes
emergency stop devices and any other safety equipment that may be
needed. Pressing the STOP key on the Control Panel of ACx 600 does
not generate an emergency stop of the motor or separate the drive
from dangerous potential. A Line Contactor with provisions for a
remote power cut-off switch is available as a factory installed option for
the ACx 607. Cutting off power to the drive allows the motor to coast to
a stop.
The ACx 600 and adjoining equipment must be properly grounded.
The ACx 600 and the motor must be grounded at the installation site to
ensure personnel safety in all circumstances and in addition to reduce
electromagnetic emission and pick-up. Make sure that grounding
conductors are adequately sized as required by safety regulations.
In CE compliant installations and in other installations where EMC
emissions must be minimized, 360 degree high frequency grounding of
cable entries is done in order to suppress electromagnetic
disturbances. In addition, power cable shields must be connected to
the ground (PE) in order to meet safety regulations. Power cable
shields are suitable for use as equipment grounding conductors only
when the shield conductors are adequately sized as required by safety
regulations.
601/604/607 US Supplement