ABB ACS800-37-0060-3, Hardware Manual

Page: 65 / 228

Planning the electrical installation
65
Supply (AC line) cable short-circuit protection
Always protect the input cable with fuses. In networks with a short-circuit withstand
of 65 kA or less, standard gG fuses can be used. No fuses need be installed at the
drive input.
If the drive is supplied through busbars, fuses must be installed at the drive input. In
networks with a short-circuit withstand of less than 50 kA, standard gG fuses are
sufficient. If the network has a short-circuit withstand of 50…65 kA, aR fuses are
required.
Size the fuses according to local safety regulations, appropriate input voltage and
the rated current of the drive.
Check that the operating time of the fuses is below
0.5 seconds. For fuse ratings, see Technical Data .
WARNING! Circuit breakers are not capable of providing sufficient protection
because they are inherently slower than fuses. Always use fuses with circuit
breakers.
Earth fault (Ground fault) protection
Both the supply unit and the inverter unit are equipped with an internal earth fault
protective function to protect the drive against earth faults in the drive, motor and
motor cable. (This is not a personal safety or a fire protection feature.) Both earth
fault protective functions can be disabled.
See the ACS800 Ordering Information (code: 64556568 [English], available on
request) for other available earth fault protection options.
The EMC filter (if present) includes capacitors connected between the main circuit
and the frame. These capacitors and long motor cables increase the earth leakage
current and may cause fault current circuit breakers to function.
Emergency stop devices
For safety reasons, install the emergency stop devices at each operator control
station and at other operating stations where emergency stop may be needed.
Pressing the stop key (
) on the control panel of the drive, or turning the operating
switch of the drive from position “1” to “0” does not generate an emergency stop of
the motor or separate the drive from dangerous potential.
An emergency stop function is optionally available for stopping and switching off the
whole drive. Two modes are available: immediate removal of power (Category 0)
and controlled emergency stop (Category 1).
Restarting after an emergency stop
After an emergency stop, the emergency stop button must be released and a reset
performed before the main contactor (or air circuit breaker) can be closed and the
drive started.