ABB ACS800-02, Руководство по оборудованию

Страница: 32 / 128

Planning the electrical installation
32
Drive AC fuses (ACS800-07/U7 and ACS800-02/U2 with enclosure extension)
ACS800-07/U7 units and ACS800-02/U2 units with enclosure extension are
equipped with standard gG (US: T/L) or optional aR fuses listed in
Technical Data .
The fuses restrict drive damage and prevent damage to adjoining equipment in case
of a short-circuit inside the drive.
Operating time of the fuses
Check that the operating time of the fuse is below 0.5 seconds. The operating
time depends on the fuse type (gG or aR), supply network impedance and the cross-
sectional area, material and length of the supply cable. In case the 0.5 seconds
operating time is exceeded with gG (US: CC/T/L) fuses, ultrarapid (aR) fuses will in
most cases reduce the operating time to an acceptable level. The US fuses must be
of the “non-time delay” type.
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.
Ground fault protection
The drive is equipped with an internal ground fault protective function to protect the
unit against ground faults in the motor and the motor cable. This is not a personal
safety or a fire protection feature. The ground fault protective function can be
disabled with a parameter, refer to the appropriate
ACS800 Firmware Manual .
The EMC filter of the drive includes capacitors connected between the main circuit
and the frame. These capacitors and long motor cables increase the ground 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.
Note: Pressing the stop key ( ) on the control panel of the drive does not generate
an emergency stop of the motor or separate the drive from dangerous potential.
ACS800-02/U2 with enclosure extension and ACS800-07/U7
An emergency stop function is optionally available for stopping and switching off the
whole drive. Two stop categories according to IEC/EN 60204-1 (1997) are available:
immediate removal of power (Category 0 for ACS800-02/U2 and ACS800-07/U7)
and controlled emergency stop (Category 1 for ACS800-07/U7).