Short-Circuit Protection - ABB ACS800 Series Hardware Manual

Short-circuit protection

Protect the input cable and drive against short-circuit according to the following
guide lines.
Circuit diagram
DRIVE IS NOT EQUIPPED WITH INPUT FUSES
Distribution
Input cable
board
1)
1) Size the fuses according to local safety regulations, appropriate input voltage and
the rated current of the drive. Only gG and aR fuses are allowed, see section
cable fuses on page 117.
Standard gG fuses (US: CC or T for ACS800-U11) will protect the input cable in
short-circuit situations, restrict drive damage and prevent damage to adjoining
equipment in case of a short-circuit inside the drive.
Check that the operating time of the fuse is below 0.1 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 0.1 seconds
operating time is exceeded with gG fuses (US: CC/T/L), 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 chapter
Note: Circuit breakers must not be used.
Drive type
ACS800-11
Drive or drive
ACS800-U11
module
~
M
~
3~
Technical data.
Short-circuit
protection
Protect the drive and
input cable with fuses.
See footnote 1).
Planning the electrical installation
55
Mains