Earth (Ground) Current Function - ABB ACS800-07-0610-3 Hardware Manual

Earth (ground) current function

The control board (DSSB) measures the input currents of the diode supply unit. The
earth current function constantly monitors the sum of the phase currents. The chart
below describes the operation.
Is earth current
function active? 1)
above wake up level? 2)
No
selection ON for the
earth current function?
DSU trips to a fault, illuminates
earth fault LED and energizes
relay output (earth current
1) Function is inactive when the wake up level is set to NONE (default setting). See page 28.
2) See page 28
3) See page 28
For information on the LEDs, see the chapter
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START
No
Yes
Is earth current
Yes
Is fault trip
3)
Yes
DSU continues operation and
energizes relay output (earth
fault).
for setting/checking the wake up level of the earth current
for the fault trip selection (ON = fault trip, OFF = warning).
No
current warning).
Fault
DSU does not monitor earth
current.
function.
tracing.
Hardware description
33