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Hardware description
33
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.
For information on the LEDs, see the chapter
Fault tracing
.
Is earth current
function active? 1)
Is earth current
above wake up level? 2)
DSU trips to a fault, illuminates
earth fault LED and energizes
relay output (earth current
fault).
DSU continues operation and
energizes relay output (earth
current warning).
Yes
START
No
DSU does not monitor earth
current.
No
Yes
Yes
Is fault trip
selection ON for the
earth current function?
3)
No
1) Function is inactive when the wake up level is set to NONE (default setting). See page
28
.
2) See page
28
for setting/checking the wake up level of the earth current function
.
3) See page
28
for the fault trip selection (ON = fault trip, OFF = warning).
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
Содержание ACS800-07-0610-3
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