DSE Model 5520 Automatic Mains Failure Control and Instrumentation System Operators Manual
5520 OPERATING MANUAL ISSUE 1 04/02/05 AM
23
3.4 ELECTRICAL TRIPS
Electrical trips are latching and stop the Generator but in a controlled manner. On initiation of the
electrical trip condition the module will de-energise the
‘
Cl
ose
Gener
at
or
’
Output to remove the
load from the generator. Once this has occurred the module will start the Cooling timer and allow
the engine to cool off-load before shutting down the engine. The alarm must be accepted and
cleared and the fault removed to reset the module.
AUXILIARY INPUTS
, if an auxiliary input has been configured as an electrical trip the appropriate
message will be displayed as configured by the user.
Example
Alarm
Electrical trip
Negative Phase
Sequence
The
f
ol
l
owi
ng
al
ar
ms
ar
e
conf
i
gur
abl
e
bet
ween
War
ni
ng,
Shut
down
and
El
ect
r
i
cal
Tr
i
p.
“
El
ect
r
i
cal
Tr
i
p”
i
s
t
he
f
act
or
y
def
aul
t
set
t
i
ng.
GENERATOR OVER CURRENT,
If the module detects a generator output current in excess of
the pre-set trip, a warning is initiated. If this high current condition continues for an excess period,
then the alarm is escalated to either a shutdown or electrical trip condition (depending upon
module configuration). For further details of the high current alarm, please see High Current
Shutdown Alarm.
Alarm
Electrical trip
High current
GENERATOR REVERSE POWER
,
if the module detects a generator reverse power current
i
n
excess
of
t
he
pr
e-
set
t
r
i
p
a
shut
down
i
s
i
ni
t
i
at
ed.
The
LCD
wi
l
l
i
ndi
cat
e
‘
GEN REVERSE
POWER
’
.
Alarm
Electrical trip
Gen Reverse
Power
GENERATOR SHORT CIRCUIT,
if the module detects a generator fault current in excess of the
pr
e-
set
t
r
i
p
a
shut
down
i
s
i
ni
t
i
at
ed.
The
LCD
wi
l
l
i
ndi
cat
e
‘
GEN SHORT CIRCUIT
’
.
Alarm
Electrical trip
Gen Short Circuit