DSE Model 5520 Automatic Mains Failure Control and Instrumentation System Operators Manual
5520 OPERATING MANUAL ISSUE 1 04/02/05 AM
20
OVERSPEED
, if the engine speed exceeds the pre-set trip a shutdown is initiated. Alarm
Shutdown Overspeed will be displayed. Overspeed is not delayed, it is an
immediate shutdown
.
Alarm
Shutdown
Overspeed
NOTE:-During the start-up sequence the overspeed trip logic can be configured
to allow an extra trip level margin. This is used to prevent nuisance tripping on start-
up
- Refer to the 55xx series configuration software manual under heading
‘
Overspeed
Overshoot
’
f
or
det
ai
l
s.
UNDERSPEED
, if the engine speed falls below the pre-set trip after the Safety On timer has
expired, a shutdown is initiated. Alarm Shutdown Underspeed will be displayed.
Alarm
Shutdown
Underspeed
GENERATOR HIGH FREQUENCY,
if the module detects a generator output frequency in excess
of the pre-set trip a shutdown is initiated. Alarm Shutdown High Frequency will be displayed, it is
an
immediate shutdown
.
Alarm
Shutdown
Over frequency
GENERATOR LOW FREQUENCY
, if the module detects a generator output frequency below the
pre-set trip after the Safety On timer has expired, a shutdown is initiated. Alarm Shutdown Low
Frequency will be displayed.
Alarm
Shutdown
Under frequency
GENERATOR HIGH VOLTAGE,
if the module detects a generator output voltage in excess of the
pre-set trip a shutdown is initiated. Alarm Shutdown High Volts will be displayed, it is an
immediate shutdown
.
Alarm
Shutdown
AC Overvolts
GENERATOR LOW VOLTAGE,
if the module detects a generator output voltage below the pre-
set trip after the Safety On timer has expired, a shutdown is initiated. Alarm Shutdown Low Volts
will be displayed.
Alarm
Shutdown
AC Undervolts