Issue 4
15
Expansion Unit Failure
The module detects the DSE Net link to the expansion module has failed or
communications to the expansion module has been lost
Generator kW Overload
The measured kW has risen above the configured trip level for a configured
duration.
Generator Over Frequency
The generator output frequency has risen above the trip alarm setting.
Generator Over Voltage
The generator output voltage has risen above the trip alarm setting.
Generator Under
Frequency
The generator output frequency has fallen below the trip alarm setting after the
Safety On timer has expired.
Generator Under Voltage
The generator output voltage has fallen below the pre-set alarm setting after the
Safety On timer has expired.
High Coolant Temperature
The module detects that the engine coolant temperature has exceeded the high
engine temperature trip alarm setting level after the Safety On timer has
expired.
Low Fuel Level
The level detected by the fuel level sensor is below the low fuel level trip alarm
setting.
Low Oil Pressure
The module detects that the engine oil pressure has fallen below the low oil
pressure trip alarm setting level after the Safety On timer has expired.
Oil Pressure Sensor Fault.
The module detects that the circuit to the oil pressure sensor has been broken.
Over Speed
The engine speed has risen above the over speed trip alarm setting.
Under Speed
The engine speed has fallen below the under speed trip alarm setting.
8.5 HIGH CURRENT SHUTDOWN
The overcurrent alarm combines a simple warning trip level with a fully functioning IDMT curve for
thermal protection. Alarm is set at Overload maximum limit.
8.5.1 IMMEDIATE WARNING
The
Immediate Warning
is enabled, the controller generates a
warning alarm
as soon as the
Trip
level is reached. The alarm automatically resets once the generator loading current falls below the
Trip
level. Alarm is set at Prime load maximum limit.
8.5.2 IDMT ALARM
If the
IDMT Alarm
is enabled, the controller begins following the IDMT ‘curve’ when the
trip
level is passed.
If the
Trip
is surpassed for an excess amount of time the
IDMT Alarm
triggers (
Shutdown
or
Electric trip
as
selected in
Action
).
High current shutdown
is a latching alarm and stops the Generator.
Remove the fault then press the
Stop/Reset Mode
button to reset the module.
High current electrical trip
is a latching alarm and stops the Generator.
Remove the fault then press the
Stop/Reset Mode
button to reset the module.
The higher the overload, the faster the trip. The speed of the trip is dependent upon the fixed formula:
T = t / ((IA / IT)
– 1) 2
Where: T is the tripping time in seconds
IA is the actual current of the most highly loaded line (L1 or L2 or L3)
IT is the delayed over-current trip point
t is the time multiplier setting and also represents the tripping time in seconds at twice full load (when IA / IT =
2).
Factory settings for the
IDMT Alarm
when used on a brushless alternator are as follows (screen capture from
the DSE Configuration Suite PC software :
IT (Trip setting value)
t (time multiplier)
