8.7.8 Underspeed
This alarm alerts the operator that a genset is running too slowly.
The alarm response is based on the engine speed as a percentage of the nominal speed. If the
engine speed drops below the set point for the delay time, then the alarm is activated.
Configure these parameters under Configure > Parameters > Engine > Protections > Underspeed #, where # is 1 or 2.
Table 8.32
Default parameters
Parameter Range Underspeed 1 Underspeed 2
Set point (lower than) 0 to 100 % of nominal speed 90 % 80 %
Delay 0 s to 3 min 5 s 1 s
Enable Not enabled, Enabled Not enabled Not enabled
Action Warning Warning
Inhibit(s) Engine not running Engine not running
8.7.9 Crank failure
The alarm response is based on the MPU/W/NPN/PNP input. This alarm is only available if the
magnetic pickup (MPU) has been chosen as the primary running feedback.
The timer starts when cranking starts (that is, when the Crank output is activated). The alarm is
activated if the set point has not been reached within the delay time.
Configure the parameters under
Configure > Parameters > Engine > Start sequence > Crank failure.
Table 8.33
Default parameters
Parameter Range Default
Set point (lower than) 1 to 400 RPM 50 RPM
Delay 0 s to 3 min 20 s
Enable Not enabled, Enabled Not enabled
Action Warning
DESIGNER'S HANDBOOK 4189340911K UK Page 314 of 521
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