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.
Set
point
Value
time
Delay
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.
0
Set
point
Value
time
t
delay
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