*Note: The NEL function also trips NEL #. You cannot reconnect the NEL until the alarm is deactivated. The alarm action cannot be
changed.
4.7.5 NEL # overload
These non-essential load trips (NEL) are for overload protection. Tripping the NEL groups
reduces the active power load at the busbar, and thus reduce the load percentage on all the
running gensets. This can prevent a possible blackout at the busbar due to overloading the
running gensets.
The alarm response is based on the active power (all phases), supplied by the source, as
measured by the controller.
By default, up to six NEL trips are available. You can configure Overload 1 for three overload
trips, and Overload 2 for three fast overload trips.
These parameters are only visible if the non-essential loads are configured on the single line diagram.
Configure the parameters under Configure > Parameters > Non-essential load trip > Trip # > Overload 1, where # is 1, 2 or 3.
Table 4.23
Default overload NEL trip parameters
Parameter Range Trip 1 > Overload 1 Trip 2 > Overload 1 Trip 3 > Overload 1
Set point 10 to 200 % of nominal power 100 % 100 % 100 %
Time delay 0.1 s to 1 h 5.0 s 8.0 s 10.0 s
Enable Not enabled, Enabled Not enabled Not enabled Not enabled
Action* Warning Warning Warning
*Note: The NEL function also trips NEL #. You cannot reconnect the NEL until the alarm is deactivated. The alarm action cannot be
changed.
Configure the parameters under Configure > Parameters > Non-essential load trip > Trip # > Overload 2, where # is 1, 2 or 3.
Table 4.24
Default fast overload NEL trip parameters
Parameter Range Trip 1 > Overload 2 Trip 2 > Overload 2 Trip 3 > Overload 2
Set point 10 to 200 % of nominal power 110 % 110 % 110 %
Time delay 0.1 s to 100 s 1.0 s 1.0 s 1.0 s
Enable Not enabled, Enabled Not enabled Not enabled Not enabled
Action* Warning Warning Warning
*Note: The NEL function also trips NEL #. You cannot reconnect the NEL until the alarm is deactivated. The alarm action cannot be
changed.
Inhibits: The trips are inhibited if the breaker to the busbar is open.
DESIGNER'S HANDBOOK 4189340911K UK Page 122 of 521
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