4.7.3 NEL # over-current
These non-essential load trips (NELs) are for over-current protection. The over-current trip may,
for example, be activated by inductive loads and an unstable power factor (PF < 0.7), which
increase the current.
The trip response is based on the highest phase current true RMS values from the source, as
measured by the controller.
By default, up to three NEL trips are available.
Set
point
Value
time
Delay
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 #
>
Over-current
, where # is 1, 2 or 3.
Table 4.21
Default parameters
Parameter
Range
Trip 1 > Over-current
Trip 2 > Over-current
Trip 3 > Over-current
Set point
50 to 200 % of nominal current
100 %
100 %
100 %
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.
Inhibits: The trips are inhibited if the breaker to the busbar is open.
4.7.4 NEL # under-frequency
These NEL trips are for busbar under-frequency protection.
The trip response is based on the lowest frequency in the 3-phase voltage from the busbar, as
measured by the controller.
By default, up to three NEL trips are available.
Set
point
Value
time
Delay
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 # > Under-frequency
, where # is 1, 2
or 3.
Table 4.22
Default parameters
Parameter Range
Trip 1 > Under-frequency Trip 2 > Under-frequency Trip 3 > Under-frequency
Set point
70 to 100 % of nominal
frequency
95 %
95 %
95 %
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
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