EIC derate with derating function
Using parameter 6241, 6251 or 6261, select EIC Derate request (SPN 3644).
To calculate the derated power, the AGC uses the value from the EIC in the derate function.
EIC derate using parameter 7551
Enable parameter 7551 to use the EIC value Engine Derate Request (that is, SPN 3644) as the derated power in the AGC. That is,
the EIC value is used directly, without a derate calculation.
6.8 Trip of non-essential load (NEL)
6.8.1 Trip of NEL
INFO
The two terms "trip of non-essential load" and "load shedding" describe the same function.
The trip of Non Essential Load (NEL) groups (load shedding) is carried out to protect the busbar against an imminent blackout due
to either a high load/current or overload on a generator set or a low busbar frequency.
The controller can trip three NEL groups due to:
• The measured load of the generator set (high load and overload)
• The measured current of the generator set
• The measured frequency at the busbar
The load groups are tripped individually. This means that the trip of load group 1 has no direct influence on the trip of load group 2.
Only the measurement of either the busbar frequency or the load/current on the generator set can trip the load groups.
Trip of the NEL groups due to the load of a running generator set will reduce the load on the busbar and thus reduce the load
percentage on the running generator set. This may prevent a possible blackout at the busbar caused by an overload on the running
generator set. The current trip will be selected in case of inductive loads and unstable power factor (PF <0.7) where the current is
increased.
Trip of the NEL groups due to a low busbar frequency will reduce the real power load at the busbar and thus reduce the load
percentage on the generator set. This may prevent a possible blackout at the busbar.
INFO
For output setup, please refer to the description of outputs.
6.9 Engine heater
This function is used to control the temperature of the engine. A sensor measuring the cooling water temperature is used to activate
an external heating system to keep the engine at a minimum temperature.
The set points adjusted in menu 6320 are:
• Set point: This set point +/- the hysteresis is the start and stop points for the engine heater.
• Output A: The relay output for the engine heater.
• Input type: Multi-input to be used for temperature measurement.
• Hysteresis: This decides how big a deviation from the set point is needed to activate/deactivate the engine heater.
• Enable: Enables the engine heater function.
DESIGNER'S HANDBOOK 4189341275A EN Page 125 of 196
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