IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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Export limit [ DISABLED / ENABLED ] (FV)
Protection against power export to the mains. The function limits gen-set requested power to hold import
power higher or equal to the setpoint Import Load.
Force value possibility: Yes
Derating1 strt [ X ] (FV)
Derating2 strt [ X ] (FV)
The starting values for the power derating function. The gen-set nominal power is decreased according to
the adjusted curve.
The setpoint actual physical dimension is given by the related analog input and the value assigned to it.
Step: 1 X
Range: ± 32000 X
Force value possibility: Yes
Hint:
DeratingX strt unit [X] depends on DeratingPowerX analog input unit.It can be e.g.°C in case of temperature
derating function.
Derating1 end [ X ] (FV)
Derating2 end [ X ] (FV)
Ending value for power limitation – at this value the gen-set power is limited to DeratedX pwr value and it
won’t go lower for higher input values.
The setpoint actual physical dimension is given by the related analog input and the value assigned to it.
Step: 1 X
Range: ± 32000 X
Force value possibility: Yes
Hint:
To record the power derating activity into the History:
- Configure the binary output Derating X act to a virtual periphery input.
- Configure either “History record” or “Warning”-type alarm to this input to record power
derating activity in History and optionally to indicate it in Alarmlist.
Derated1 pwr [ % ] (FV)
Derated2 pwr [ % ] (FV)
The ratio of decreasing of the gen-set nominal power at DeratingX end level.
Step: 1 % of Nomin power
Range: 0 - 100 % of Nomin power
Force value possibility: Yes
Hints:
DeratedX pwr = 90% means the nominal power reduction to 90%, not by 90%.
Derating ratio is set to zero and functions are not active when Analog inputs PowerDeratingX are not
configured (e.g. in default configuration).
When Power derating function is active, the generator nominal power is decreased to DeratedX pwr and so
Overload protection (BOC Overload) is based on this Derated power!
The generator nominal power is reduced according to the bigger restriction – the more reduced channel out
of the two.
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