IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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3) To start RPM matching press GCB ON/OFF button. GCB LED starts flash to indicate RPM
matching. To stop synchronization press again GCB ON/OFF .
Slip control adjusting:
4) Adjust RPM gain to unstable speed control and decrease value by 30 % to RPM insure stable
performance.
5) Adjust RPM int to stable (fast and smooth) slip control.
Load control adjustment
1) Set Load control = Baseload, set Baseload value to 30 % of nominal load.
2) Set Load gain to the same value and sign (polarity) as RPM gain. Set Load int to zero.
3) Start the gen-set in MAN Mode, press GCB ON/OFF button to synchronize and close gen-set to
mains.
4) When is GCB closed, gen-set load slowly increases to Base load value. Check that gen-set power is
positive (CT polarity !).
5) Increase Load gain to unstable load control and decrease value by 30 % to insure stable
performance. When Load int factor is set to zero gen-set load can differ from required baseload.
6) To adjust and optimize Load int change several times Base load between 30 and 70 % of nominal
power.
7) When gen-set is running full load check if
a. The governor output voltage value is not limited (not near to ± 10V)
b. Speed governor actuator isn’t mechanically limited or operates in small section of throttle
range.
Active and reactive power terminology
MAINS GEN
LOAD
MAINS LOAD GEN
P > 0 Import P > 0 Consumption P> 0 Generation
Q> 0 Import Q> 0 Consumption Q> 0 Generation
Cos > 0 C
Consumption P
Capacitive LOAD
Cos > 0 L
Consumption P
Inductive LOAD
P
Q
Cos < 0 L
Export P
Import Q
Cos < 0 C
Export P
Export Q
Cos > 0 C
Import P
Export Q
Cos > 0 L
Import P
Import Q
P
Q
Cos < 0 L
Consumption P
Generation Q
Cos < 0 C
Consumption P
Consumption Q
Cos > 0 C
Generation P
Consumption Q
Cos > 0 L
Generation P
Generation Q
P
Q
Mains
Exported active power is supplied to the mains. It is displayed in negative numbers e.g. –20kW.
Imported active power is consumed from the mains. It is displayed in positive numbers e.g. +20kW.
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