Sync/Load Control Adjustment - ComAp IG-NT GC Reference Manual

To judge optimal adjusting induce generator power jumps by SysBaseLoad change or by soft changes of
AVR DCout bias.

Sync/load control adjustment

H :
INT
Use isochronous speed governor.
Two wire shielded connection from IGS-NT SPEED GOVERNOR output (SG OUT, SG COM) to Speed
governor auxiliary input is recommended.
A full range change of the IGS-NT speed governor output (from SpeedGovLowLim to SpeedGovHiLim)
should cause 5-10% change of the engine speed (SpeedGovLowLim ~ 95% RPMnom, Speed gov bias ~
100% RPMnom, SpeedGovHiLim ~ 105% RPMnom.
IMPORTANT
Speed governor has to be adjusted for optimum performance before Sync / load control adjusting.
Check generator phase sequence before the first GCB connection.
RPM
1500
- 10 V
SpeedRegChar = POSITIVE
Before optimal Sync/load setpoints adjusting disconnect GCB OPEN/CLOSE output or set Phase window =
0 to avoid paralleling.
Synchronizer adjustment
1) Start the engine in MAN Mode.
2) Set the engine RPM by speed trim on speed governor or by Speed gov bias and SpeedGovLowLim and
SpeedGovHiLim to Nominal frequency.
3) To start synchronizing press GCB ON/OFF button. GCB LED starts to flash to indicate synchronization.
To stop synchronization press again GCB ON/OFF .
Slip control adjusting:
4) Adjust Freq gain to unstable speed control and decrease value by 30 % to insure stable performance.
5) Adjust Freq int to stable (fast and smooth) slip control. Synchroscope movement on the controller
measure screen should slow down and stop (in any position, because Angle control is off).
Angle control adjusting:
Set Angle gain. Synchroscope on the controller measure screen should move slowly and stop in "up"
6)
position. Set Angle gain to unstable value (synchroscope swings) and decrease value by 30 % to
insure stable performance.
Load control adjustment
Prior to Sync/Load control adjustment, the Volt/PF control has to be adjusted! Load control loop is active in
parallel to mains mode only (MCB feedback closed). Switch off other engines while adjusting.
Inteli NT GeCon-MARINE SPI, SW Version 3.2, ©ComAp – July 2015
IGS-NT-GeCon-MARINE-SPI-3.2.PDF
+ 5 % of nominal
Speed governor
voltage output
+10 V
0 V
Volt [V]
- 5 % of nominal
RPM
+ 5 % of nominal
1500 0 V
- 10 V
- 5 % of nominal
SpeedRegChar = NEGATIVE
Speed governor
voltage output
+10 V
Volt [V]
44