Inteli NT MINT, SW Version 2.6, ©ComAp – November 2011
IGS-NT-MINT-2.6-Reference Guide.PDF
103
Sync/load control adjustment
Hint:
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% RPM
nom
,
Speed gov bias
~
100% RPM
nom
,
SpeedGovHiLim
~ 105% RPM
nom.
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
RPM
Volt [V]
Volt [V]
0 V
+10 V
- 10 V
Speed governor
voltage output
1500
0 V
- 10 V
1500
+10 V
Speed governor
voltage output
+ 5 % of nominal
+ 5 % of nominal
- 5 % of nominal
- 5 % of nominal
SpeedRegChar =
POSITIVE
SpeedRegChar =
NEGATIVE
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:
6) Set
Angle gain
. Synchroscope on the controller measure screen should move slowly and stop in “up“
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.
1) Set
#
SysLdCtrl PtM
= Baseload, set
Baseload
value to 30 % of Nominal power of one gen-set.
2) Set
Load gain
to the same value as
Slip freq 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 GCB is closed, gen-set load slowly increases to
Base load
value. Check that gen-set power is
positive (CT polarity!).