Generac 005031-2 - Manual (Page 17)

15
Section 3 - Operation
Liquid-cooled 25 kW Generators
This secondary function is only available with DIP
switch two in the OFF position (ATS - automatic
transfer switch application).
3.3 MANUAL TRANSFER AND
START-UP
To transfer electrical loads to the Standby
(EMERGENCY) power source side and start the
engine manually, refer to the Owner’s Manual of the
particular transfer switch.
3.4 ENGINE GOVERNOR GAIN
ADJUSTMENTS
Engine speed governing is also controlled by the
engine control board. The engine governor has been
set by the factory during final testing of the generator
and should not be adjusted.
If, however, adjustments are necessary, the following
procedure should be followed (Figure 3.2 and Section
3.8):
1. Move DIP switch 8 to the TEST mode (OFF posi-
tion).
2. Set all three potentiometers (pots) fully counter-
clockwise.
3. Under no load condition, increase the GAIN pot
as much as possible without causing instability.
4. Apply 1/4, 1/2, 3/4 and full load to the unit.
Decrease the GAIN pot if there is instability at any
load point.
5. Under full load condition, increase the stability
pot until the unit returns to 60 Hertz (or 50 Hertz
in 50 Hertz applications).
6. Reduce load to 3/4, 1/2, 1/4 and no load. Decrease
the stability pot if there is instability at any load
point.
7. Adjust differential pot to make the recovery to
load changes even faster and minimize load
change undershoot and overshoot. If it is set too
high, it may introduce oscillations at some load.
It can be set to zero (full CCW) if a small amount
causes oscillations at some load.
8. Leave DIP switch 8 in TEST mode.
Figure 3.2 — Engine Governor Adjustment
3.5 MANUAL RETRANSFER AND
SHUTDOWN
When utility power source voltage has been restored,
electrical loads may be transferred back to that
source and the generator can be shut down as fol-
lows:
• Verify that utility power supply voltage to the trans-
fer switch has been positively turned Off, using
whatever means provided (such as utility main line
circuit breaker).
• Set the generator’s main circuit breaker to its Off
or Open position.
• Let the generator engine run at no-load for a few
minutes, to stabilize internal unit temperatures.
• On the generator console, set the Auto/Off/ Manual
switch to Off. Wait for engine to come to a complete
stop.
• For transfer to utility position, refer to the Owner’s
Manual of the particular transfer switch.
• Turn on the utility power supply to the transfer
switch, using whatever means provided (such as a
utility main line circuit breaker). The utility power
source now powers the loads.