Generac Power Systems 005012-1 - Manual (Page 16)

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3.2.3 15 AMP FUSE
This fuse protects the control console’s DC control
circuit against electrical overload. If the fuse has
melted open because of an overload, engine crank-
ing and startup cannot occur. If the fuse needs to be
replaced, use only an identical 15-amp replacement
fuse. (Type AGC)
3.2.4 4.0 AMP INLINE FUSE
This fuse protects the battery charger against electri-
cal overload. If the fuse needs to be replaced, use only
an identical 4-amp replacement fuse (type AG).
NOTE:
This fuse will not remove the + battery input
power from the PCB when it opens. This means
the exercise timer will not be reset.
3.2.5 SET EXERCISE TIME SWITCH
This switch allows programming the generator to
start and exercise automatically. “See Weekly Exercise
Cycle.”
3.2.6 SYSTEM READY LED
The System Ready LED (green) has two main pro-
poses. First, the LED will be ON when the AUTO/
OFF/MANUAL switch is in the AUTO position, utility
is present, and there are no system alarms. This ON
state indicates the system is fully ready for automatic
operation.
The system ready LED will be OFF when the switch
is in the MANUAL or OFF positions.
The system ready LED is also used to indicate the
presence of utility sensing at the PCB when the switch
is either in the AUTO or MANUAL modes. The LED
will flash at the rate of 1/2 second on, 1/2 second off
if the utility sensing level is below the transfer back
threshold.
This secondary function is only available with dip
switch two in the OFF position (standard ATS appli-
cation).
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.
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3.4 ENGINE GOVERNOR
ADJUSTMENTS
Engine speed governing is also controlled by the
engine control board. Connector J2 on the engine
control board interfaces with a governor driver mod-
ule and the Bosch throttle body. The engine gover-
nor has been set by the factory during final testing
of the generator and, in most cases, should not be
adjusted.
If, however, adjustments are necessary, or a new
engine control board is installed in the generator, the
following procedure should be followed (Figure 3.2):
1. Set all three potentiometers (pots) fully counter-
clockwise.
2. Under no load condition, increase the GAIN pot
as much as possible without causing instability.
3. 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.
4. Under full load condition, increase the stability
pot until the unit returns to 60 Hertz (or 50 Hertz
in 50 Hertz applications).
5. Reduce load to 3/4, 1/2, 1/4 and no load. Decrease
the STABILITY pot if there is instability at any
load point.
6. 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.
Figure 3.2 — Engine Governor Adjustment
PCB# 0E4906 REV.
R49
D17
J2
C2
C26
U7
C27
R44
Q2
D19
C30
RL1
2
L3
LED1
C4
R 25
C9
C21
D10
J1
R48
R1
U1
RL2
1
2
3
4
UNUSED
GTS/ATS
50/60 HZ
POSITION 1
50/60 HZ
ON = 50 HZ
OFF = 60 HZ POSITION 2
GTS/ATS Select
ON = GTS
OFF = ATS (standard mode)
STABILITY
DIFFERENTIAL DIP SWITCH
0 0
Section 3 — Operation
40kW Liquid-cooled Generators