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Power Systems, Inc.

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 (EMER-
GENCY) power source side and start the engine man-
ually, refer to the Owner’s Manual of the particular
transfer switch.

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 governor
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 STABILI-

TY 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

3.5

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 follows:
• 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.

3.6

AUTOMATIC OPERATION

To set the system for fully automatic operation, pro-
ceed as follows:
• Check that load circuits are connected to the

utility power supply.

• Set the AUTO/OFF/MANUAL switch to its AUTO

position.

• Set the generator main circuit breaker to its ON or

CLOSED position.

3.7

WEEKLY EXERCISE CYCLE

The engine control board will start and run the gen-
erator once every seven days for approximately 12
minutes. If utility should fail during this exercise
period, the engine control board will transfer the load
to the generator output and continue to run until util-
ity returns.

PCB# 0E4906 REV.

R49

D17

C26

C27

R44

D19

C30

RL1

LED1

C21

D10