Guardian Technologies 004988-4 Manual De Usuario

 14 

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).

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.

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.

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

 0 0

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 

transfer 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.

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.