5-4 Accessory Troubleshooting
TP-5672 11/95
Test Switches
RefertoFigure 5-4forwiringdiagramfortheTestswitch.
Refer to Figure 5-5 through Figure 5-10 for the
troubleshooting flowcharts.
Description Of The Automatic/Test
Switch Accessories
The two-position test switch is described below:
D DD-06-F. Momentary, key-operated Automatic/
Test switch simulates a normal source failure.
The system operates automatically with switch in the
automatic position. Thetest position simulates a normal
source failure.
The three-position test switches are described below:
D DD-06-N. Momentary Test/Automatic/Engine-
Start switch
D DD-06-P. Momentary, key-operated Test/
Automatic/Engine-Start switch
The system operates automatically with switch in the
automatic position. Thetest position simulates a normal
source failure. The engine-start position starts the
generator set.
The four-position test switch is described below:
D DD-07-D. Maintained rotary style
Test/Automatic/Off/Engine-Start switch.
The system operates automatically with switch in the
automatic position. Thetest position simulates a normal
source failure. The off position prevents transfer switch
operation. Theengine-start positionstarts thegenerator
set.
Troubleshooting The Automatic/Test
Switch Accessory
NOTE
Pressing the Automatic/Test pushbutton causes the
generator set to start and run.
Press the Automatic/Test pushbutton for 15 seconds.
1. If the power supply board Test LED does not
illuminate,connectTB-DC1-24toTB-DC1-34.Ifthe
TestLEDilluminateswhenTB-DC1-24isgrounded,
checktheAutomatic/Testpushbuttonandthewiring
from the Automatic/Test pushbutton to the power
supply board. If the Test LED does not illuminate
when TB-DC1-24 is grounded, replace the power
supply board.
NOTE
When taking a voltage or resistance measurement at a
ribboncablepin,donotdisconnect theribboncablefrom
theboard. Useaneedlepointprobeto take thereadings
from the holes on the top side of the ribbon cable
connector.
2. If the power supply board Test LED turns on when
the Automatic/Test pushbutton is pressed, check
the Not-In-Automatic LED. If the Not-In-Automatic
LED does not turn on when the Automatic/Test
pushbutton is pressed, connect TB-DC1-9 to
TB-DC1-34.
a. If the Not-In-Automatic LED does not turn on
when TB-DC1-9 is grounded, check the P2
ribbon cable connection by performing the
following steps.
(1) Disconnect TB-DC1-9 from TB-DC1-34.
(2) Remove all power sources.
(3) Wait for 30 seconds.
(4) Makingsurenot tobendor breakany of the
pins,removetheP2ribboncableconnector.
(5) Inspect the pins on the P2 ribbon cable
connector.
(6) If any of the pins are bent, carefully bend
themback.If anyof the pinsarebroken,the
ribbon cable connector is defective.
Replace the ribbon cable.
(7) Carefully reconnect P2 ribbon cable
connector.
(8) If the Not-In-Automatic LED still does not
turn on when TB-DC1-9 is grounded,
replace the logic board assembly.
b. If the Not-In-Automatic LED turns on when
TB-DC1-9 is grounded but not when the
Automatic/Test pushbutton is pressed, check
the Automatic/Test pushbutton and the wiring
from the Automatic/Test pushbutton to the
power supply board.
3. If the power supply board Test LED and the
Not-In-Automatic LED both turn on when the
Automatic/Test pushbutton is pressed, but the
engine does not start, check the power supply
board Start LED. If the Start LED is not on, see
Section 4, Engine Will Not Start. If the Start LED
does come on, replace the power supply board.
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