4-13
Controller Troubleshooting
TP-5672 11/95
Sulfuric acid in batteries.
Can cause severe injury or death.
Use protective goggles and clothes. Battery acid can
cause permanent damage to eyes, burn skin, and eat
holes in clothing.
WARNING
Sulfuric acid in batteries can cause severe injury or
death.
Sulfuric acid in battery can cause permanent
damage to eyes, burn skin, and eat holes in clothing.
Always wear splash-proof safety goggles when working
around the battery. If battery electrolyte is splashed in
the eyes or on skin, immediately flush the affected area
for 15 minutes with large quantities of clean water. Seek
immediate medical aid in the case of eye contact. Never
add acid to a battery once the battery has been placed in
service. This may result in hazardous spattering of
electrolyte.
NOTE
When taking a voltage or resistance measurement
at a ribbon cable pin, do not disconnect the ribbon
cable from the board. Use a needle point probe to
take the readings from the holes on the top side of
the ribbon cable connector.
a. Check the voltage at P2-13. Using a voltmeter,
connect the positive test lead to P2-13. Connect
the negative test lead to TB-DC1-34. See
Appendix B, Figure B-6 for location and
description of P2 ribbon cable pins. Carefully
remove the power source by disconnecting the
in-line disconnect plug. Leave the power source
disconnected for six seconds. After six seconds
note the voltmeter reading.
b. If the voltage is less than six volts, replace the
power supply board.
c. If the voltage is greater than six volts, replace the
logic board assembly.
RAM Or Memory Error Message
If either a RAM ERROR or a MEMORY ERROR
message appear on the LCD, power down the logic
board for at least 30 seconds. Replace power to the logic
board. If either the RAM ERROR or MEMORY ERROR
message still appear on the LCD, the main logic board is
defective. Replace the logic board assembly.
Manual Transfer Message
The MANUAL TRANSFER message will appear on the
LCD when a transfer to the emergency source or to the
normal source is desired but the logic board is in the
manual mode. When this message appears press the
appropriate pushbutton: Manual Transfer-to-Emergency
or Manual Transfer-to-Normal. If automatic transfer is
desired instead of manual transfer, place the
automatic/manual transfer switch in the automatic
position.
Manual-to-Off Transfer Message
The MANUAL TO OFF message will appear on the LCD
when three conditions are met: 1) The transfer switch is
in either the emergency or normal position, 2) the logic
controller is in manual mode, and 3) the off position time
delay is enabled. When this message appears press the
MANUAL-TO-OFF pushbutton.