3-1
Troubleshooting Guide
TP-5672 11/95
Section 3. Troubleshooting Guide
For location of pushbuttons, switches, LEDs, and keys
referred to in this section, see Figure 2-1. Refer to
Figure 3-1 as a guide to troubleshooting problems with
the microprocessor logic controller. Refer to Figure 3-2
as guide to troubleshooting problems with the
microprocessor accessories.
Problem
Refer to Section 4— Controller Troubleshooting
None of the LEDs are on and the LCD is blank
Power to the system
Pressing a key on the keypad does not supply the appropriate
response
Keypad and status panel
Every LED does not turn on and every character block on the LCD
does not blacken
Keypad and status panel
The normal source should be available but the Source-Available,
Normal LED is not on
Source-available, normal error
The emergency source should be available but the
Source-Available, Emergency LED is not on
Source-available, emergency error
The Automatic/Test pushbutton is pressed, the Automatic/Inhibit
switch (option DD-09) is set to Inhibit, or the Automatic-Transfer key
switch (option DD-29) is set to manual, but the System-Status,
Not-In-Automatic LED is not flashing
System-status, not-in-automatic error
The System-Status, System-Alert LED is flashing; check the LCD
for a message
System-status, system-Alert error
The LCD displays Auxiliary-Switch Fault or Double Auxiliary--Switch
fault message
Auxiliary-switch fault or double auxiliary-switch fault error
message
The LCD displays Transfer Hang error message
Transfer hang error message
The LCD displays Power-Down error message
Power-down error message
The LCD displays RAM or Memory error message
RAM or memory error message
The Programming-Mode-Not-In-Off LED is flashing
Programming-mode-not-in-off
The engine operates when it should not be operating
Engine operates when it should not
The engine should start
Engine will not start
One of the control options is not working (the control options
include the inphase monitor, source-phase-sequence,
normal/emergency voltage/frequency sensing, plant exerciser,
extended time delay, and manual override)
Shunt-jumpered controlled options
Figure 3-1. Microprocessor logic controller troubleshooting chart
