C O R P O R A T I O N
TPCMQ DC/DC CONVERTER SERIES
OPERATING MANUAL
22
20.0 TROUBLESHOOTING GUIDE
20.1
If you encounter diffi culties in getting the converter modules or rack/shelf
to operate properly, go through the following troubleshooting guide.
20.2 Table 20-1. TPCMQ48/TPCMQ24 Converter System Troubleshooting
SYMPTOM
POSSIBLE CAUSE
ACTION TO TAKE
No output, Input Good and
Output Good LEDs off.
No input power.
Check connection to DC source.
Check DC source circuit breakers.
No output, Output Good
LED off, Input Good LED on.
Inhibit in OFF
mode.
Make sure J4 Pin 1 (Inhibit) is not
connected to Pin 23, -Sense, or to
ground.
No output, Output Good
LED off, Input Good LED on.
Shorted output.
Check for short and remove.
No output, Output Good
LED off, Input Good LED on.
Overvoltage pro-
tection (OVP) has
latched.
Reset output by cycling the DC input
OFF and then back ON.
No output, Output Good
LED off, Input Good LED on.
Overtemperature
protection is
activated on one
or more converter
modules.
Allow module to cool down for about
10 minutes. Check to see if the
cooling fans are operating.
Low or no output, Output
Good LED off, Input Good
LED on.
Output load is too
great for the num-
ber of converter
modules.
Reduce load to proper level.
