Symptom
Possible Cause
Explanation/Corrective Action
Load powers up but,
the “SYS” and “UV”
LEDs light red. The
“DC Load” LED will
not come on.
Programmable UV is set above
Zero volts
Set Programmable UV above Zero
volts.
Unit “Loads Off” by
itself. The “OV” and
“SYS” LEDs light .
The voltage applied to the loads
input has exceeded the voltage
limit setpoint, menu item
number 2.
The load detects DC input voltage
above its over voltage setpoint and
“Loads Off” for self-protection.
Measure the DC input voltage and
reduce as necessary.
Check the loads voltage limit
setpoint by pressing the menu
button until item 22 “Voltage
Limit” appears. This voltage limit
can set for zero to 105% of the
voltage range selected.
Unit “Loads Off” by
itself with no fault
lights.
The voltage applied to the loads
input has exceeded the
maximum voltage of the load
for its present range and then
reduced to within range, as
with a voltage spike.
The loads voltage detection circuit
is very fast and will “Load Off”
when a voltage spike above it’s
over voltage setpoint appears. The
fault lights do not latch they are
self-resetting. Measure for voltage
spikes at the loads input and
correct as necessary. Once the
input voltage is within range,
manually press the load on button
to resume operation.
XBL Series 404078 Rev P2.odt Page 37 Of 162
