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10.6
Troubleshooting
If the power supply appears to be operating improperly, use the Table 10-1 to determine whether
the power supply, load or external control circuits are the cause.
Configure the power supply for basic front panel operation and perform the tests listed in Safety &
Installation manual, Turn-On Checkout Procedure section to determine whether the problem can
be found with the power supply.
Table 10-1 provides the basic checks that can be performed to diagnose problems, and references
to relevant sections of this manual for further information.
SYMPTOM
No output. All displays and
indicators are blank.
Output is present
momentarily but shuts off
quickly. The display
indicates: AC FAULT.
Output voltage does not
adjust. Front panel CC
indicator is on.
Output voltage does not
adjust. Front panel CV
indicator is on.
Output current does not
adjust. Front panel CV
indicator is on.
Large ripple present in
output.
No output. Display indicates
OVP
No output.
CHECK
Is the AC power cord defective? Check continuity and replace if
Is the AC input voltage within
range?
Does the AC source voltage sag
when load is applied?
Is the unit in constant current
mode?
Output voltage cannot be
adjusted above OVP setting or
below UVL setting via the Front
Panel or communication.
Is the unit in constant voltage
mode?
Is the power supply in the
Remote sense? Is the voltage
drop on the load wire high?
Over Voltage Protection circuit
has tripped.
Display indicates SO
188
ACTION
necessary.
Check input AC voltage.
Connect to appropriate voltage
source.
Check input AC voltage.
Connect to appropriate voltage
source.
Check current settings and load
current.
Set OVP or UVL not to limit the
output.
Check the current and voltage
settings.
Check load and sense wire
connections for noise and
impedance effects.
Minimize the drop on the load
wires.
Turn off the AC power to the unit.
Check load connections.
If analog programming is used,
check if the OVP is set lower than
the output.
Check if the rear panel J1 Output
Daisy is in function.
REF.
Safety &
Installation
Manual (*)
Safety &
Installation
Manual (*)
Safety &
Installation
Manual (*)
2.4
2.9.2
2.9.3
2.3
2.4
Safety &
Installation
Manual (*)
2.2
2.9.2
2.11.1
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