92
83503001 Rev G
Table 9-1: Troubleshooting Guide
SYMPTOM
CHECK
ACTION
REF
Is the AC power cord defective?
Check continuity, replace if
necessary.
3.7
No output. All displays and indicators
are blank.
Is the AC input voltage within
range?
Check AC input voltage. Connect
to appropriate voltage source.
3.6
3.7
Output is present momentarily but
shuts Off quickly. The display
indicates “AC”.
Does the AC source voltage sag
when load is applied?
Check AC input voltage. Connect
to appropriate voltage source.
3.6
Output is present momentarily but
shuts off quickly.The display
indicates “OUP”.
Is the power supply configured to
Remote sense?
Check if the positive or negative
load wire is loose.
3.9.6
3.9.8
Output Voltage will not adjust. Front
panel CC LED is On.
Is the unit in constant current
mode?
Check Output Current setting
and load current.
5.2.1
5.2.2
Output Voltage will not adjust Front
panel CV Led is On.
Check if output voltage is adjusted
above OVP setting or below UVL
setting.
Set OVP or UVL so they will not
limit the output.
5.3
5.4
Output Current will not adjust. Front
panel CV LED is on.
Is the unit in constant voltage
mode?
Check Output Current and
voltage setting
5.2
Large ripple present in output.
Is the power supply in remote
sense?
Is the voltage drop on the load wire
high?
Check load and sense wires
connection for noise and
impedance effects. Minimize the
drop on the load wires.
3.9.4
3.9.8
No output. Display indicates “OUP”
Overvoltage Protection circuit is
tripped.
Turn off the AC power switch.
Check load connections. If
Analog Programming is used,
check if the OVP is set lower
than the output.
5.3
Check rear panel J1 ENABLE
connection.
5.8
Display indicates “ENA”
Setup switch SW1 setting.
4.4
Display indicates “SO”
Check rear panel J1 Output
Shut-Off connection.
5.7
Display indicates “OTP” (O7P)
Check if air intake or exhaust are
blocked. Check if the unit is
installed adjacent to heat
generating equipment.
5.12
No output. Front panel ALARM LED
is blinking.
Display indicates “Fb”
Check Foldback setting and load
current.
5.5
Poor Load regulation. Front panel
CV LED is on.
Are sensing wires connected
properly?
Connect the sense wires
according to User’s Manual
instructions.
3.9.8
The front panel controls are non-
functional.
Is the power supply in
Local-Lockout mode?
Turn Off the AC power and wait
until the display turns off. Turn on
the AC power and press front
panel REM/LOC button.
7.2.5
9.7.
Fuse Rating
There are no user replaceable fuses in the power supply. Internal fuses are sized for fault
protection and if a fuse was opened, it would indicate that service is required. Fuse
replacement should be made by qualified technical personnel. Refer to Table 9-2 for a
listing of the fuses.
Table 9-2: Internal Fuses
Fuse designation
1- Phase, 190-240Vac
3-Phase, 190-240Vac
3-Phase, 380-415Vac
INPUT FUSE
F301, F302:
30A, 600VAC, Fast Acting
F321, F322, F323:
20A, 600VAC, Fast-Acting
F651, F652, F653:
12A, 600VAC, Fast-Acting
F401, F402
5A, 400VDC, Normal-Blow
F501, F601
20A, 400VDC
