63
SYMPTOM
CHECK
ACTION
REF.
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 current limit 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 current limit 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”
Over Voltage 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”
Check if air intake or
exhaust are blocked.
Check if the unit is installed
adjacent to heat generating
equipment.
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
nonfunctional.
Is the power supply in
Local-Lockout mode?
Turn Off the AC power and
wait unit 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
750W model
F301
F302,F304
20A 250VAC,FAST
2A 400VDC,NORMAL
Summary of Contents for PU100-7.5
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