Instructions

138
SYMPTOM CHECK ACTION REF.
No output. All displays and
indicators are blank.
Is the AC power cord defective?
Check continuity, replace
if necessary.
3.7
Is the AC input voltage
within range?
Check input AC 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 input AC voltage.
Connect to appropriate voltage source.
3.6
Output is present momentarily
but shuts off quickly. the display
indicates ”O”.
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 not to limit the output.
5.3.2
5.3.3
Output current will not adjust.
Front panel CV LED is on.
Is the unit in constant voltage
mode?
Check current limit and voltage settings. 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 wire connections
for noise and impedance effects.
Minimize the drop on the load wires.
3.9.4
3.9.8
No output. Display indicates
”O”
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.
5.3.2
No output. Front panel PROT
LED is blinking.
Display indicates ”EnA”
Check rear panel J3
Interlock Function.
5.7.2
Display indicates ”SO”
Check rear panel J3
Output Shut Off connection.
5.7.1
Display indicates ”Ot”
Check if air intake or exhaust are blocked.
Check if the unit is installed adjacent to
heat generating equipment.
5.3.6
Display indicates ”FOd” Check Foldback setting and load current. 5.3.4
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 until the
display turns off. Turn on the AC power
and press front panel REM button.
7.2.6
Table 11-1: Maintenance
11.7 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 will indicate that service is required. Fuse replacement should be made
by qualified technical personnel. Refer to Table 11-2 for a listing of the fuses.
Z200/400 Input AC fuse F101 250VAC, 10A, Fast acting
Z800 Input AC fuse F101 250VAC, 16A, Fast acting
Table 11-2: Internal Fuse