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9. TROUBLESHOOTING
This section shows the typical phenomena that imply troubles.
Some phenomena may be solved by rechecking or in simple manner.
Contact the nearest our distributor for phenomena that rechecking or
countermeasures may not eliminate or improve. Never detach the
case to check the inside.
Phenomenon
Possible cause
Check & countermeasures
Power is not turned
on even by throwing
the POWER switch.
・
AC power cable is broken
or has poor contact.
・
Check connection or replace the cable.
・
Input fuse has blown.
・
Input voltage is out of the allowable range.
“----“ is displayed after
starting operation.
The unit is specified as a
slave unit.
Specify the unit as the master unit. See
Section
“5-5-10. Master/slave function”.
“OHP” is displayed
after starting operation.
The OHP function works.
Check the ambient temperature, air
intake and exhaust ports and dust filter.
Display
disappears
in short time after
starting operation.
The fan is stopping.
Check the fan.
No output is given
even when the
OUTPUT key is
pressed.
・
The set voltage is
“0V”.
・
See Section
“5-4-1. How to set voltage”.
See Section
“5-7-2. Constant-voltage
control with external voltage or resistance
”.
・
The set current is
“0A”.
(In the CC status)
・
See Section
“5-4-2. How to set current”.
See Section
“5-7-3. Constant-current
control with external voltage or resistance.
”
・
On/Off with the external
contacts is selected.
・
See Section
“5-7-4. Output On/Off with
external contacts
”.
・
The channel output key is
not selected or an incorrect
channel is selected for
output.
・
See Section
“5-4-5. How to output”.
・
Keys are locked.
・
See Section
“5-4-8. How to invalidate
on-panel operations
”.
“OVP” is displayed
when the OUTPUT
key is pressed.
・
The OVP value is too low.
・
See Section
“5-5-2. OVP/OCP function”.
・
The sensing wire(s) is/are
disconnected.
・
See Section
“5-6. Voltage Remote
Sensing
”.
・
The resistor is open in the
external resistance control
mode.
・
See Section
“5-7-2. Constant-voltage
control with external voltage or
resistance
”.
“OCP” is displayed
when the OUTPUT
key is pressed.
・
The OCP value is too low.
See Section
“5-5-2. OVP/OCP function”.
Cannot
raise
the
current up to the set
current value.
CP (constant-power)
operation is carried out,
or the CP value is too low.
See Section
“5-4-3. How to set power”.
Output is unstable.
Oscillating due to
influences of the load.
・
Twist the load or sensing wires, or
change the wire layout.
・
Connect a capacitor at the output end
of the power source or the load end.
Output voltage does
not fall.
The Hi-
Ω
function is
activated.
See Section
“5-5-3. Hi-
Ω
function
”.
