TDK-Lambda G10-500 - 10.6 Troubleshooting Guide

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10.5 Parts Replacement and Repairs
As repairs are made only by the manufacturer or by authorized service facilities, no parts
replacement information is provided in the manual. In case of failure, unusual or erratic operation of
the unit, contact the TDK Lambda sales or service facility nearest you. Please refer to the TDK
Lambda sales offices address listings on the back cover of this user manual.
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 Section 3.7 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
CHECK
ACTION
REF.
No output. All displays and
indicators are blank.
Is the AC power cord defective? Check continuity and replace if
necessary.
3.6 (*)
Is the AC input voltage within
range?
Check input AC voltage.
Connect to appropriate voltage
source.
Safety
Instructions (*)
3.6 (*)
Output is present
momentarily but shuts off
quickly. The display
indicates:
AC FAULT
.
Does the AC source voltage sag
when load is applied?
Check input AC voltage.
Connect to appropriate voltage
source.
3.6 (*)
Output voltage does not
adjust. Front panel CC
indicator is on.
Is the unit in constant current
mode?
Check current settings and load
current.
3.3.5
3.3.6
Output voltage does not
adjust. Front panel CV
indicator is on.
Output voltage cannot be
adjusted above OVP setting or
below UVL setting via the Front
Panel or communication.
Set OVP or UVL not to limit the
output.
3.4.2
3.4.3
Output current does not
adjust. Front panel CV
indicator is on.
Is the unit in constant voltage
mode?
Check the current and voltage
settings.
3.3.5
3.3.6
Large ripple present in
output.
Is the power supply in the
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.
3.8.4 (*)
3.3
No
output. Display indicates
OVP
Over Voltage Protection circuit
has tripped.
Turn off the AC power to the unit.
Check load connections.
3.4.2