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Table 9-3 Actions When a Failure is Suspected (Continued)
Category
Problem of
Refer to "Instruction Manual (Remote Control)" in the attached CD-ROM.
remote
control
Problem of
The product
CONTROL
cannot be
I/O
controlled by the
CONTROL I/O.
Problem of
Files in the USB
USB
memory do not
memory
appear on the
screen.
Problem at
The current
driving an
waveform is
inductive
abnormal (e.g.,
load (e.g.,
asymmetrical or
transformer)
excessive) when
the transformer
is connected as
the load and the
AC voltage is
output.
The output
overvoltage error
occurs for an
inductive load
(e.g.,
transformer).
Memory
The memory
function-
cannot be
related
recalled.
problem
DP420LS/DP480LS
Symptom
Possible Cause
The external control is
disabled.
The Remote state is set
by the communication
interface.
USB eject operation was
performed.
One folder contains over
500 files.
The format is illegal.
The output offset
voltage (DC component)
caused the load
transformer core to
reach the magnetic
saturation.
An abrupt change in the
output current generated
a back electromotive
force.
The output is on.
9.2 When a Failure is Suspected
Necessary Actions
Enable the external control.
4.18
The external control is disabled in
the Remote state.
Perform the USB eject operation
(4.9) again just in case, and
remove the USB memory.
Reconnect the USB memory and
make sure the file names are
displayed.
Reduce the number of files in a
folder to 500 or less.
Use a FAT32-formatted USB
memory.
In the AC mode, the control
function works to eliminate the
offset voltage (DC component).
When the product is used in the
ACDC mode, switch it to the AC
mode. 3.4.1
If it does not bring much
improvement, adjust the DC
offset. 4.14
When the output is off or the peak
current limiter is activated, the
load current may change abruptly,
which generates a back
electromotive force to cause the
output overvoltage error. To avoid
the abrupt current change, reduce
the setting value of the peak
current limiter sufficiently for a
smaller output current, or
conversely set it to a sufficiently
large value to disable the limiter
to be activated, or sufficiently
reduce the amplitude before
turning off the output. 4.1.1
The output on state does not allow
the recall. Turn the output off.
227
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