Omron S8AS User Manual page 131

Troubleshooting
Observed problem
Operation The peak output current is not
displayed and the display
shows "- - -."
The peak output current is
higher than the abnormal cur-
rent tripping threshold, but the
output has not been cut off.
The output was not designed
for a current that high, but the
output is cut off as soon as
power is supplied.
Branch out- The connection cannot be
put cutoff reset immediately after it is
cut off (RST) is displayed.
The output was reset, but it
was immediately cut off
again.
Saving or The overheating alarm (A23/
maintenance HOT alternating display) can-
not be cleared.
All of the outputs were con-
nected when the parameters
were initialized.
Possible cause
The current may have
exceeded the measurable
range.
The S8AS provides a startup
delay so that inrush currents
do not cause tripping at star-
tup. The output will thus not
be cut off at startup, but the
maximum current will be
recorded as the peak output
current.
The abnormal current trip-
ping type may be set to
"instantaneous." With instan-
taneous detection, an abnor-
mal current is detected very
quickly and the output may be
cut off due to excessive cur-
rent during equipment opera-
tion.
There may be a large number
of devices connected to the
output. The more devices that
are connected, the higher the
operating current.
To protect the S8AS's internal
circuits, at least 15 seconds
must pass before a cut-off
output can be reset.
The original cause of the cut-
off may not have been elimi-
nated.
After resetting the error, a
large current may have flowed
again.
If the S8AS stays overheated
for more than 3 hours, the
overheat alarm cannot be
cleared because the life span
of the Power Supply can no
longer be calculated correctly.
Initializing parameters returns
all settings to their default val-
ues. All outputs are con-
nected by default.
Remedy
Clear the peak output current
in Run Mode.
Clear the peak output current
using the operation provided.
Thereafter, the peak output
current during normal opera-
tion will be recorded.
Either change the abnormal
current tripping type from
instantaneous to standard or
increase the current tripping
threshold.
Connect the devices to differ-
ent branch outputs and use
the S8AS's startup sequence
to offset the connections to
the devices.
Press the Reset Key for at
least 3 s. "RST" should be
displayed and the cut-off out-
put can be reset after 15 sec-
onds have passed since the
cutoff.
Eliminate the problem that
caused the cutoff and press
the Reset Key.
If the overheating alarm is dis-
played, be sure it is cleared
within 3 hours.
The S8AS will be in Run
Mode after initializing the
parameters. Change to Test
Mode and reset the required
branch outputs to ON (con-
nected) or OFF (discon-
nected).
Section 7-1
Reference
page
84
84
30
62
37, 66
30, 115
115
9
58
113