Omron S8M - Troubleshooting

122
Troubleshooting Section 8-1
8-1 Troubleshooting
If the S8M is not operating properly, check the items listed in the following
table before requesting repairs. If the problem cannot be remedied, contact
your OMRON sales representative.
Stage Observed problem Possible cause Remedy Reference
page
Installation The S8M was installed on a
DIN Rail, but the bottom of
the S8M is not attached.
The S8M's bottom latch is not
mounted properly.
Check that the S8M has been
pressed until the bottom latch
clicks.
37
Parameter
settings
The desired alarm value is not
being displayed.
The setting is not allowed in
the present protection level.
Change the protection level
setting.
54
The set value was changed,
but the change wasn't
accepted.
The new setting was not
saved.
After pressing the Up and
Down Keys to change the set
value, press the Mode Key
and verify that the setting
flashes and the setting is
saved.
56
The branch outputs are not
working.
All branch outputs are discon-
nected in the default settings
to ensure safety.
Switch to Test Mode and con-
nect the desired branch out-
puts.
74
When the S8M was switched
to Run Mode after setting the
overvoltage alarm and under-
voltage alarm, the alarm out-
put went OFF and cannot be
cleared.
The undervoltage and over-
voltage settings may have
been reversed.
Switch to Setting Mode from
the Mode Selection Menu and
check the settings.
49, 60, 61
Equipment
setup
The display is flashing “ON” in
Test Mode, but power is not
being supplied by the outputs.
A flashing “ON” display indi-
cates that the S8M is waiting
to turn ON the outputs.
If the Mode Key is pressed,
the output will be connected
and power will be supplied.
When power is being sup-
plied, “OFF” will flash on the
display to indicate the S8M is
waiting to turn OFF the out-
put.
77
The S8M was turned OFF in
Test Mode, and there was no
power from the outputs when
the S8M was turned ON
again.
If the power goes OFF in Test
Mode, all of the branch out-
puts are cut off for safety rea-
sons.
Connect the desired branch
outputs in Test Mode and then
switch to Run Mode or Setting
Mode before turning OFF the
power.
74
When the output is connected
in Test Mode, it is cut off
immediately and can't be con-
nected again.
Check whether the status
indicator is lit red. The current
may be higher than the abnor-
mal current tripping value.
Check for problems such as
output wiring and load con-
nection problems. If no prob-
lems are found, press the
Reset Key for at least 3 s.
74, 125
Operation The displayed temperature is
clearly different from the
ambient temperature.
The S8M detects the S8M's
internal temperature, which
can be 10 to 20°C higher than
the ambient temperature.
If the over-temperature out-
put is being used to control a
fan or cooling equipment, set
the over-temperature output
value based on the graph on
page 29.
29, 63
An alarm was output and the
cause of the alarm was elimi-
nated, but the alarm display
was not cleared.
The S8M doesn't disregard
temporary errors, so the dis-
play and output are main-
tained even after the cause of
the alarm is cleared.
The alarm can be cleared by
pressing the Reset Key for at
least 3 s.
125