1 about maintenance, About maintenance, 2 performing maintenance on the electrode probe – KEYENCE SJ-M300 User Manual
Page 11: Performing maintenance on the electrode probe, 1 timing charts, Timing charts, How to clean the electrode probe, How to replace the electrode probe, Ion generation control timing chart, Input response timing chart
10
4-1
About Maintenance
Maintenance must be performed periodically to ensure that the static elimination performance of the
SJ-M Series is fully demonstrated. Maintenance personnel should thoroughly read the descriptions
under "Safety Precautions" (
page 1), and perform maintenance paying attention to the following
points.
About Maintenance
• The SJ-M Series uses high voltage. Before starting maintenance, be sure to
turn the power OFF. Failure to do so might result in electric shock or
malfunction.
• Do not directly touch the electrode probe. Take
care not to touch these probes even if the
power is turned OFF. Directly touching these
probes may cause personal injury.
When the SJ-M Series is used for a long period of time, the electrode probe becomes dirty due to the
adhesion of dust and dirt.
If the ion level alarm indicator lights, clean the electrode probe. If the electrode probe is used in a dirty
or dusty state, static elimination performance can no longer be fully demonstrated, resulting in
accidents or malfunction. We recommend periodically cleaning the electrode probe (as a guideline,
once every two weeks in a regular operating environment though this depends on the installation
conditions).
If cleaning the electrode probe does not improve the static elimination performance, or the ion level
alarm indicator frequently lights, replace the electrode probe.
If I.C.C. is set to OFF, the ion level alarm can not be judged correctly.
WARNING
Important
4-2
Performing Maintenance on the Electrode probe
When the SJ-M Series is used for a long period of time, the electrode probe becomes dirty due to the
adhesion of dust and dirt.
If the electrode probe is used in a dirty or dusty state, static elimination performance can no longer be
fully demonstrated, resulting in accidents or malfunction. Be sure to periodically perform maintenance
on the electrode probe.
Performing Maintenance on the Electrode probe
• At the time of maintenance, turn the SJ-M Series OFF.
• Do not directly touch the electrode probe with your hands. Doing so may
cause personal injury. Pay attention to this when performing maintenance
on the electrode probe.
■ How to clean the electrode probe
Clean the electrode probe gently with a cotton
wool bud moistened with alcohol.
■ How to replace the electrode probe
If the static elimination performance of an electrode probe does not recover or the ION LEVEL indicator
is lit frequently after cleaning, the life of the electrode probemay be expired. In that case, replace the
electrode probe.
Use the tungsten electrode probe as spares for SJ-G Series.
Replace all the remaining electrode probes along with the bad one, regardless of whether the
remaining electrode probes are still in serviseable condition or not.
WARNING
5-1
Timing Charts
This section provides timing charts for SJ-M Series.
■ Ion generation control timing chart
Indicator states when static elimination is OFF
Normal static elimination OFF
The center LED of the ion monitor blinks (red).
■ Input response timing chart
Normally ON Normally OFF Normally ON Forced OFF Normally ON Normally OFF Normally ON
Static elimination
stop input (terminal)
ON
OFF
Static elimination
stop input (controller)
ON
OFF
Ion emission state
Unit indicator
Emitting
No emissions
Alarm output
ON
OFF
Forced OFF
Forced OFF
Normally ON
Normally OFF
Max. 15 ms
Max. 1 s
Static elimination
stop input (unit)
ON
OFF
Ion emission
state
Emitting
No emissions
Normal static elimination OFF
The three center LEDs of the ion monitor
blink (red).
5-1
Timing Charts
■ Ion level alarm output timing chart
■ Condition alarm output timing chart
■ Alarm output timing chart
Power
ON
OFF
Static elimination
stop input (terminal)
ON
OFF
Static elimination
stop input (controller)
ON
OFF
Alarm indicator
Blinking
OFF
Alarm output (N.C.)
ON
OFF
Ion emission
Emitting
No emissions
Ion level indicator
Max. 15s
Blinking
OFF
Ion level alarm
output (N.O.)
ON
OFF
When the ion level alarm is output,
removing the cause of the alarm can
restore the normal state. One way of
restoring the normal state is to
perform maintenance on the electrode
probe.
For
details
on
electrode
probe
maintenance,
see "Performing
Maintenance on the Electrode probe"
(
page 10).
Power
ON
OFF
Alarm indicator
Blinking
OFF
Alarm output (N.C.)
ON
OFF
Ion emission
Emitting
No emissions
Condition indicator
Blinking
OFF
Condition alarm
output (N.O.)
ON
OFF
Max. 15s
Static elimination
stop input (terminal)
ON
OFF
Static elimination
stop input (controller)
ON
OFF
When the condition alarm is output,
removing the cause of the alarm can
restore the normal state. One way of
restoring the normal state is to
improve the installation environment.
Power
ON
OFF
Static elimination
stop input
ON
OFF
Alarm indicator
Blinking
OFF
Alarm output (N.C.)
ON
OFF
Ion emission
Emitting
No emissions
Max. 15s
When the alarm is output, the normal
state can be restored by performing
one of the two available restore
methods depending on the cause of
alarm output.
For details on how to restore the
normal state, see “During an alarm
(levels 1, 2)” (
page 13).