KEYENCE SJ-M200 - Manual (Page 10)

9
3-3
Alarm Output Functions
This section describes the alarm output functions of the SJ-M Series.
Alarm Output Functions
■ Alarm output function (ALARM)
The alarm indicator blinks (red) and an alarm signal
(control output (N.C.)) is output, for example, when
internal circuits are damaged or abnormal discharging
occurs. When an alarm signal is output, static
elimination is forcibly stopped.
Alarm output turns ON even in a static elimination
stopped state (including forced static elimination stop).
■ Ion level alarm output function (ION LEVEL)
The ion level alarm indicator lights and an alarm signal
(control output (N.O.)) is output when the level of
generated ions drops due to a dirty or worn electrode
probe, for example. When an alarm signal is output,
static elimination is not stopped.
Alarm output can be adjusted in three stages
according to the level of ions generated.
The default setting for the ion level alarm sensitivity
setting is Low.
The ion level alarm serves as a guideline for learning
when to perform maintenance on the electrode probe.
As static elimination is continued, be sure to turn the
power OFF before starting maintenance on the
electrode probe.
The ion level alarm output function is enabled in the
Run mode.
"Ion level alarm sensitivity setup" (page 7)
■ Condition alarm output function (COND)
The condition alarm output indicator lights and an
alarm signal (control output (N.O.)) is output when
static elimination performance is influenced by an
excessive charge on the target object. When an alarm
signal is output, static elimination is not stopped.
Alarm output can be adjusted in three stages
according to the installation environment. The default
setting for the condition alarm sensitivity setting is
Low.
The ion level alarm output function is enabled in the
Run mode.
"Condition alarm sensitivity setup" (page 7)
3-4 Other Functions
This section describes the abnormal discharge detection and static elimination stop functions of the SJ-
M Series.
Abnormal Discharge Detection Function
To prevent trouble, the generation of ions is stopped when abnormal discharging caused by
condensation on the electrode probe tips or adhesion of debris, for example, is detected. At this time,
the alarm indicator and ion monitor blink to inform you that an abnormality has occurred. For details of
the indicated state on the Controller Unit (operation/display section), see "During an alarm (level 2)"
(
page 14).
Static Elimination Stop Function
Static elimination only can be turned OFF in a powered ON state by two methods: by shorting the static
elimination stop input and 0V terminals on the Controller Unit (I/O terminal section), or by holding down
on the Controller Unit (operation/display section) simultaneously for about three seconds.
When static elimination stop input has been performed on the Controller Unit (operation/display
section), this state can be canceled by holding down
simultaneously for about three seconds.
For details on indication states on the Controller Unit (operation/display section) when static elimination
stop input is canceled, see "Static elimination stop input (operation/display section)" (
page 14).
■ Static elimination stop input
Static elimination is stopped by either of the following methods.
By operation on the Controller Unit (I/O terminal section):
Short the static elimination stop input and 0V
terminals to stop static elimination.
The center LED of the ion monitor blinks (red).
"Controller Unit (I/O terminal section)" (page
3)
To 24 VDC
power supply
To 24 VDC
power supply
3-4 Other Functions
By operation on the Controller Unit (operation/display section):
Hold down
simultaneously for about three
seconds to stop static elimination.
The three center LEDs of the ion monitor blink
(red).
Air Purge Function
Clean air, dry air must be supplied to the SJ-M010/020(G) from the Air Input Unit. The air purge
performs two roles. It prevents dirt from sticking to the electrode probe and extends the static
elimination area.
* The pressure value at the neck of the air duct is indicated as the air pressure.
Use clean air or dry air of temperature –25°C, and of mesh size of about 0.01 μm.
• Be sure to limit the air pressure to 0.5 MPa. Exceeding this limit may cause
accidents or malfunction.
• Be sure to use clean air, dry air as the air for supplying to the Static
Elimination Head. Moisture or oil contained in the air or nitrogen may cause
discharge inside the Static Elimination Head, which may result in accidents
or malfunction.
■ Relationship between air press and flow rate
The figure on the right shows the relationship
between the flow rate and pressure of the
supplied air.
Select an air compressor having sufficient
flow rate capacity referring to this figure
Hold down for
at least 3 seconds.
CAUTION
0
50
100
150
200
250
300
350
0 0.2 0.4 0.1 0.3 0.5 0.6
Air pressure [MPa]
Supply flow rate [NL/min]
SJ-M020G
SJ-M020G(1.2m)
SJ-M020G(0.6m)
SJ-M020
SJ-M020(1.2m)
SJ-M020(0.6m)
By cord length
0
50
100
150
200
250
300
350
0 0.2 0.4 0.6
SJ-M020G
SJ-M020G+SJ-MS2
SJ-M020G+SJ-MS1
SJ-M020G+SJ-MS3
SJ-M020G+SJ-MS4
SJ-M020G+SJ-ML
Air pressure [MPa]
Supply flow rate [NL/min]
0
50
100
150
200
250
300
350
0 0.2 0.4 0.6
SJ-M020
SJ-M020+SJ-MS2
SJ-M020+SJ-MS1
SJ-M020+SJ-MS3
SJ-M020+SJ-MS4
SJ-M020+SJ-ML
Air pressure [MPa]
Supply flow rate [NL/min]
By nozzle type (SJ-M020G) By nozzle type (SJ-M020)
3-4 Other Functions
■ Relationship between installation distance and static elimination speed
according to air flow rate
The relationship between static elimination
speed and installation distance between the
Static Elimination Head varies according to
the air flow rate.
Select an air supply flow rate referring to the
typical example on the right.
Measurement conditions:
Static elimination time in +1000V to +100V
range
150 mm x 150 mm plate monitor (20 pF)
used
0.00
0.50
1.00
1.50
2.00
2.50
3.00
4.00
3.50
0 150 250 50 100 200
Installation distance (mm)
Static elimination speed (secs)
20NL
60NL
250NL
SJ-M020
0.00
1.00
2.00
3.00
4.00
5.00
6.00
8.00
7.00
0 150 250 50 100 200
20NL
40NL
160NL
Installation distance (mm)
Static elimination speed (secs) 0.00
1.00
2.00
3.00
4.00
5.00
6.00
8.00
7.00
0 150 250 50 100 200
20NL
60NL
250NL
Installation distance (mm)
Static elimination speed (secs)
0.00
1.00
3.00
5.00
7.00
9.00
11.00
15.00
13.00
0 150 250 50 100 200
60NL
140NL
250NL
Installation distance (mm)
Static elimination speed (secs) 0.00
1.00
3.00
5.00
7.00
9.00
11.00
15.00
13.00
0 150 250 50 100 200
20NL
60NL
250NL
Installation distance (mm)
Static elimination speed (secs)
SJ-|M020+SJ-MS1 SJ-M020+SJ-MS2
SJ-M020+SJ-MS3 tube 500 mm SJ-M020+SJ-ML