YOKOGAWA av550g, User Manual

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< 10. Other Functions >
10-22
IM 11M12D01-01E
Table 10.5 When Auto Blow back conflicts with Other Processing
Other
Processing
Blow back
Purging
the
channel
Other
channel
CAL
Indication
Check in
other channel
Blow back
in other
channel
Maintenance Blow back
chan.
in warmup
status
Blow back
chan.
in ERR
status
Blow back
chan. now
disabled
Semi-auto
Blow back
x x x x x O x x
Auto
Blow back
Wait Wait Wait Wait Wait O x x
O
: Perform blow back
X : Cannot perform blow back
Wait : Wait until other ongoing command completion, and is executed.
10.5.4 Operation of Blow back
Figure 10.26 shows blow back timing. To execute blow back by a contact input, use it with an on-time
period of 1 to 11 seconds. Once blow back starts, the SV-CH contact output repeatedly opens and
closes at an interval of approximately 10 seconds during the preset blow back time. During the blow
back time and hold time on a channel, its individual analog output remains held at a value preset in the
Output hold setup and excluded from averaging group calculations. After the hold time has elapsed,
blow back is started on the next channel.
Ch1 Output hold
Ch 2 Output hold
Ch1 Blow back time
Ch 2 Blow back time
10 sec 10 sec
F10-26E.ai
Average output
Blow back start in
Blow back time
Ch1 Output Hold
On
Off
Solenoid valve switching
Blow back start
Off
On
Hold time
Blow back time
Ch2 Output Hold
Hold time
SV-CH1 contact
SV-CH2 contact
Ch1 removed from average Ch2 removed from average
Figure 10.26 Blow back Timing