Honeywell SYA14 Series Manual page 552

MAXIMUM MUTING SEQUENCE DURATION
•
The duration of the muting sequence is voluntarily limited to avoid the
permanent mute of the protective equipment. The actuation of the 2 start muting
sensors SMs initiates a timing, and if this timing ends before the information
delivered by the 2 end muting sensors EMs are issued, then the muting sequence is
interrupted and the OSDs outputs of the muting module remains permanently open.
•
The selection of the appropriate mode of operation sets the maximum duration
of the muting sequence to the values given in chapter 2.4.2 SM inputs .
•
If this timing is exceeded, press and release the restart push-button to go back
to normal conditions of operation (refer to chapter 2.4.5 Manual restart of the
module).
•
In the conveyor mode, it may be necessary to press push- buttons P/B1 and
P/B2 to clear the detection field before restarting the module (see chapter 2.4.4
Override function).
2.4.2 SM inputs (start of a muting sequence) (switch ST3)
At least two auxiliary sensors are necessary to start a muting sequence. These two
sensors may be ultrasonic sensors, photoelectric controls, limit switches or inductive
proximity sensors. Correct operation of these sensors is monitored by the muting
module and a muting sequence is allowed if both sensor outputs switch ON within a
time frame set between tmin = 8ms and tmax = programmable from 1s to 8s.
Figure 2.3 : SM inputs timing diagram
t < t t < t < t
min min
SM1
SM1
SM2
SM2
Protection
Protection
(Muting is not
allowed) ∆t = 50 ms
tmin = 8 ms / tmax = programmable from 1 s to 8 s
18
t > t
max max
SM1
SM2
Protection
Muting
(muting is not
allowed
allowed)
107004-15 EN FR26 ROW 0899 Printed in France