Patol Limited
2.6
Operational Programmability - SIL Switch
An eight pole SIL switch is located within the unit which programs the unit’s operation. Most
of the various option features are for special applications, factory test, commissioning or
maintenance purpose.
A summary of the switch functions is as follows:-
2.6.1 LED Operation - Pole 1
Normally the internal LEDs will only illuminate on ‘Alarm’ signalling. In the case of
coincident (double knock) operation the LEDs only illuminate when both channels
have triggered. This is to obviate momentary increases in line current for single
channel operations. For factory test and maintenance purpose Pole 1 of the switch
allows the LEDs to individually illuminate irrespective of operating mode. Ref. table 1.
2.6.2 Channel AND / OR selection - Pole 2
The unit can operate such that detection by either sensor channel results on an
alarm output (single knock / OR operation). Alternatively the unit may be set an
alarm output only occurs on detection by both sensor channels (double knock /
coincident / AND operation). Refer to table 1 & 2.7.6.
2.6.3 Non-latching option. - Pole 3
The sensor channels normally latch on detection. A non-latching setting is available
for maintenance, factory test and special application analysis. Refer to table 1.
2.6.4 Auto Reset operation. - Pole 4
When in double knock mode an auto reset is applied after a preset delay .
This only occurs if only a single channel has operated within the delay time. If both
channels have operated then the auto reset is prevented. The delay time is in effect
the scan period for coincidence. An option to auto reset ‘AND alarms’ is provided for
maintenance test purpose. Refer to table 1, 2.6.5 & 2.7.6.
2.6.5 Auto Reset Delay (Scan Period) - Poles 5 & 6
The duration is set by these switch poles . Refer to table 2.
2.6.6 Sensitivity. - Poles 7 & 8
The unit detection level sensitivity is set by these switch poles. The range
approximates to 10 - 40
μ
W. Refer to table 3.
Pole
FUNCTION
1
OFF
Channel LED’s only illuminate on alarm
ON
Channel LED’s illuminate before Double Knock alarm
2
OFF
Double Knock - Coincident Output
ON
Single Operation - OR - Output
3
OFF
Latching Operation
ON
Non-latching Operation
4
OFF
Only single detections auto-reset after scan period
ON
All detections auto-reset after scan period
Pole
AUTO RESET DELAY - SCAN PERIOD
5 OFF
2.6s
OFF
1.3s
ON
0.9s
ON
0.6s
6 OFF
ON
OFF
ON
Pole
SENSITIVITY (A=Most : D=Least)
7 OFF
A
OFF
B
ON
C
ON
D
8
OFF ON OFF ON
Table 1.
Table 2.
Table 3.
Page 8 of 16
D1198 - Issue 1 - 25 September 2013
Series 5000 - Manual 5610