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Port symbol
Terminal no. Terminal name
Description
Bus detector port
19
-
Negative indicator power supply terminal
20
+
Positive indicator power supply terminal
21
E
Cable shielding
22
A
Signal line A
23
B
Signal line B
Table 1: Terminal strip description
Default configuration for Sigma Control L Unit is presented below (see table 2).
I/O configuration / Parameters
Function / Parameter
No. of detectors
1
Relay outputs
R1
Warning 1 (no delay on/off, normally open NO)
R2
Warning 2 (no delay on/off, normally open NO)
R3
Alarm (no delay on/off, normally open NO)
Optical beacon active (sustained)
Acoustic indicator – deactivation time 30 s
DI
External alarm
Internal buzzer
ON
Deactivation time for alarm – 10 min
Deactivation time for fault – 8 h
GTW settings
Address:
1
Protocol:
Modbus RTU
Baud rate:
19200
Parity:
No parity bit (N)
No. of bits:
8
Password
Level 1
1000
Level 2
2000
Table 2: Sigma Control L Unit default configuration
4.1
Relay output fault
The Control Unit is provided with one relay fault output. This output can operate in one of the two statuses:
closed – when there is no fault in gas detection system, or open – when at least one fault has been detected
on one of the system devices or, when power supply is missing. Contact status is presented in figure
Figure 4: Fault relay contact status
1
After installing the Additional Extension Module
p. 10|38
User's Manual: POD-026-ENG R17
No fault
NO
NC
COM
F2
F1
Fault
NO
NC
COM
F2
F1
