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7
Selecting cooperation devices
When Sigma Control L is supplied by 230 V AC, the total current consumed by devices
connected to the Control Unit (through detector bus and indicator terminals) cannot exceed
1.5 A, while the current consumed at indicator terminals cannot exceed 1.15 A.
When Sigma Control L is supplied by 24 V DC, the total current consumed by devices
connected to the Control Unit (through detector bus and indicator terminals) cannot exceed
2.3 A, while the current consumed at indicator terminals cannot exceed 1.15 A.
The list of current values consumed by detectors connected to the unit is presented in its documentation.
Current demand for other devices, e.g. visual-acoustic indicators should be defined by referring to their
technical documentation.
Information on the types of cables required and the method for preparing the gas detection system
connections – see appendix [4].
Once the system is installed perform a load test – see section 8.4
Examples of correct and incorrect device selection are presented below:
Example 1:
Power supply
230 V AC
10 x detector PW-017-PG4-EC-LCD-AL-0-485-0-0-0-0,
current input 10 x 35 mA = 350 mA
6 x detector PW-044-SG4-EC-0-ALB-T-485-0-0-0-0,
current input 6 x 70 mA = 420 mA
1 x visual-acoustic indicator,
current input 1 x 250 mA = 250 mA
Current input for indicators:
250 mA < 1150 mA
Correctly
Total current input:
1020 mA < 1500 mA
Correctly
system configured
correctly
Example 2:
Power supply 230 V AC
10 x detector PW-044-SG4-PEL-0-ALB-0-485-0-0-0-0,
current input 10 x 70 mA = 700 mA
2 x visual-acoustic indicator,
current input 2 x 480 mA = 960 mA
Current input for indicators:
960 mA < 1150 mA
Correctly
Total current input:
1660 mA > 1500 mA
Incorrectly
system configured
incorrectly
Example 3:
Power supply 24 V DC
5 x detector PW-044-SG4-PEL-0-ALB-0-485-0-0-0-0,
current input 5 x 70 mA = 350 mA
2 x visual-acoustic indicator,
current input 2 x 600 mA = 1200 mA
Current input for indicators:
1200 mA > 1150 mA
Incorrectly
Total current input:
1550 mA < 2300 mA
Correctly
system configured
incorrectly
p. 33|38
User's Manual: POD-026-ENG R17
