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Figure 12: Example of cable connection to the device
9.2.1
Connection of gas detector to a control unit
Detectors must be connected to a control unit by means of three-core cables terminated at appropriate
contacts. The recommended total resistance of all supplying cables should not exceed 7 (3.5 per a
single
core). The connection can be made by means of any cable that meets the foregoing condition, but due to
simplicity of installation it is recommended to use cables with as small cross-sections as possible, e.g. 3 x
0.5 mm
2
(see Section 8).
No.
Maximum resistance
of a single core [Ω]
Cross-section of a single
core [mm
2
]
Maximum cable length [m]
1
7
0.5
75
2
1
150
3
1.5
250
4
2.5
450
Table 15: Selection of cables for connections between gas detectors and a control unit
9.2.2
Connection of the ZMZ module to the EcoAlpa Control Unit
The ZMZ module must be connected to the control unit by means of a three-core cable so that the total
resistance of the cable is less or equal 0.2 Ω (0.1 Ω per a single core). The schematic diagram for the
connection is shown in Figure 11. The table below presents how to select cross section of cables
corresponding to the cable length.
No.
Maximum resistance
of a single core [Ω]
Cross-section of a single
core [mm
2
]
Maximum cable length [m]
1
0.2
1.00
5
2
1.50
8
3
2.50
13
Table 16: Selection of cables for connections between a Remote valve control module (ZMZ) and a control
unit
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User Manual: POD-017-ENG R01
Incorrect cable routing
Correct cable routing
Summary of Contents for EcoAlpa PW-054 Series
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