Quality Monitoring Instruments QMI MULTIPLEX Manual page 28

MULTI-CORE CABLE SIZING TABLE WHEN LESS THAN
10 ENGINE DETECTORS ARE USED
It is not necessary to use a 19 twisted pair cable between the CMU and the Multi-way Junction
Box if less than 10 Detectors are installed.
Below is a chart on how to select a multi-core cable. If fewer Detectors are to be used the
terminals to be wired in the Junction Box are as follows:
- drain connection (31) must always be used
- supply common (25) is used when only 3 or 4 Detectors are used
- supply common (25 and 26) are used when more than 3 or 4 Detectors are used
- supply + (27) is used when only 3 or 4 Detectors are used
- supply + (27 and 28) is used when more than 4 Detectors are used
- fan failure connections (29 and 30) are always used
- 12V Fan Failure connection (32) is always used
NOTE: For further wiring details turn to Part 2-17.
Numbers (25) to (32) refer to terminals.
No. of No. of
Detectors Twisted
Pairs
3 7
4 8
6 12
7 13
8 14
9 15
Installation Part2-14
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, EN4 8RW, UK. TEL +44 (0)20 7328 3121
Engine Oil Mist Detection System
MULTIPLEX
25 and 26 27 and 28
Supply
Common
Wire No. Pair Wire No.
No.
7 & 8 4 9 & 10
9 & 10 5 11 & 12
13 & 14 7 17 & 18
15 & 16 8 19 & 20
15 & 16 8 19 & 20
17 & 18 9 21 & 22
17 & 18 9 21 & 22
19 & 20 10 23 & 24
19 & 20 10 23 & 24
21 & 22 11 25 & 26
29 and 30 Fan
Supply Failure
+
Pair Wire No.
No.
5 11 & 12
6 13 & 14
9 21 & 22
10
10 23 & 24
11
11 25 & 26
12
12 27 & 28
13
32
12V Fan
Failure
Pair Wire No. Pair
No. No.
6 13 & 14 7
7 15 & 16 8
11 23 & 24 12
12 25 & 26 13
13 27 & 28 14
14 29 & 30 15
EM6/March 2015