Instruction manual

Instruction manual αlpha DO 2000
10
3.2 Connection Diagram
Caution: Ensure electrical mains are disconnected before proceeding.
1
L
2
N
Current
15
Current
13
OP2
14
16
OP1
17
3
4
5
6
22
HOLD
18 19 2120 23 24 25
7
8 9
10
11
PT1000
29
PT100/
26 2827 30 31 32 33
12
Fuse: 250V 315 mA
Time Delay
11
1
L
2
N
13 14
OP2
Curre nt
15 16
OP1
Curre nt
63
19
HOLD
1817 20 21
5
4
22 23 24 25
28
PT100/
7
2726
8
3029
9
PT1000
31
10
32
33
12
250 V 315 mA
Time Delay
Connections for wall mounting version
1. AC mains live wire 18. 12V output Power supply
2. AC mains neutral wire 19. Hold Function
3. AC mains protective earth wire 20. Hold Function
4. Relay A (SP 1) 21. Earth ground
5. Relay A (SP 1) 22. no connection
6. Relay B (SP 2) 23. no connection
7. Relay B (SP 2) 24. no connection
8. Wash relay 25. no connection
9. Wash relay 26. no connection
10. Alarm relay (NC) 27. no connection
11. Alarm relay common 28. Temperature ground
12. Alarm relay (NO) 29. Temperature Sense
13. 4-20 mA temperature output, +ve terminal 30. Temperature Input
14. 4-20 mA temperature output, -ve terminal (Short to terminal 29 if using 2- wire RTD)
15. 4-20 mA DO output, +ve terminal 31. no connection
16. 4-20 mA DO output, -ve terminal 32. DO input, Cathode, -ve terminal
17. 12V output ground 33. DO input, Anode, +ve terminal
IMPORTANT: The Alarm relay functions as an “Active Low” device i.e. it switches OFF
under Alarm condition. Therefore the Alarm display device should be connected to the ‘NC’
contacts of the relay (10 & 11).