Hach sc1000 - Manual (Page 146)

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A.4 Attach the external relay module
The external relay card provides 4 relays, each with one change-over contact. The relays
can switch maximum 250 VAC, 5A (UL, SPDT-CO, change-over). They can be
programmed for limits, status, timers, and special functions.
1. Remove power and disconnect all cable connections to the module.
2. Place the external relay module on the DIN rail to the right of the base module and
slide firmly against the base module (or other connected modules).
3. Make the appropriate connections as shown in Figure 77 and Table 50 .
4. Connect cables to the module and reconnect power from the instrument.
Figure 77 External relay module
Table 50 External relay module terminal assignments
Terminal Assignment Description
1 Normally opened contact 1/3 (NO)
Maximum switching voltage:
250 VAC;
125 VDC
Maximum switching current:
250 VAC, 5A
125 VAC, 5A
30 VDC, 5A
Maximum switching power:
1500 VA
150 W
2 Normally closed contact 2/3 (NC)
3 Not switched (COM)
4 Not used
5 Normally opened contact 5/7 (NO)
6 Normally closed contact 6/7 (NC)
7 Not switched (COM)
8 Not used
9 Normally opened contact 9/10 (NO)
10 Not switched (COM)
11 Normally closed contact 11/10 (NC)
12 Not used
13 Normally opened contact 13/14 (NO)
14 Not switched (COM)
15 Normally closed contact 15/14 (NC)
16 Not used