Install An Expansion Module; Close The Cover - Hach SC4200c Manual Básico Del Usuario

Figure 10 Connect the relays
Terminal Description
1 Relay 1, NC
2 Relay 1, common
3 Relay 1, NO
NC = normally closed; NO = normally open

4.3.5 Install an expansion module

Explosion hazard. This manual is only for installation of the unit in a non-hazardous location. For
installation of the unit in hazardous locations, use only the instructions and approved control drawing
provided in the hazardous location installation manual.
Expansion modules with analog outputs, analog inputs and Profibus communication are available for
the controller. Refer to the documentation supplied with the module for additional information.

4.4 Close the cover

Close the controller cover and make sure that the cover screws are tight to keep the environmental rating of the
After the power connections are made, install the high-voltage barrier. Make sure that the high-
voltage barrier is correctly put on the enclosure guides and fixed to the main PCBA. Refer to
on page 14.
Close the controller cover. Tighten the cover screws with a maximum torque of 1.4 Nm (12.4 in./lb).
Refer to Figure 7 on page 13.
18 English
Table 4 Wiring information—relays
W A R N I N G
N O T I C E
Terminal Description
4 Relay 2, NC
5 Relay 2, common
6 Relay 2, NO
Figure 8