9-4 DGC-2020 CEM-2020 (Contact Expansion Module) 9400200990 Rev I
Connections
Contact Expansion Module connections are dependent on the application. Incorrect wiring may result in
damage to the module.
Terminations
The terminal interface consists of plug-in connectors with screw-down compression terminals.
CEM-2020 connections are made with one 5-position connector, two 18-position connectors, and two 24-
position connectors with screw-down compression terminals. These connectors plug into headers on the
CEM-2020. The connectors and headers have dovetailed edges that ensure proper connector orientation.
The connectors and headers are uniquely keyed to ensure that the connectors mate only with the correct
headers. Connector screw terminals accept a maximum wire size of 12 AWG. Maximum screw torque is 5
inch-pounds (0.56 N•m).
Operating Power
The Contact Expansion Module operating power input accepts either 12 Vdc or 24 Vdc and tolerates
voltage over the range of 6 to 32 Vdc. Operating power must be of the correct polarity. Although reverse
polarity will not cause damage, the CEM-2020 will not operate. Operating power terminals are listed in
Table 9-1.
It is recomme
nded that a fuse be added for additional protection for the wiring to the battery input of the
Contact Expansion Module. A Bussmann ABC-7 fuse or equivalent is recommended.
Table 9-1. Operating Power Terminals
Terminal Description
P1 (SHIELD)
Chassis ground connection
P1 + (BATT–) Negative side of operating power input
P1 – (BATT+) Positive side of operating power input
Contact Inputs
The Contact Expansion Module has 10 contact inputs. Contact input terminals are shown in Figure 9-2.
Output Co
ntacts
The Contact Expansion Module has 24 output contacts. Output contact terminals are shown in Figure 9-2.
NOTE
Operating power from the battery must be of the correct polarity. Although
reverse polarity will not cause damage, the CEM-2020 will not operate.
Be sure that the CEM-2020 is hard-wired to earth ground with no smaller than 12
AWG copper wire attached to the chassis ground terminal (P1 ) on the module.
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