14 9469200994 Rev —
Typical Connections DGC-2020ES
CEM-2020 Connections
The CEM-2020 (Contact Expansion Module) is an optional module that may be installed with the DGC-
2020ES. It is a remote auxiliary device that provides additional contact inputs and outputs for the DGC-
2020ES. This module interfaces to the DGC-2020ES via CAN, thus the CAN terminals are the only
common connections (Figure 10) between the DGC-2020ES and CEM-2020. Refer to the CEM-2020
chapter for more information.
Refer to Terminals and Connectors for details on DGC-2020ES CAN connections.
Figure 10. DGC-2020ES and CEM-2020 CAN Connections
Installation for CE Systems
For CE compliant systems, it may be required to route ac voltage and current sensing wires separately
from other wires.
Installation in an Ungrounded System Application
When the DGC-2020ES is controlling equipment that is part of an ungrounded system, it is recommended
that potential transformers be employed on the voltage sensing inputs to provide full isolation between the
DGC-2020ES and monitored voltage phases.
P0067-87
CEM-2020
DGC-2020ES
CANH
CANL
GND/SHIELD
GND
CANH
CANL
GND
CANH
CANL
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