Basler Electric DGC-2020HD - Manual (Page 340)

330 9469300990 Rev B
CEM-2020 DGC-2020HD
Caution
By mating conductors of dissimilar metals, galvanic corrosion could
occur which may lead to signal loss.
Connectors and headers may contain tin- or gold-plated conductors. Tin-plated conductors are housed in
a black plastic casing and gold-plated conductors are housed in an orange plastic casing. Mate
connectors to headers of the same color only.
Connector screw terminals accept a maximum wire size of 12 AWG (3.31 mm 2 ). 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 91.
It is recommended 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 91. 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 and Contact Outputs
The CEM-2020 (Figure 204) has 10 contact inputs and 24 contact outputs. The CEM-2020H (Figure 205)
has 10 contact inputs and 18 contact outputs.
Note
To follow UL guidelines, a fuse must be implemented in the 2Adc
contact circuits (Outputs 5 through 16) of the CEM-2020H used in
hazardous locations. The suggested fuse size in Adc = (100/Contact
Voltage) with a maximum fuse size of 5 Adc.