
324
9440300990 Rev J
Contact Expansion Module
DECS-250
Caution
By mating conductors of dissimilar metals, galvanic corrosion could
occur which deteriorates connections and leads to signal loss.
Connector screw terminals accept a maximum wire size of 12 AWG. Maximum screw torque is 5 in-lb
(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 44.
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 44. 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 188) has 10 contact inputs and 24 contact outputs. The CEM-2020H
(Figure 189) has 10 contact inputs and 18 contact outputs.
Note
To follow UL guidelines, a fuse must be implemented in the 2Adc
contact circuits (Outputs 12 through 23) of the CEM-2020H used in
hazardous locations. The suggested fuse size in Adc = (100/Contact
Voltage) with a maximum fuse size of 5Adc.
Содержание DECS-250
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Страница 20: ...4 9440300990 Rev J Introduction DECS 250 ...
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Страница 108: ...92 9440300990 Rev J Power System Stabilizer DECS 250 Figure 85 PSS Function Blocks and Software Switches ...
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Страница 126: ...110 9440300990 Rev J Mounting DECS 250 Figure 103 Overall and Projection Mounting Dimensions ...
Страница 127: ...9440300990 Rev J 111 DECS 250 Mounting Figure 104 DECS 250 Escutcheon Plate Dimensions ...
Страница 128: ...112 9440300990 Rev J Mounting DECS 250 Figure 105 Panel Cutting and Drilling Dimensions for DECS 250 Panel Mounting ...
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Страница 316: ...300 9440300990 Rev J Specifications DECS 250 ...
Страница 334: ...318 9440300990 Rev J Analog Expansion Module DECS 250 ...
Страница 341: ...9440300990 Rev J 325 DECS 250 Contact Expansion Module Figure 188 CEM 2020 Input Contact and Output Contact Terminals ...
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