9400200990 Rev I DGC-2020 CEM-2020 (Contact Expansion Module) 9-1
SECTION 9 • CEM-2020 (CONTACT EXPANSION
MODULE)
GENERAL INFORMATION
The optional CEM-2020 is a remote auxiliary device that provides additional contact inputs and outputs to
the DGC-2020.
FEATURES
CEM-2020’s have the following features:
• 10 contact inputs
• 24 output contacts
• Functionality of Inputs and Outputs assigned by BESTLogic+ programmable logic
• Communications via CANBUS
SPECIFICATIONS
Operating Power
Nominal: 12 or 24 Vdc
Range: 8 to 32 Vdc (Withstands cranking ride-through down to 6 Vdc
for 500 ms.)
Contact Inputs
The CEM-2020 contains 10 programmable inputs that accept normally open and normally closed, dry
contacts.
Time from a CEM-2020 input going high to:
Shutdown the generator via an alarm: 245 ms max
Close a relay on board the DGC-2020: 245 ms max
Output Contacts
Ratings
Outputs 13 through 24: 1 Adc at 30 Vdc, Form C, gold contacts
Outputs 25 through 36: 4 Adc at 30 Vdc, Form C
Communication Interface
CANBus
Differential Bus Voltage: 1.5 to 3 Vdc
Maximum Voltage: –32 to +32 Vdc with respect to negative battery terminal
Communication Rate: 250 kb/s
Type Tests
Shock
15 G in 3 perpendicular planes
Vibration
Swept over the following ranges for 12 sweeps in each of three mutually perpendicular planes with each
15-minute sweep consisting of the following:
5 to 29 to 5 Hz: 1.5 G peak for 5 min.
29 to 52 to 29 Hz: 0.036” Double Amplitude for 2.5 min.
52 to 500 to 52 Hz: 5 G peak for 7.5 min.
Ignition System
Tested in closed proximity to an unshielded, unsuppressed Altronic DISN 800 ignition system.
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