AEM-2020 Analog Expansion Module

• Eight analog inputs
• Eight resistance temperature device (RTD) inputs
• Two Type K thermocouple inputs
• Four analog outputs
• Inputs and outputs are configurable for 4 to 20 mA and 0 to 10 Vdc ranges
• Controller Area Network (CAN) communication protocol
• Compatible with DGC-2020, DGC-2020HD, DECS-250, DECS-250N, DECS-250E, and DECS-450

CEM-2020 Contact Expansion Module

• Ten dry contact inputs
• Twenty-four contact outputs with the CEM-2020
• Inputs and outputs programmable through BESTCOMSPlus® software
• CAN communication protocol
• Compatible with DGC-2020ES, DGC-2020, DGC-2020HD, DECS-250, DECS-250N, DECS-250E, and DECS-450

• Three-phase generator metering
• Up to two buses with three-phase voltage metering
• Three dedicated generator CTs with up to four auxiliary CTs
• Engine metering and genset control
• Standard generator protection includes 27, 59, 81O/U, 32, and 40Q
• Enhanced generator protection includes 46, 47, 51, 78, and 81ROCOF in 

addition to the standard generator protection elements

• Enhanced Plus Differential option includes neutral (87N) and generator 

phase (87G) differentials with the enhanced sensing option

• Resistive sender inputs for oil pressure and coolant temperature (analog 

senders are optional)

• Dual CAN bus ports: One for SAE J1939 engine ECUs and one for 

expansion modules

• Dual Ethernet ports (fiber Ethernet is optional)
• Load sharing of kW and kvars over Ethernet
• Soft loading/unloading with zero-power transfer capability
• Two analog inputs standard and up to four with analog sender option
• Governor and AVR bias outputs with the ability to be programmed as 

standard analog outputs

• Sixteen programmable contact inputs, 12 programmable contact 

outputs, three pre-programmed outputs (Prestart, Start, Run)

• Three programmable LEDs for customized annunciation
• Color touch screen LCD (optional)
• Connects to up to four AEM-2020 Analog Expansion Modules, six 

CEM-2020 Contact Expansion Modules, and one VRM-2020 Voltage 

Regulation Module

• Peak Shave and Import/Export power control modes maximize system 

efficiency during peak hours

• Load anticipation function improves speed recovery during large load 

application and rejection

• Various system breaker configurations provide the DGC-2020HD with 

the flexibility to control systems in a wide range of applications

• Automatic load shedding functionality ensures that a system will remain 

up, even if it’s at a reduced capacity

• Generator metering (includes three-phase mains)
• Engine and generator protection: 27, 32R, 40Q, 59, 81O/U
• Optional enhanced generator protection: 47, 51, 78, and 81ROCOF
• BESTCOMSPlus® Software

– Programming and setup

– Intuitive and powerful

– Remote control and monitoring

– Programmable logic

– USB communications

• Automatic transfer switch control
• Automatic synchronizer (optional)
• Exercise timer
• SAE J1939 engine ECU communications
• Automatic generator configuration detection
• Expandable functionality via add-on modules

– CEM-2020 Contact Expansion Module

– AEM-2020 Analog Expansion Module

• Multilingual capability
• Remote communications to Basler’s RDP-110 (remote display panel)
• Sixteen programmable contact inputs
• Up to 15 contact outputs: 3 contacts rated for 30 Adc and up to 12 programmable contacts rated for 2 Adc

• Generator control
• Engine and generator protection
• Automatic transfer switch control
• Automatic generator configuration detection
• Extremely rugged, fully-potted design
• Seven programmable contact inputs
• Three-phase mains fail detection (optional)
• SAE J1939 engine ECU communications (optional)
• Programmable analog engine senders
• Resistive sender inputs for oil pressure and coolant temperature (optional)
• Multilingual capability
• Remote annunciation with the Basler RDP-110C (remote display panel)
• Event recording (up to 30 events in nonvolatile memory)
• Start, run, and prestart relays and four programmable outputs
• Exercise timer
• Additional contact input/output module (CEM-2020) available to expand the capabilities of the DGC-2020ES
• Tier 4 compliance – symbol handling and alarm capabilities