BASLER ELECTRIC DECS125-15 DIGITAL EXCITATION CONTROL SYSTEM

BASLER ELECTRIC DECS125-15 DIGITAL EXCITATION CONTROL SYSTEM

programmable input can be programmed to receive a contact input from an automatic transfer switch

(ATS). In addition, a programmable Battle Override function allows overriding of DGC-2020HD alarms

and protection functions. Each programmable input can be assigned a user-defined name for easy

identification at the front panel display and in fault records.

Output contacts include three dedicated relays for energizing an engine’s glow plugs, fuel solenoid, and

starter solenoid. An additional twelve programmable output contacts are provided.

Additional contact inputs and output contacts can be accommodated with an optional CEM-2020 Contact

Expansion Module. Contact Basler Electric for ordering information.

Automatic Transfer Switch Control (Mains Failure)

The DGC-2020HD has the ability to detect a mains failure via a single- or three-phase bus input. A mains

failure is established when any one of the following conditions are met:

• Any phase of bus voltage falls below the dead bus threshold

• Any phase of bus voltage is unstable due to overvoltage or undervoltage

• Any phase of bus voltage is unstable due to overfrequency or underfrequency

At this time, the DGC-2020HD starts enough generators to pick up the anticipated load and transfers the

load to the generators when predetermined conditions are met. The DGC-2020HD implements open or

closed breaker transitions to and from the mains. When the mains returns and is considered stable, the

DGC-2020HD transfers the load back to the mains and stops the engines. During closed breaker

transitions, the optional Auto Synchronizer synchronizes the generators to the mains before transferring

the load from generator power to utility power.

Device Security

Passwords provide access security for six distinct functional access areas: Read, Control, Operator,

Settings, Design, and Administrator. Each username/password is assigned an access area with access to

that area and each area below it. An administrator password provides access to all six of the functional

areas.

A second dimension of security is provided by the ability to restrict access for any of the access areas to

only specific communication ports. For example, you could set up security to deny access to control

commands through an Ethernet port.

Security settings affect read and write access. Refer to the Security chapter in the Configuration manual

for more information.

Communication

DGC-2020HD communication features include a mini-B USB port, RS-485 port, two copper Ethernet ports

or one fiber optic Ethernet port (optional), and SAE J1939 interface.

USB Port

The USB communication port can be used with BESTCOMSPlus® software to quickly configure a

DGC-2020HD with the desired settings or retrieve metering values and event log records.

RS485 Port

An RS485 communication port uses the Modbus™ communication protocol and enables remote control

and monitoring of the DGC-2020HD over a polled network. RS485 Modbus supports a single Modbus

Master only.

Ethernet Port(s)

Depending on style number, each DGC-2020HD is equipped with either dual copper (100Base-T)

Ethernet communication ports (style xxxxDxxxx) or a fiber optic (100Base-FX) Ethernet communication

port (style xxxxFxxxx).

Ethernet ports provide communications between the DGC-2020HD and a PC via BESTCOMSPlus or

other DGC-2020HDs in a network. An Ethernet connection to a PC running BESTCOMSPlus provides

remote metering, setting, annunciation, and control of the DGC-2020HD. Ethernet communication

between DGC-2020HDs allows for generator sequencing on an islanded system.

CAN Interface

The CAN (Control Area Network) interface provides high-speed communication between the DGC

2020HD and the engine control unit (ECU) on an electronically controlled engine. This interface provides

access to oil pressure, coolant temperature, and engine speed data by reading these parameters directly

from the ECU. When available, engine diagnostic data can also be accessed. The CAN interface

supports the following protocols:

• SAE J1939 Protocol - Oil pressure, coolant temperature, and engine speed data are received

from the ECU. In addition, DTCs (Diagnostic Trouble Codes) help diagnose any engine-related

failures. The engine DTCs are displayed on the front panel of the DGC-2020HD and may be

obtained using BESTCOMSPlus® software.

• mtu Protocol - A DGC-2020HD connected to a genset equipped with an mtu engine ECU

receives Oil pressure, coolant temperature, and engine speed data from the engine controller,

along with various alarms and pre-alarms that are mtu-specific. In addition, the DGC-2020HD

tracks and displays the active fault codes issued by the mtu engine ECU.