Basler Electric DGC-2020HD - Manual (Page 12)

2 9469300990 Rev B
Load Sharing
The DGC-2020HD provides analog outputs to the power system in the form of analog bias signals to the
voltage regulator and speed governor. A pulse width modulated (PWM) speed bias output is also
available. When the generator breaker is closed and load sharing is enabled, the DGC-2020HD shares
the real power load proportionally with other generators in the system. Load sharing can be implemented
on the Analog Load Share Line or through Ethernet communications. Reactive power (kvar) sharing is
accomplished through Ethernet communications.
Event Recording
A history of system events are logged in nonvolatile memory. The DGC-2020HD retains records for 128
unique types of events. Each record tracks the number of times that an event has occurred and records a
time stamp of the first and last occurrences.
A Sequence of Events (SER) log is also available. This log tracks the internal and external status of the
DGC-2020HD. Events are scanned at five millisecond intervals with 1,023 events stored per record. All
changes of state that occur during each scan are time- and date-stamped. Sequences of Events reports
are available through BESTCOMSPlus. Over 1,000 records can be retained in nonvolatile memory. When
the SER memory becomes full, the oldest record is replaced by the latest one acquired.
Data Logging
The data logging function of the DGC-2020HD records up to six records of user-selectable, real-time
parameter data. For more information, see the Reporting and Alarms chapter.
Contact Inputs and Outputs
DGC-2020HD controllers have 16 programmable contact inputs. All contact inputs recognize dry contacts.
The programmable inputs can be configured to initiate a pre-alarm or alarm condition. A 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 the genset and, when ready, applies power to the load from the
genset. 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 will transfer the load back to the mains and
stop the engine. During closed breaker transitions, the optional Auto Synchronizer can synchronize the
generator 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.
Introduction DGC-2020HD