Basler Electric DGC-2020 - Manual (Page 26)

Functions
DGC-2020 Digital Genset Controllers perform the following functions:
Generator Protection and Metering
Multifunction generator protection guards against generator overvoltage, undervoltage, reverse power,
loss of excitation, underfrequency, and overfrequency. Overcurrent, phase imbalance, and loss of mains
protection are available as an option. Each generator protection function has an adjustable pickup and
time delay setting. Sixteen inverse time curves enable the DGC-2020 to offer overcurrent protection in a
variety of applications.
Metered generator parameters include voltage, current, real power (watts), apparent power (VA), and
power factor (PF).
Engine Protection and Metering
Engine protection features include oil pressure and coolant temperature monitoring, overcrank protection,
ECU specific protection elements, and diagnostic reporting.
Metered engine parameters include oil pressure, coolant temperature, battery voltage, speed, fuel level,
engine load, coolant level (from ECU), ECU specific parameters, and run-time statistics.
Event Recording
An event log retains a history of system events in nonvolatile memory. Up to 30 event types are retained
and each record contains a time stamp of the first and last occurrence, and the number of occurrences for
each event. For more information, see Section 3, Functional Description, Event Recording.
Auto-Synchronizer
An optional automatic synchronizer monitors the bus and generator voltages and supplies discrete
raise/lower correction signals to synchronize the generator voltage, frequency, and slip angle with that of
the bus.
Contact Inputs and Output Contacts
DGC-2020 controllers have one, dedicated emergency stop contact input and 16 programmable contact
inputs. All contact inputs recognize dry contacts. The programmable inputs can be configured to initiate a
pre-alarm or alarm. A programmable input can be programmed to receive an input from an automatic
transfer switch or override DGC-2020 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 four user-programmable output contacts are provided if the style number is
xxAxxxxxx. If the style number is xxBxxxxxx, an additional twelve 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-2020 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 dead bus threshold
•
Any phase of bus voltage unstable due to overvoltage or undervoltage
•
Any phase of bus voltage unstable due to overfrequency or underfrequency
At this time, the DGC-2020 will start the genset and when ready, apply power to the load via the genset.
The DGC-2020 implements open or closed transitions to and from the mains. When the mains returns
and is considered stable, the DGC-2020 will transfer the load back to the mains. When closed transitions
are required, the Auto Synchronizer option of the DGC-2020 is required in order to synchronize the
generator to the mains when transferring a load from generator power to utility power.
Communication
Standard DGC-2020 communication features include a standard USB port and SAE J1939 interface.
Optional communication features include an RS-232 port for connection with an external dial-out modem
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