9400200990 Rev I DGC-2020 BESTCOMSPlus Software 4-17
Figure 4-15. RS-485 Setup
A
Baud Rate: A value of 1200, 2400, 4800, or 9600 may be selected.
B
Parity: No Parity, Odd Parity, or Even Parity.
C
Modbus Address: A value of 1 to 247 may be entered in increments of 1.
SYSTEM PARAMETERS
System parameters configure the DGC-2020 for operation with a specific application and are divided into
three categories: system, engine cranking, and sensing transformers.
System Settings
The following settings are used to configure the DGC-2020 for operation with a specific genset
application.
Genset Electrical Parameters
Genset electrical parameters used by the DGC-2020 include the genset connection type, power rating,
and voltage rating.
Genset connection types
A
accommodated by the DGC-2020 include three, three-phase configurations
(delta, wye, and four-wire delta) and two single-phase configurations (sensing across phases A and B or
A and C).
The DGC-2020 is compatible with gensets having power ratings
B
up to 9,999 kW and voltage ratings
C
up
to 9,999 Vac.
The 32 and 40Q protection functions use the Rated Power Factor setting
D
when determining pickup.
Engine Speed Measurement
The DGC-2020 can be configured to detect engine speed
E
from a magnetic pickup (MPU), the genset
frequency, or both the MPU and genset frequency.
When engine speed is obtained from the genset frequency, the DGC-2020 uses the rated (nominal)
genset frequency
F
and nominal rpm rating
G
when calculating engine rpm.
When engine speed is obtained from an MPU, the DGC-2020 uses the nominal rpm rating
F
and the
number of flywheel teeth
H
when calculating engine rpm.
The speed signal from the MPU takes priority when both the genset frequency and MPU are selected as
the engine speed source. If both MPU and genset frequency are selected and the MPU fails, the DGC-
2020 will automatically switch to the genset frequency as the engine speed source.
When the CAN interface is used, the speed signal source settings must be set at MPU or MPU_Gen. This
allows the DGC-2020 to receive the engine speed data sent by the ECU via the SAE J1939 protocol.
Engine Cooldown
After a genset’s load is removed, the DGC-2020 can ensure proper engine and turbocharger cooldown by
maintaining engine operation for a user-specified duration. The cooldown time delay
I
is initiated for any
one of the following conditions:
• Genset load is removed and engine shutdown is permitted
• Auto transfer switch (ATS) opens while operating in Auto mode
• Remote shutdown is initiated
EPS Threshold
Indication that the emergency power system is supplying load is determined by a user-adjustable
threshold setting
J
expressed as a percentage of the genset CT (nominal) primary rating.
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