9400200990 Rev I DGC-2020 General Information 1-3
LSM-2020 (LOAD SHARE MODULE)
The optional LSM-2020 in conjunction with the DGC-2020 provides load sharing between governors
through an analog load share line. The LSM-2020 communicates through an ethernet port and provides
access to the DGC-2020 via ethernet. Refer to Section 8, LSM-2020 (Load Share Module), for more
information.
CEM-2020 (CONTACT EXPANSION MODULE)
The optional CEM-2020 provides 10 additional contact inputs and 24 additional output contacts to the
DGC-2020. The CEM-2020 communicates with the DGC-2020 through a CANBus interface. Refer to
Section 9, CEM-2020 (Contact Expansion Module), for more information.
STYLE AND PART NUMBERS
Style Number
Standard-order DGC-2020 controllers are identified by a style number which consists of a combination of
letters and numbers that define the controller’s electrical characteristics and operational features. The
model number, together with the style number, describes the options included in a specific controller.
Figure 1-1 illustrates the DGC-2020 style number identification chart.
Figure 1-1. DGC-2020 Style Chart
For example, if a DGC-2020 style number were 51BNBMEAH, the controller would have the following
characteristics and operating features.
5 5 Aac current sensing inputs
1 50/60 hertz nominal generator frequency
B 3 fixed-function output contacts and 12 programmable output contacts
N No RS-485 communication port
B Battery backup for real-time clock during losses of control power
M Internal dial-out modem—US version
E Enhanced generator protection (undervoltage, reverse power, loss of excitation, phase imbalance,
overcurrent, overvoltage, overfrequency, and underfrequency)
A Auto-synchronizer
H LCD heater
Part Numbers
A ten-digit part number specifies the electrical characteristics and operational features of special-order
DGC-2020 controllers.
Table 1-1 lists the special-order DGC-2020
controllers available along with
descriptions of their operating features.
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