Basler Electric DGC-2020 - Manual (Page 382)

Connections using AVR’, GOV’, and LS’
Additional terminals provide a landing point to add series resistance to the GOV, AVR, and LS analog
outputs. These terminals are not internally connected to the LSM-2020. Figure 9-10 illustrates
connections using the additional AVR’ terminal as a landing point.
Figure 9-10. Connections using the AVR’, GOV’, and LS’ Terminals
Application
Interfacing an External Control Device with a DGC-2020 – LSM-2020 System
Method 1
In some cases, it may be necessary to interface an external device, such as a synchronizer, to a DGC-
2020 - LSM-2020 system where the LSM-2020 controls the analog bias inputs to the AVR and governor.
If an external synchronizer is used in conjunction with the LSM-2020 to drive the governor analog speed
bias signal, contacts that indicate generator breaker status can be used to switch the analog speed bias
signal between the two devices as shown in Figure 9-11.
NOTE
Any relay contacts which are used to switch load share lines, governor analog
speed bias signals, or voltage regulator analog voltage bias signals must use a
relay intended for low voltage, low current applications to preserve signal
integrity. Signal relays, not power relays, must be used for this application. It is
recommended that relays having gold contacts are used.
The “A” contact is a normally open contact which is open when the generator breaker is open, and is
closed when the generator breaker is closed. The “B” contact is a normally-closed contact that is closed
when the generator breaker is open, and is open when the generator breaker is closed. The contact
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Ethernet
LSM-2020
AVR+
AVR-
AVR’
GOV+
GOV-
GOV’
CANL
CANH
GND
V+
IN-
I+
LS+
LS-
LS’
B-
B+
GND
Voltage
Regulator
Analog
Aux
Input
Governor
Analog
Aux
Input
DGC-2020
CANL
CANH
SHIELD
P0071-82
12 or
24 Vdc
To System Load
Share Line
9-12 DGC-2020 LSM-2020 (Load Share Module) 9400200990 Rev X