Winco DGC-2020 - Manual (Page 232)

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 8-8 illustrates connections
using the additional AVR’ terminal as a landing point.
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
P0052-56
12 or
24 Vdc
To System Load
Share Line
Figure 8-8. Connections using the AVR’ Terminal
APPLICATION
Interfacing an External Control Device with a DGC-2020 – LSM-2020 System
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 controls the bias inputs to the AVR and governor. This can be
done by placing the bias output of the LSM and the bias output of the external device in series. If the
output of the LSM is connected in series with the bias output of the external synchronizer as shown in
Figure 8-9, both devices will be allowed to exercise control over the bias input of the governor.
Be sure the LSM and the external device are never in a situation where they oppose each other. Both
devices should not be trying to exercise dynamic control at the same time. For example, an external
synchronizer should only be used with a DGC-2020 that does not have the synchronizer option, or has
the synchronizer function disabled.
In addition, be sure the analog voltage range limits of the governor or AVR inputs are not exceeded.
Exceeding these limits may result in undesired system operation, or force a device into an error or fault
state.
If it is desired to have raise/lower inputs to control speed, use a motor operated potentiometer, as the
external device. Note that if speed trim is enabled in the DGC-2020 and the generator’s breaker is closed,
the DGC-2020 will drive the system to the speed trim setpoint regardless of the presence of the external
device. When the generator breaker is open, speed trim is disabled, and the external device will control
machine speed.
A similar arrangement may be used for the bias input of an AVR if an external device is required for
voltage control.
8-12 DGC-2020 LSM-2020 (Load Share Module) 9400200990 Rev K