Manual 26174 EGCP-2 Engine Generator Control Package
Woodward 53
The information on the RS-485 network is for communications between controls
only and must not be interfaced in any way with external devices. There is an
RS-422 port on the EGCP-2, which is used to monitor and control the units
remotely.
Example:
2 EGCP-2s—Both EGCP-2s must have the 485 network terminated.
3 or more EGCP-2s—
1. The end controls must have the 485 network terminated (see Figure 3-27).
2. Terminals 79 and 80 should be connected from control to control
a. This eliminates signal loss if one of the terminated controls is powered
down.
EGCP-2
Unit #1
76
Twisted shielded pair. Belden 3074F or equivalent
77
78
EGCP-2
Unit #2
76
485
(-)
77
78
485
(+)
EGCP-2
Unit #8
76
485
(-)
77
78
485
(+)
485
(+)
485
(-)
VIS-109a
06-4-17
80
79
80
79
80
79
Figure 3-27. RS-485 Inter-Control Communications
Switch configuration for 2 units utilizing RS-485 communication.
Unit #1 Unit #2
SW4-1 Closed SW4-1Closed
SW4-2 Closed SW4-2 Closed
SW4-3 Closed SW4-3 Closed
Switch configuration for 3 or more units utilizing RS-485 communication.
Unit #1 Unit #2 Unit #8
SW4-1 Closed SW4-1Open SW4-1 Closed
SW4-2 Closed SW4-2 Open SW4-2 Closed
SW4-3 Closed SW4-3 Open SW4-3 Closed
When unit 2 and/or unit 3 are more than 30 m from unit 1, the cable
shield must be ac coupled to terminal 78. The capacitor must be 0.01
µF with a working voltage of 1000 Vdc or greater.
Alarms and Shutdowns
The EGCP-2 has many alarm/shutdown set points, which can be configured for
five different alarm/shutdown conditions. The five conditions are as follows:
Disabled
When an alarm set point is set for Disabled, the alarm condition will have no
external indicators to signal the event has occurred. No control actions occur as
a result of a disabled condition.
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