Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 122/190 © Woodward
monitored though other means than the state of the relay.
Closed circuit current (NC):
The relay is disabled (i.e. in idle state) when current flows through the coil.
If a loss of the supply voltage occurs, a change of state will occur in the relay and a triggering of
fault conditions will occur.
Relay programmed as 'operating current relay'
Operating current
contact
Idle-current
contact
current flow
0 V
RELEASE
Relay operates
24 V
RELEASE
Operating current
contact
Idle-current
contact
RELEASE
Relay releases
no current flow
0 V
Relay programmed as 'idle-current relay'
RELEASE
24 V
Figure 9-3: NO/NC logic
Example: Discrete inputs 1 through 4 (same procedure for inputs 5 to 14)
Parameter 191
Dig.input 1234
function DDDD
Function of the discrete alarm inputs 1 to 4 E/D
The discrete inputs may be operated by an operating current contact or a closed cir-
cuit current contact. The closed circuit current input may be used to monitor for a
wire break. A positive or negative voltage difference may be utilized.
D...................The discrete input is analyzed as "enabled" by applying of a voltage
difference (NO/operating current).
E ...................The discrete input is analyzed as "disabled" by removal of a voltage
difference (NC/idle current).
Parameter 192
Dig.input 1234
delay 0000
Delay time of the discrete alarm inputs 1 to 4 0 to 9
A delay time in stages can be assigned to each alarm input. The individual stages
are listed below. The discrete input must be present without interruption throughout
the delay time in order to be "enabled".
Delay stage Delay stage
0 100 ms
1 200 ms
2 500 ms
3 1 s
4 2 s
5 5 s
6 10 s
7 20 s
8 50 s
9 100 s
Table 9-4: Discrete alarm inputs - delay stages
Parameter 193
Delayed by 1234
eng.speed YYYY
Delayed by firing speed of the discrete alarm inputs 1 to 4 Y/N
If the discrete input used as an alarm input is only to be monitored when the engine
is running ("firing speed reached") is specified here.
Y...................After engine monitoring has been enabled the discrete input is moni-
tored.
N...................The discrete input is always monitored.

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English