
Manual 37135C
IKD 1 - Digital I/O Expansion Board
© Woodward
Page 27/41
Relay Outputs
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NOTE
•
Operating current (NO): After the tripping, the relay picks up, i.e. current is flowing through the coil
while in operate condition. In the event of a loss of the power supply, the status of the relay is not
changed and no tripping occurs. In this case, the readiness for operation of the relay should be
monitored.
•
Closed circuit current (NC): After the tripping, the relay drops off, i.e. current is flowing through the
coil while in release condition. The relay is picked up while in release condition (= no tripping). In
the event of a loss of the power supply, the status of the relay is changed and a tripping occurs.
Operating current
contact
Idle-current
contact
cu
rrent
fl
ow
0 V
RELEASE
Relay operates
24 V
RELEASE
Operating current
contact
Idle-current
contact
RELEASE
Relay releases
no
c
ur
rent
fl
ow
0 V
RELEASE
24 V
Figure 6-1: NO/NC
Relay 1 read. for
operation
Relay 1 is "Readiness for operation"
YES/NO
Relay 1 can be configured as a "Readiness for operation" relay.
YES
.............. The relay is pulled as long as the IKD 1 works perfectly. If the system
fails this relay would drop (the following parameters for this relay are
invalid).
NO
................ The relay works according to the following parameters.
Relay x Function NC
[x = 1 to 8]
Type
YES/NO
A distinction between different control principles is made with the selection between
operating (NO) and closed circuit current (NC) contact. An NO output can be used if
a wire break can lead to no great alarm; the NC output performs advanced tasks e. g.
for safety-relevant lines.
YES
.............. NO - operating current.
NO
................ NC - closed circuit current.
Relay x CAN alarm
Select CAN fault relay
YES/NO
All available relays can be select to output a CAN fault (see above).
YES
.............. If a CAN fault applies for at least the configured delay time the relays
is enabled. If no CAN fault is present this relay only can be set if an
OR connection was configured with the value to be output (see be-
low).
NO
................ During a CAN fault the relay either changes into base status or re-
mains in set status (according to configuration).
Note:
Above configured type is taken into account!