GE DigitalFlow DF968, Service Manual

Page: 18 / 78

March 2008
1-10 Calibration
Alarms Option Card
Alarm relays may be added to the Model DF868 by installing an
Alarms Option Card in one (or more) of the six expansion slots. Each
option card includes three alarm relays, which are designated as A, B,
and C. To test the alarm relays, connect an ohmmeter to the option
card terminal block as shown in Figure 1-4 below. Refer to the menu
map in Figure 1-6 on page 1-15 as a guide.
Figure 1-4: Typical Ohmmeter Connections
For this discussion, assume that the option card has been installed in
Slot x
.
Accessing the Calibration
Menu
1. Press the
[CAL]
key to enter the Calibration Program .
2. Press
[Fx]
to select
Slot x
. (The option bar will include a slot listing
for each installed option card.)
3. Press
[F1]-[F3]
to select alarm relay A, B or C, respectively.
Terminal Block (Option Card)
A
NC
B
NO
A
NO
A
COM
9
1
+
–
Ohmmeter
C
NO
C
NC
B
COM
B
NC
C
COM