OPERATING PROCEDURES
STATION START-UP AND OPERATION
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I-E96-117B
®
The manual override switch is behind the legend door at the
top of the analog control station faceplate (see Figure
).
NOTE: Toggling the M/A switch to reset the CIS/MFP/SAC combi-
nation when there is a faulty CIS module, bad cabling or field termi-
nation causes a potential loss of control. Control is suspended for
500 milliseconds from the time the M/A switch is toggled until the
station returns to bypass.
In normal operation, with the load removed from the analog
output and then applied, the CIS/SAC/MFP combination
becomes locked into bypass mode until one of the three mod-
ules is reset. The removal of the load can be caused by a bad
CIS cable, field wiring, termination device failure or a field
device failure. On stations that have firmware revision B.3 or
higher, the operator can remove the control loop from the
locked bypass condition using the M/A switch. Do this by tog-
gling the M/A switch from
A
to
M
, and then back to
A
. Only use
this procedure if the cause of the SAC station entering bypass
is an open load and the load is reconnected before using the
M/A switch. Under these conditions, toggling the M/A switch
removes the control loop from bypass with no loss of control
(bumpless transfer).
If the cause of bypass is a faulty CIS module or related cabling
or termination, toggling the M/A switch causes loss of control
for 500 milliseconds before the SAC station returns to bypass.
During the 500 milliseconds the control output will be zero
milliamps. Refer to the corrective action for error codes E07
and E08 in Table
for more information.
STATION START-UP AND OPERATION
Station start-up is automatic when the station is inserted in
the station housing and receives power. The station does a
sequence test on the faceplate displays before it begins normal
operation. The steps of the faceplate sequence test are:
1. The bar graphs ramp from 0 to 100%.
2. Each annunciator turns on in sequence from top to bot-
tom.
3. Each LED lights in this order:
MAN.
ALARM ACK.
CMPTR.
4. The alphanumeric display runs through a walking segment
test from left to right.
This test does not halt on a display failure. The operator must
observe the faceplate during the sequence test to determine if
