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24 C578M-A (4/05)
The following table illustrates how to implement these actions for the HS. Included are pertinent “before and after” visual changes associated
with the action along with applicable notes about system operation. The shorthand, visual icons used in the LED “legend” and Table A of the
preceding section are also applicable here.
Table B. Front Panel Button Operation
START END
FUNCTION LED STATUS FP BUTTON ACTION REMARKS LED STATUS COMMENTS
FAULT
Acknowledging
A-Side
Control
FAULT
Acknowledging
B-Side
control
Change
Control
Change
Mode
(synchronous to
asynchronous or
visa versa)
Change
Diagnostic
View
A to B
or
B to A
N/A
CC1 CC1
AB
KVD KVD
AB
20079
Any successful HS
auto-response to an
alarm results in a
changeover** to
asynchronous mode.
Press and hold CC1
A button for two
audible beeps.
Any successful HS
auto-response to an
alarm results in a
changeover** to
asynchronous mode.
Press and hold CC1
B button for two
audible beeps.
To change control
from A- to B-side,
press CC1 B once;
or conversely, press
CC1 A once.
Press and hold
(for two beeps),
either the CC1 A or
CC1 B button.
CC1 CC1
AB
KVD KVD
AB
20081
A-Side
Asynchronous mode
is reasserted and the
alarm has been
acknowledged.
B-Side
Asynchronous mode
is reasserted and the
alarm has been
acknowledged.
LED attributes
change accordingly.
You can start from
either A- or B-side,
synchronous mode
and change to either
A- or B-side
asynchronous mode.
or
CC1 CC1
AB
KVD KVD
AB
20081
CC1 CC1
AB
KVD KVD
AB
20079
or
or
or
CC1 CC1
AB
KVD KVD
AB
20081
CC1 CC1
AB
KVD KVD
AB
20079
or
either/
or
CC1 CC1
AB
KVD KVD
AB
20080
CC1 CC1
AB
KVD KVD
AB
20082
or
By default, the diagnostic view follows the side in control
(Master) because DIP switch 1-2 is ON. You may, however,
view the diagnostic of either side (A or B) any time you want by
performing the indicated action. If the DIP switch is set to
default (follow Master) and you have switched to view the
diagnostic screen of the Slave unit, that view will remain on the
monitor until either (1) you manually reassert Master side
control, (2) press the Master-side KVD button or (3) a Slave-
side failure occurs and the HS reverts to asynchronous mode,
Master.
**All HS initiated system FAULT responses are associated with a changeover, but all changeovers are not necessarily associated
with a system FAULT. An operator-initiated changeover is a case in point.