Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 64)

T6200 Controller Operation
5-6
transfers the configuration to the backup board through the backup serial link. The standby primary
board’s memory cannot be cleared during runtime operation without removing the board. To transfer a
configuration from a backup board to a primary board, the primary board must be removed (unplugged)
and reinstalled, clearing the memory at the same time (see Replacing Control Boards below). The
primary board, with cleared memory, will then request a configuration transfer from the active backup
board.
Replacing Control Boards
In a system with redundant boards, the backup board can be activated to allow removal of the primary
board without upsetting the system. Depressing the PUSH TO ACTIVATE switch will activate the
backup board. The NORmal LED must be illuminated and the OUT LED must not be illuminated before
the board can be activated. When the backup board is active, it transmits a "Backup Active" alarm to the
host on the Ethernet. This alarm cannot be cleared as long as the backup board is active.
After the backup board has been activated, the primary board may be removed by pulling on the handle on
the front of the board to unplug it.
The memory must be cleared in the replacement board. To clear the memory, plug in the replacement
board and depress the PUSH TO ACTIVATE switch for one or more seconds within the first three
seconds. The OUT LED will illuminate for a few seconds while it gets the configuration from the backup
board and then compiles it. After the OUT LED goes off, depress the PUSH TO ACTIVATE switch to
activate the primary board.
If you do not clear the memory, the replacement board will retain its old configuration.
Before plugging in a replacement Controller, verify
it is the same model and the jumper placements are the same.
Refer to the jumper placement in Section Three,
Hardware Installation/Maintenance.
Each Controller model has a different mechanical key to prevent the incorrect model from being plugged
into the termination panel.
Plug in the replacement Controller. The NORmal LED will not illuminate for a few seconds while it gets
the configuration from the Backup Controller and then compiles it. After the NORmal LED illuminates,
depress the PUSH TO ACTIVATE switch to activate the Primary Controller.
When replacing a Controller that does not have a backup and the application process is shutdown, the
Controller can just be unplugged and the matching replacement board plugged in its place. If the
replacement board has an undesirable configuration, it can be cleared by depressing the PUSH TO
ACTIVATE switch for more than one second within the first three seconds after the Controller has been
plugged in. A new configuration can be down loaded from the host.
Loading Controller Configuration
If a Controller is unplugged or power is removed long enough for the capacitor (that is used to keep the
RAM alive) to discharge (usually about one week) the above process will have to be repeated.
CAUTION