Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 61)

T6200 Controller Operation
5-3
T6200 Controller Operation
The redundant T6200 Controller consists of two identical control boards, primary and backup, and one
termination panel. Refer to Figure 5-1. The primary control board is always on the left and the backup
is always on the right. Normally, the primary board is the active board and the backup board is the
standby board. These roles may be reversed. When the backup board is active, it transmits a “Backup
Active” alarm to the host.
The active board controls both the analog and discrete outputs to the field. The analog and discrete
outputs are disabled on the standby board. Refer to Figure 5-2. When the outputs are required to
feedback as inputs, the outputs of the active board are used in both boards. A primary board without a
backup is always active. The active and standby boards have the same inputs and configuration.
Push to Activate Switch
A PUSH TO ACTIVATE switch (SW1) is located at the front of each control board at the bottom.
Refer to Figure 5-3. The switch has three functions:
ƒ Used to activate a standby Controller. The NORMAL LED must be illuminated before
this Controller can be activated. If the Controller is activated, the redundant Controller will be
deactivated automatically.
ƒ This switch can also be used to clear all the configuration in the Controller memory.
This can be accomplished only during the first three seconds when the Controller is being
powered up by depressing the switch for one second or more.
ƒ
Each time this switch is depressed, the Controller identification number will be
transmitted to the host over the Ethernet communications. This may be used when adding a
Controller to the network.