Model 5600ACO2 Automatic Changeover Unit
3.3.2. GPI Changeover Rate
DIP switch 2 controls the speed of the decision process before a changeover is made.
DIP 2 Changeover Rate
Off (Up) Changeover in 250mS
On (Down) Changeover in 100mS
Table 3-5: Changeover Rate Switch Settings
When DIP switch 2 is in the Off position, the ACO takes approximately 250 msec. to decide whether it
needs to change, thus making it very immune to false changeovers in this mode. When DIP switch 2 is
in the ON position, the ACO will decide to change in approximately 100 msec, providing less protection
from false changeovers but quicker response to input faults.
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The 5600ACO2 firmware must be version 1.0 build 13 or higher to operate in
100mS mode.
3.3.3. Bank A Priority.
The bank priority is controlled by DIP switch 3.
DIP 3 Bank A Priority
Off (Up) Bank A and B have equal priority
On (Down) Bank A has higher priority
Table 3-6: Bank A Priority Switch Settings
When DIP switch 3 is in the Off position, the ACO gives equal priority to each bank. If the number of
valid inputs from each bank is equal, the ACO will not switch.
When DIP switch 3 is in the On position, priority will be given to Bank A. If the number of valid inputs
from each bank is equal, bank A will be selected.
3.3.4. DARS Valid Condition
The DARS valid condition is controlled by DIP switch 4.
DIP 4 DARS Valid Condition
Off (Up) DARS balanced or unbalanced
On (Down) DARS balanced and unbalanced
Table 3-7: DARS Valid Condition Switch Settings
When DIP switch 4 is in the Off position, the DARS signal will be considered valid when there is a valid
signal into either the DARS balanced input or the DARS unbalanced input or both.
When DIP switch 4 is in the On position, the DARS signal will be considered valid when there is a valid
signal into both the DARS balanced input and the DARS unbalanced input.
The signal presence will still be shown on the front panel LEDs regardless of this switch position.
OPERATION
Revision 1.3 Page 3-5
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