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39
OPTImizer
2
Aux A
Input
+
+
52/a
Closed Open
A Input Polarity
= Negative
Figure 15: Aux A Interface using Individually Wetted 52 / a
Contact
This is an elementary diagram of a typical trip circuit.
With the
OPTI
mizer
2
Aux A input wired in series with an
individually wetted
SPARE
52 / a contact, the voltage levels
sensed by the Aux A input during a trip operation would be
as follows:
• Breaker Closed - The trip initiates are open, and
the 52 / a is closed. The Aux A input would sense
voltage.
• Trip Command - One of the trip initiate contacts
closes. This causes high current to flow through
the trip coil, which begins to pull the latch. The Aux
A input would continue to sense a voltage, with the
52 / a contact remaining closed, as the breaker has
not yet begun to travel.
• Breaker Travel - As the breaker begins to travel, the
52 / a contact opens. The Aux A input would sense a
transition from voltage to no-voltage.
• Fully Opened - The 52 / a contact remains open,
and the Aux A input would continue to sense a no-
voltage condition.
In summation, the OPTI
mizer
2
, when applied in
series with an individually wetted 52 / a contact,
should be set as:
• A Input Polarity = “Negative”
• INPUT MODE = “1” or “3”.
B INPUT POLARITY
(Aux B Input Assertion Level)
Entering the proper Aux B input assertion level allows the
OPTI
mizer
2
to properly stop the mechanism time log. The
OPTI
mizer
2
reacts to a change in voltage state when the
breaker is proceeding from the closed position to the open
position. These are defined to the
OPTI
mizer
2
as:
•
No-voltage to voltage = “Positive”
•
Voltage to no-voltage = “Negative”
Note:
When the
OPTI
mizer
2
is cold-started, the B Input
Polarity parameter is set to “Positive”.
B Input Polarity:
The B Input Polarity is selected from a
pull-down list.
To determine the assertion level, refer to the following
diagrams.
OPTImizer
2
Aux B
Input
+
+
52/b
Closed Open
B Input Polarity
= Positive
G
Figure 16: Aux B Interface, using Green Light
This is an elementary diagram of a typical 52
/
b
contact / green light circuit. With the
OPTI
mizer
2
Aux B
input wired in parallel with the green light, the voltage levels
sensed by the Aux B input during a trip operation would be
as follows:
• Breaker Closed - The 52 / b contact is opened. The
Aux B input would sense a no-voltage condition.
• Trip Command - One of the trip initiate contacts
closes. This causes high current to flow through the
trip coil, which begins to pull the latch. The Aux B
input would sense a no-voltage condition, with the
52 / b contact remaining opened, as the breaker has
not yet begun to travel.
• Breaker Travel - As the breaker nears the end of
travel, the 52 / b contact closes. The Aux B input
would sense a transition from no-voltage to voltage.
• Fully Opened - The 52 / b contact remains closed,
and the Aux B input would continue to sense a
voltage.