
44
MODE 4
Figure 53
– Selecting Input Mode 4
This choice monitors the state of a single Opening Coil and the 52b auxiliary switch. When the Opening Coil is energized, the
Optimizer3 registers an Open operation and records the time duration of the Opening Coil pulse. The start is the protective relay
closing the trip circuit. The end is the opening of the 52A auxiliary switch, modified by the A Input Delay, which begins the
Contact Duty measurement . This time duration is named Opening Time, given in milliseconds. The Opening Time measurement is
modified by the A Input Delay.
The Opening Travel Time is defined by the time duration beginning with the falling edge of the Opening Coil pulse (52a auxiliary
switch opening) and ending with 52b auxiliary switch closing. This segment of time is recorded and reported as Opening Travel
Time, given in milliseconds. Opening Travel Time is the actual measurement and is not modified by the A Input Delay.
Circuit breaker Close operations are detected from the 52b auxiliary switch transitioning from closed to open. In Mode 4, no timing
information is recorded for the Close operation other than a date and time stamp.
The Optimizer3 pre-assigns the control inputs as a default, but they can be changed if desired. The AUX 1 input can be assigned to
the Opening Coil and the AUX 2 input can be assigned to 52b auxiliary switch.
The recommended AUX 2 connection is to a spare 52b switch that is wetted by the station battery voltage. There are other wiring
connections which give an equivalent timing signal for AUX 2 - in parallel to an in service 52b auxiliary switch or connection in
parallel with the green light bulb. The Green Light/52b Polarity setting is specific to the connection location.
NOTE
: Recommended connection diagrams are shown in the following diagram (Figure 54).