User guide

REV 3 DIGITMR USER’S MANUAL
20
3.4 Timing Breakers in Time-Travel Mode
The DigiTMR can initiate the breaker operation and perform a timing test on the following
operations:
• OPEN
• CLOSE
• OPEN-CLOSE
• CLOSE-OPEN
• OPEN-CLOSE-OPEN
NOTES
• The DigiTMR can start the OPEN-CLOSE operations without a delay or by using a
programmable delay between the OPEN and CLOSE commands.
• The CLOSE-OPEN operation can be started by the DigiTMR using several
options:
o Contact #1 Close
The DigiTMR can initiate a CLOSE command and then an OPEN command
after detecting that the breaker’s contact was closed. The DigiTMR can
detect when the breaker’s contact is closed via contact channel #1. The
selection of this option is recommended for the CLOSE-OPEN operation
since it truly represents that the circuit breaker closed and then opened.
o Set DELAY
The DigiTMR can initiate a CLOSE command and then an OPEN command
after a programmable delay (in milliseconds).
o No DELAY
The DigiTMR can initiate a CLOSE command and then an OPEN command
without a delay. Since the circuit breaker is in the open state, the circuit
breaker’s 52B contact allows the close coil to be energized, which can start
the close command. When the circuit breaker is making the transition from
an open state to a close state, the 52A contact will close, allowing the
breaker to initiate the open command.
• The OPEN-CLOSE-OPEN operations can be initiated by the DigiTMR using a
programmable delay between each of the operations. The delays can be set
between the OPEN to CLOSE and between the CLOSE to OPEN operations.