Date Code 990215 Inputs, Outputs, Timers, and Other Control Logic 7-33
SEL-351P Manual Técnico
output contact coil is energized. A “b” type output contact is closed when the output contact coil
is deenergized and open when the output contact coil is energized.
Notice in
Figure SECTION 7: .26 that all four possible combinations of output contact coil
states (energized or deenergized) and output contact types (a or b) are demonstrated. See Output
Contact Jumpers in Section 2: Additional Installation Details for output contact type options.
Output contact pickup/dropout time is 4 ms.
ALARM Output Contact
Refer to
Figure SECTION 7: .26 and Relay Self-Tests in Section 13: Testing and
Troubleshooting.
When the relay is operational, the ALARM output contact coil is energized. The alarm
logic/circuitry keeps the ALARM output contact coil energized. Depending on the ALARM
output contact type (a or b), the ALARM output contact closes or opens as demonstrated in
Figure SECTION 7: .26. An “a” type output contact is open when the output contact coil is
deenergized and closed when the output contact coil is energized. A “b” type output contact is
closed when the output contact coil is deenergized and open when the output contact coil is
energized.
To verify ALARM output contact mechanical integrity, execute the serial port command PULSE
ALARM. Execution of this command momentarily deenergizes the ALARM output contact coil.
The Relay Word bit ALARM is deasserted to logical 0 when the relay is operational. When the
serial port command PULSE ALARM is executed, the ALARM Relay Word bit momentarily
asserts to logical 1. Also, when the relay enters Access Level 2, the ALARM Relay Word bit
momentarily asserts to logical 1 (and the ALARM output contact coil is deenergized
momentarily).
Notice in
Figure SECTION 7: .26 that all possible combinations of ALARM output contact coil
states (energized or deenergized) and output contact types (a or b) are demonstrated. See Output
Contact Jumpers in Section 2: Additional Installation Details for output contact type options.
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