Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-35
SEL-351 Instruction Manual
The assertion of Relay Word bit OUTm (m = 1 through 11) to logical 1 causes the energization of
the corresponding output contact OUTm coil. Depending on the contact type (a or b), the output
contact closes or opens as demonstrated in Figure 7.28. 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.
Notice in Figure 7.28 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: Installation for output contact type options.
Output contact pickup/dropout time is 4 ms.
ALARM Output Contact
Refer to Figure 7.28, Figure 7.29, 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 7.28
and Figure 7.29. 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 7.28 and Figure 7.29 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: Installation for output contact type options.
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
