7.33
Date Code 20060320 Instruction Manual SEL-311C Relay
Inputs, Outputs, Timers, and Other Control Logic
Output Contacts
Notice in Figure 7.27 that all four possible combinations of output contact coil
states (energized or de-energized) and output contact types (a or b) are
demonstrated. See Output Contact Jumpers on page 2.23 for output contact
type options.
Output contact pickup/dropout time is typically 4 ms.
ALARM Output Contact
Refer to Figure 7.27 and Relay Self-Tests on page 13.58.
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 7.27. An a type output contact is
open when the output contact coil is de-energized and closed when the output
contact coil is energized. A b type output contact is closed when the output
contact coil is de-energized 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
de-energizes 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 de-energized momentarily).
Notice in Figure 7.27 that all possible combinations of ALARM output contact
coil states (energized or de-energized) and output contact types (a or b) are
demonstrated. See Output Contact Jumpers on page 2.23 for output contact
type options.
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