Schweitzer Engineering Laboratories SEL-734 - Figure 8.15 Logic Flow for Example Output Contact Operation

8.16
SEL-734 Meter Instruction Manual Date Code 20090730
Logic
Output Contacts
Factory
Settings Example
In the factory SELOGIC control equation settings, three output contacts are
used:
OUT101 = 0 (output contact OUT101 not used—set equal to zero)
OUT102 = 0 (output contact OUT102 not used—set equal to zero)
OUT103 = NOT (SALARM OR HALARM) (SALARM, HALARM;
software/hardware alarms)
Operation of Output Contacts for Different Output Contact Types
Output Contacts OUT101 Through OUT103
The execution of the serial port command PULSE n (n = OUT101–OUT103)
asserts the corresponding Meter Word bit OUTm (m = 101–103) to logical 1.
The assertion of SEL
OGIC control equation setting OUTm to logical 1 also
asserts the corresponding Meter Word bit OUTm to logical 1.
The assertion of Meter Word bit OUTm 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. An a contact output is open when the
output contact coil is de-energized and closed when the output contact coil is
energized. A b contact output is closed when the output contact coil is
de-energized and open when the output contact coil is energized.
Output contact pickup/dropout time is 8 ms for electromechanical and less
than 500 µs for solid-state contacts.
Configuring a Contact Output as an Alarm Output Contact
Refer to Figure 8.15 and Meter Self-Tests on page 12.12.
The SALARM and/or HALARM bit may be used to develop an alarm output
contact. The alarm logic SALARM and/or HALARM keeps the alarm output
contact coil energized. Depending on the output contact type (a or b), the
SALARM and/or HALARM closes or opens the contact.
The Meter Word bit SALARM and/or HALARM is deasserted to logical 0
when the meter is operational. Also, when the meter enters Access Level 2,
the SALARM Meter Word bit momentarily asserts to logical 1.
The HALARM Meter Word bit asserts momentarily for hardware warnings
and asserts permanently for hardware failures.
Figure 8.15 Logic Flow for Example Output Contact Operation
Serial Port
Commands
Meter
Word Bits
SEL OGIC
Control
Equations
Settings
Example
Meter
Word Bit
States
Output
Contact
Coil States
Output
Contacts
PULSE OUT401
PULSE OUT402
OUT401
de-energized
energized
OUT401 (a)
OUT402
OUT402 (a)
Output
Contact
Terminal
States
logical 0
logical 1
open
closed
OUT401
OUT402
Courtesy of NationalSwitchgear.com