Chapter 5 Configuring the EM720
General Meter Setup
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EM720 Power Quality and Revenue Meter
Using Control Setpoints
The EM720 has an embedded logical controller that runs
different actions in response to user-defined internal and
external events. Unlike a PLC, the EM720 uses a simplified
programming technique based on setpoints that allows the
user to define a logical expression based on measured analog
and digital values that produces a required action.
The EM720 provides 16 control setpoints with programmable
operate and release delays. Each setpoint evaluates a logical
expression with up to four arguments using OR/AND logic.
Whenever an expression is evaluated as “true”, the setpoint
performs up to four concurrent actions that can send a
command to the output relays, increment or decrement a
counter, or trigger a recorder.
To program the setpoints, select General Setup from the
Meter Setup menu, and then click on the Control/Alarm
Setpoints tab.
The available setpoint options are described in the following
table:
Option Format/Range
Description
Setpoint Triggers
OR/AND
OR, AND
The logical operator for the trigger
Input group
The trigger parameter group (see Appendix A)
Trigger
parameter
The trigger parameter that is used as an argument
in the logical expression (see Appendix A)
Relation
<=, >=, =, ON,
OFF
The relational operator used in the conditional
expression for the trigger
