E-Mon E-PS-A-RTU-N - Manual (Page 73)

Chapter 4 Power
S O F T W A R E G E N E R A L M E T E R S E T U P
PowerSmart+ Advanced Power Quality Meter 73
The available setpoint options are described in the following table.
Option Range Description
Triggers
OR/AND OR, AND The logical operator for the trigger
Trigger
parameter See Appendix C The trigger parameter that is used as an argument in
the logical expression
Operate limit The threshold (in primary units) at which the
conditional expression would be evaluated to true.
Not applicable for digital triggers.
Release limit The threshold (in primary units) at which the
conditional expression would be evaluated to false.
Defines the hysteresis for analog triggers. Not
applicable for digital triggers.
Actions
Action See Appendix C The action performed when the setpoint expression is
evaluated to true (the setpoint is in operated state)
Delays
Operate delay 0.1-999.9 sec The time delay before operation when the operate
conditions are fulfilled
Release delay 0.1-999.9 sec The time delay before release when the release
conditions are fulfilled
Setpoint #1 is factory preset to provide standard periodic data logs on a 15-minute time
basis. It is linked to the device clock and runs data logs #1 and #2 at 15-minute boundaries
of an hour.
Using Logical Expressions
Logical operators OR/AND are treated in a simplified manner. They have no specific
priority or precedence rules.
Any trigger condition bound to the logical expression by the OR operator and
evaluated as “true” will override any preceding condition evaluated as “false”.
Similarly, any trigger condition evaluated as “false” and bound by the AND operator
will override any condition evaluated before it as “true”.
To avoid confusion, it is recommended not to alternate different logical operators in
one expression. Instead, bring all conditions that use the same logical operator
together at one side of the expression, and the others - at the opposite side.
To explicitly override all other conditions with the critical trigger, put it at the end of
the expression using the OR operator if you want the setpoint to be operated