Satec expertmeter EM720 Operation Manual page 89

Chapter 5 Configuring the EM720
Operate limit
Release limit
Action
Target
Parameter
Operate delay
Release delay
Factory Preset Setpoints
Using Logical Expressions
EM720 Power Quality and Revenue Meter
Option Format/Range
0-10,000.000 s
0-10,000.000 s
The logical controller provides very fast response to events.
The scan time for all setpoints is 1/2 cycle time (8 ms at
60Hz and 10 ms at 50 Hz).
Setpoint
instrumentation data trending. It is linked to the meter clock
and triggers Data logs #1 and #2 on a 15-minute time basis.
Setpoint #16 is factory preset to provide energy load profile
recording to Data log #12 at 15-minute intervals. It is
protected from changes except of the time trigger operate
limit that you can set to any value from 1 to 60 minutes on
your selection.
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" overrides any preceding
condition evaluated as "false". Similarly, any trigger condition
evaluated as "false" and bound by the AND operator
overrides 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 anyway
when the trigger condition is asserted, and with the AND
operator, if the setpoint should not be operated while the
critical trigger is not asserted.
The threshold (in primary units) at which the
conditional expression would be evaluated to true.
Not applicable for digital triggers.
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.
Setpoint Actions
The action performed when the setpoint
expression is evaluated to true (see Appendix B)
The optional action target
The optional action argument (reserved)
Delays
The time delay before operation when the operate
conditions are fulfilled
The time delay before release when the release
conditions are fulfilled
#1 is factory preset
General Meter Setup
Description
to provide standard
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