Satec Expertmeter EM720 Operation Manual page 84

Chapter 5 Configuring the EM720
Relation
Operate limit
Release limit
Action
Target
Parameter
Operate delay
Release delay
Factory Preset Setpoints
Using Logical Expressions
84
Option Format/Range
<=, >=, =, ON,
OFF
0-10,000.000 sec
0-10,000.000 sec
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
The relational operator used in the conditional
expression for the trigger
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
EM720 Power Quality and Revenue Meter
General Meter Setup
Description
to provide standard