Satec Expertmeter EM720 Operation Manual page 86

Chapter 5 Configuring the EM720
Using Interval Timers
Using Time Triggers
Delaying Setpoint Operations
86
The EM720 has 4 interval timers that are commonly used
for periodic recording of interval data at the time of the
fault or in the presence of other events detected by
setpoints. They can be programmed to generate periodic
events at user-defined intervals (see
Timers).
Interval timers are not synchronized with the clock. When
you run a timer, it generates a pulsed timer event that
can trigger a setpoint if you have put the timer into a list
of the setpoint triggers. When the setpoint event is
asserted, the timer is restarted, and then generates the
next timer event when the timer interval expires.
If you wish to record interval data at predefined intervals
without linking to other events, just select a timer as a
setpoint trigger and specify in the setpoint actions list a
data log file you want to use for recording. If you want the
periodic data to be recorded in presence of a specific
event, select triggers that identify your event, and then
add the timer at the end of the trigger list using the AND
operator.
If you want the setpoint actions to be synchronized with
the clock, for example, to provide synchronous recording
interval data each 15 minutes or each hour, or to output
time pulses through relay contacts, use the time triggers
that generate static events synchronized to the device
clock.
You can exercise the default setting for Setpoint #1 in
your meter as an example of using time triggers. The
setpoint is pre-programmed for data profiling at 15-
minute intervals using Data logs #1 and #2.
Two optional delays can be added to each setpoint to
extend monitoring setpoint triggers for a longer time
before making a decision on whether the expected event
occurred or not. When a delay is specified, the logical
controller changes the setpoint status only if all conditions
are asserted for a period at least as long as the delay
time.
Although a delay can be specified with a 1-ms resolution,
the actual value is aligned at a lower 1/2-cycle time
boundary.
You cannot use delays with pulsed events since they are
cleared immediately and do not longer exist on the next
setpoint scan.
EM720 Power Quality and Revenue Meter
General Meter Setup
Using Periodic