E-Mon E-PS-A-RTU-N - Manual (Page 75)

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 75
You can exercise the default setting for Setpoint #1 in your device 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.
Delaying Setpoint Operations
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 will change the
setpoint status only if all conditions are asserted for a period at least as long as the
delay time.
Note that you cannot use delays with pulsed events since they are cleared
immediately and will no longer exist on the next setpoint scan.
Using Setpoint Events and Actions
When a setpoint status changes, i.e., a setpoint event is either asserted or de-
asserted, the following happens in your device:
The new setpoint status is logged to the setpoint status register that can be monitored
through communications from the SCADA system or from a programmable controller in
order to give an indication on the expected event.
The operated setpoint status is latched to the setpoint alarm latch register accessible
through communications. The register holds the last setpoint alarm status until it is
explicitly cleared through communications.
Up to four programmable actions can be performed in sequence on setpoint status
transition when a setpoint event is asserted.
Generally, setpoint actions are performed independently for each setpoint and can
be repeated a number of times for the same target. The exceptions are relay
operations, data logging and waveform logging that are shared for each separate
target between all setpoints using an OR scheme.
A relay output is operated when one of the setpoints linked to the relay is activated
and will stay in the operated state until all of these setpoints are released (except for
latched relays that require a separate release command to be deactivated).
Data logging and waveform logging directed to the same file are done once for the
first setpoint among those that specify the same action, guaranteeing that there will
not be repeated records related to the same time.
Recording Setpoint Events
Time-tagged setpoint events can be recorded to the device Event log if you put a
corresponding action into the setpoint action list. The Event recorder will log any
setpoint transition event: both when the setpoint is operated, and when it is
released. The Event recorder will put into a log file a separate record for each active
trigger caused a setpoint status transition, and a separate record for each action
done on the setpoint activation (except for data logging actions that are not
recorded to the Event log).