E-Mon E-PS-E-RTU-N - Manual (Page 88)

Chapter 5 Configuring the PowerSmart+ PQM General Meter Setup
88 PowerSmart+ Power Quality Meter
If you do not want to use hysteresis for the trigger, set the Release Limit
to the same value as the Operate Limit.
Using Binary Triggers
Binary (digital) triggers like digital inputs and relays are tested for
ON/CLOSED or OFF/OPEN status.
In the PowerSmart+ PQM, the binary events are level-sensitive events.
An event is asserted all the time while the corresponding condition exists.
Delaying Setpoint Operations
Two optional delays can be added to each setpoint to extend monitoring
triggers for a longer time before reaching 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 of at least as long as the delay time.
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 meter:
• 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 that can be inspected through communications and via
the display (see
Status Display in Chapter 3). The register holds
the last setpoint alarm status until it is explicitly cleared through
communications or via the display.
• A programmable action is performed 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 that are shared for each target relay
between all setpoints using an OR scheme.
A relay output is operated when one of the setpoints linked to the relay is
activated and remains operated until all of these setpoints are released
(except for latched relays that require a separate release command to be
deactivated).
Using Time Counters
Any of the general counters can be used to count the setpoint operation
time. If you select the TIME CNT n action for a setpoint, the target
counter measures the time while the setpoint is in the operated state. The
counter resolution is 0.1 hour. See
Status Display in Chapter 3 on how to
examine the counters via the front display.