Chapter 5 Configuring the PM130 PLUS General Meter Setup
PM130 PLUS Powermeter Series_Installation Operation and Manual 101
Using Numeric Triggers
For numeric (analog) triggers, you can specify two thresholds for each trigger to provide hysteresis (dead
band) for setpoint operations.
The Operate Limit defines the operating threshold, and the second Release Limit defines the release
threshold for the trigger. The trigger thresholds are specified in primary units.
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 PM130, 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.
To Next Page
Loading...
