Rockwell Automation 1403-DM_LM_MM Powermonitor II Instruction Sheet - Manual (Page 52)

4-16 General Operation
1403-IN001A-US-P
Setpoints
Theory of Setpoint Operation
The Powermonitor II is capable of monitoring many
parameters (simultaneously), generating alarms,
controlling relays, and triggering other internal
actions. Setpoints are used to perform this function.
The Powermonitor II supports 20 simultaneous
setpoints. A setpoint consists of eight parameters:
setpoint number, type, evaluation condition, high
limit, low limit, action delay, release delay, and
action type. These parameters are described in Table
4.8.
Setpoints evaluate data based on six different
conditions: over forward, over reverse, under
forward, under reverse, equal, and not equal.
Over Forward Setpoint
An over forward setpoint becomes active when the
magnitude of the parameter being monitored goes
over the “Setpoint High Limit” in the positive
direction (and stays over the limit) for a period of
time greater than the “Setpoint Action Delay”
parameter. When a setpoint becomes active, it causes
an action identified by “Setpoint Action Type” to
occur and log this occurrence in the Event log as a
time-stamped event. If this action is to energize a
relay, or set an alarm bit, that action remains true
until the setpoint becomes inactive. An over forward
setpoint becomes inactive when the magnitude of the
parameter being monitored falls below the “Setpoint
Low Limit” (and stays below the limit) for a period
of time greater than the “Setpoint Release Delay.”
The change from active to inactive is also logged in
the Event log as a time-stamped event.
Figure 4.4 Over Forward
Parameter Value
Setpoint
High Limit
Setpoint
Low Limit
≥
Setpoint Action Delay
<Setpoint
Release Delay
≥
Setpoint
Release Delay
Time (s)
Setpoint Activated