Theory Of Setpoint Operation - Allen-Bradley Powermonitor 3000 User Manual

Theory of Setpoint
Operation
Allen-Bradley HMIs
1
Setpoint Programming and Operation
Setpoint operation provides a method other than communications for
the Powermonitor 3000 to be used in and interact with power and
energy applications. Some examples of setpoint applications include:
• Turning on an output relay when predicted demand exceeds a
preset level, for simple demand management
• Turning off an output relay if phase rotation is accidentally
reversed, helping to assure that loads rotate in the correct
direction
• Capturing an oscillogram when a status input is energized
Setpoint operation permits the Powermonitor 3000 to simultaneously
monitor a number of parameters and take action when specified
conditions are met. The M4 and M5 models support 10 setpoints while
the M6 and M8 support 20.
There are eight parameters to configure for each setpoint: Setpoint
Number, Type, Evaluation Condition, High Limit, Low Limit, Action
Delay, Release Delay, and Action Type. These parameters are described
in Table 5.1.
In the M6 and M8 models, setpoints 19 and 20 have special
significance and are preset at the factory. Refer to Sag and Swell in the
Advanced Features chapter of this manual.
When a setpoint activates, it takes the action defined in Setpoint
Action Type and writes a time-stamped entry to the Event Log.
Setpoint action types that energize a relay or KYZ output or set an
alarm flag are maintained until the setpoint releases. Other setpoint
actions such as capturing an oscillograph or clearing a counter occur
when the setpoint activates. The Powermonitor 3000 also writes a
time-stamped entry in the Event Log when the setpoint releases.
The event log record contains the maximum over-voltage or
under-voltage recorded during a swell or sag condition, respectively.
This applies only to models M6 and M8 beginning with master module
firmware revision 2.5x. Prior to version 2.5x, the event log record
includes the high and low limits of the setpoint.
Chapter
Publication 1404-UM001D-EN-E - October 2004
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