System Overview
The Unipower HPL110A advanced digital
power monitor is a member of the
Unipower family of “Intelligent Power-
Control Units” designed for protection and
control of motor driven mechanical systems.
The HPL110A measures true power
consumption of 3-phase AC motors
(single phase versions also available) and
displays consumption as a percentage of
selected power range. Power consumption
(kW) is calculated from the formula:
P =
Ö
3 x U x I x cos
j
The display shows power in units of %kW which represent the percentage
of full load power range for the unit.
Control functions comprise two independent and programmable trip functions:
Low Power Alarm -
for example, to stop a pump in the event of dry-running, and
High Power Alarm -
for example, to stop a feeder when blocked.
The alarm functions activate a single alarm relay which may be used to control the motor
being monitored; i.e. to trip a shut-down in the event of either a high or low power alarm.
The HPL110A may be configured to monitor any size motor either with the internal current
transformer for applications up to 8A or with an external CT for applications above 8A.
The HPL110A provides consistent sensitivity across the complete motor load range
making it ideal for low trip applications where amp meters are ineffective. In addition,
the HPL110A measurement principle allows it to be used on non-sine shaped loads such
as Variable Frequency Drives.
The digital design of the HPL110A including 3-key programming, 3 digit display, Max/Min
Peak Hold, Program Lock and Power Down Alarm Block functions make it very easy to use.
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