PPA55xx Quick User Guide
Page 10
3.1 PPA55xx Display Key Functions
Acquisition Control: Used for configuring inputs
appropriate to source and nature of signals being
analyzed
In single phase 1 configuration, (phase 2 & phase 3)
inputs are disabled and the selected phase acts as a
completely independent single phase power analyzer
In the 2 phase 2 wattmeter configuration, the
voltages are measured relative to each individual
phase input, with a single frequency reference
selected within the frequency reference parameter
In the 3 phase 2 wattmeter configurations, the
voltages are measured relative to phase 3. Typically
the phase 1 voltage input is connected across phase 1
and phase 3, and phase 2 voltage input is connected
across phase 2 and phase 3, thus measuring phase to
phase voltage directly. Phase 1 and 2 current inputs
are connected normally. There is no need to measure
the current in phase 3 as phase 3 has no voltage
relative to itself so the power contribution is zero. In
this mode, the neutral channel displays the
synthesized phase 3 current. The advantage of this
connection method is that 3 phase power can be
measured with only 2 wattmeters
With the 3 phase 3 wattmeter configuration, each
measurement phase is connected to a phase of the
load with the voltage low inputs measuring to neutral.
In this mode, phase to neutral voltages are measured
directly and phase to phase voltages are also
computed
In single phase 2 mode, (phase 1 & phase 3) inputs
are disabled and the selected phase acts as a
completely independent single phase power analyzer
In single phase 3 mode, (phase 1 & phase 2) inputs
are disabled and the selected phase acts as a
completely independent single phase power analyzer
3 Phase 2 Wattmeter +
PH3
As above(3 phase, 2 wattmeter) but with the option
to use PH3 as an independent meter ie, use PH3 to
measure a DC bus plus phase’s 2 & 3 to measure a 3
phase inverter output. PH3 can be set as an
additional connection for Torque & Speed to
supplement the existing "EXT" BNC connections on
the rear panel. This mode essentially facilitates
independent frequency synchronisation of PH3
In independent wiring mode each phase can be
selected as an individual analyzer enabling the ability
to select its own frequency, coupling ranging etc