
PPA55xx Quick User Guide
Page 9
3.1 PPA55xx Display Key Functions
ACQU
Wiring:
Acquisition Control: Used for configuring inputs
appropriate to source and nature of signals being
analyzed
Single Phase 1
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
2 Phase 2 Wattmeter
In the 2 phase 2 wattmeter configuration, the
voltages are measured relative t
phase input,
with a single frequency reference
selected within the frequency reference parameter
(see page 8)
3 Phase 2 Wattmeter
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 neutra
synthesiz
ed phase 3 current. The advantage of this
connection method is that 3 phase power can be
measured with only 2 wattmeters
3 Phase 3 Wattmeter
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
di
rectly and phase to phase voltages are also
computed
Single Phase 2
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
Single Phase 3
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, u
measure a DC bus plus channels 2 & 3 to measu
3 phase inverter output. CH3
can be set as an
additional connection for Torque & Speed to
supplement the existing "EXT"
the rear panel
. This mode essentially facilitates
independent frequency synchronisation of CH3
Independent
In independent wiring mode each phase can be
selected as an individual analyzer enabling the ability
to select its own frequency, coupling ranging etc