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PA3000 Four-channel, Multi-phase AC/DC Power Analyzer
Efficiency Testing Three Phase Applications
DEMONSTRATION GUIDE
Efficiency Testing Three Phase Applications
This example demonstrates a simple method to make efficiency measurements on a three phase
motor drive. Similar principles can also be applied to efficiency testing on any three phase inverters
and other DC-AC converters.
V
ol
ts
Time
A
mp
s/
V
ol
ts
Time
To
rq
u
e
Speed
3
∅
INPUT
3
∅
PWM OUTPUT
MOTOR DRIVE
MOTOR
DYNAMOMETER
TORQUE
AND SPEED
PA3000 POWER ANALYZER (FRONT PANEL)
METHOD 1: EFFICIENCY MEASUREMENTS ON THREE PHASE PWM MOTOR DRIVE
(PA3000 DIRECT)
This method demonstrates three phase power and efficiency measurements on a single
phase input and three phase output PWM motor drive directly on the PA3000 display.
WHAT YOU WILL NEED — METHOD 1
•
PA3000 Power Analyzer
•
BB1000 Break Out Box
•
Three Phase Inverter (Motor Drive)
•
AC Source (Optional)
•
4mm Safety Leads
TEST SETUP
The following steps describe the process to set up the efficiency measurement on
a single phase input PWM motor drive using the PA3000.
1. Connect the single phase AC input on the PWM motor drive to the first channel of the
PA3000 using a Tektronix BB1000 Breakout Box as shown in wiring diagram.
– The breakout box taps into the current signal and measures the voltage across the input
terminals. It makes it easier and safer to connect input the AC signal on the DUT with the
4mm safety leads provided with the PA3000.
Figure 2-1. Three Phase Efficiency Testing on a PWM Motor Drive.
WATCH VIDEO
How to Make Efficiency
Measurements on a Three
Phase Motor Drive
www.tek.com/
effciency3ph_video
