4.7 Viewing Efficiency and Loss Measurement Values
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4
Chapter 4 Viewing Measurement Values
Example: Inverter inputs are connected to CH 1 and CH 2, inverter outputs to CH 3 and CH 4 of the
instrument, analog output from the tachometer to rotation signal input CH B, and analog output from the
torque meter to torque signal input CH A.
How to connect torque meter or tachometer, see 8.5 ( p.174).
Measuring Efficiency and Loss of an Inverter and Motor
Connection Example
Wiring Mode Setting
Calculation Formula Setting
Required items: Requires the PW3390-03 (model with motor analysis and D/A output).
• L9438-50 Voltage Cord ×4
• 9272-05 Clamp On Sensor ×2...............input side
• CT6843-05 AC/DC Current Probe ×2 ....output side
• Tachometer ×1 .....With pulse output capability
• Torque Meter ×1
• L9217 Connection Cord ×2
Input side
Output side
Inverter
Motor
Tachometer
Torque
Meter
Wiring Mode 6
[3P3W2M] × 2 systems
Set Pin1 to P12,
and Pout1 to P34
Calculation Formula
Inverter 1 = 100 × P34/P12, Loss1 =P12 -P34
Motor 2 = 100 × Pm/P34, Loss2 =P34 -Pm
Total 3 = 100 × Pm/P12, Loss3 =P12 -Pm
Set Pin2 to P34,
and Pout2 to Pm
Set Pin3 to P12,
and Pout3 to Pm
The torque meter and tachometer should have the fastest possible output response time.
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