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Input phasing check – Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) User Manual

Page 93

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Rockwell Automation Publication 7000-IN006B-EN-P - May 2013

89

Commissioning the Drive Chapter 5

Input Phasing Check

There are 9 voltage test points on the ACB board that will allow you to look at
each voltage level individually.

These test points are labeled as follows:

Table 1 - ACB Test Points and Associated Voltage Signals

All of these test points can be measured to either the Analog Ground (AGND)
on the board or the TE ground in the low voltage section. You can use V2uv as
your reference (trigger on this waveform) and verify all the other test points using
the table above. It is easier to use zero crossings on your oscilloscope as the
reference points when checking the phase shifts.

Verify the following relationships:

1. V and W in each bridge should be lagging U by 120° and 240°, respectively.
2. 3U, 3V, and 3W should be lagging 2U, 2V, and 2W by 20° (-20°),

respectively.

Test Point Description

Isolation Transformer:

Secondary Phasing and Bridge

Phase Relationship

with respect to V2uv

(2U)

V2uv

2u

Master

0

°

V2vw

2v

Master

-120

°

V2wu

2w

Master

-240

°

V3uv

3u

Slave 1

-20

°

V3vw

3v

Slave 1

-140

°

V3wu

3w

Slave 1

-260

°

V4uv

4u

Slave 2

+20

°

V4vw

4v

Slave 2

-100

°

V4wu

4w

Slave 2

-220

°