Rockwell Automation MinPak Plus DC Drive User Manual User Manual

Page 38

5:7

Remove AĆC power at disconnect.

Remove leads A1, A2

Check motor leads A1 and A2 for grounds

Verify connection of transformer leads H1 to

51 and H2 to 52

Are

they wired

correctly?

Place the common of ohmmeter on terminalā

7, andācheckāforāa short at terminals L1āandāL2.

Reverse the leads and repeat the test.

Were

any shorts

found?

An Oscilloscope is needed for further testing.

Leave motor leads disconnected and set up

drive as a voltage regulator.

Remove the gate firing connector.

Place oscilloscope leads on pins G1 and L1,

then apply power.

Start the drive and monitor the waveform.

Repeat this test for the following set of pins:

G2 L2, G3 47 and G4 47.

Do the

waveforms

match Figure

FC1?

Possible power cube breaking done under

load, see note #1

End

DANGER

SOME OF THE FOLLOWING CHECKS AND PROCEDURES REQUIRE THE POWER TO BE ON. EXERCISE

EXTREME CARE AS HAZARDOUS VOLTAGE EXISTS. FAILURE TO OBSERVE THIS PRECAUTION COULD

RESULT IN SEVERE BODILY INJURY OR LOSS OF LIFE.

Start

Correct

Problem

Fixed?

Done

Replace the

power cube

Fixed?

Done

Yes

Replace

Regulator

Fixed?

Yes

Note #1: Contact local sales/service office.
*Ground conditions = 500 KĆOhms or less to ground.

Yes

Typical Scope Reading Gate Pulses

G to K GĆWHT(+), KĆRED(Ć)

Done

Figure FC1

Yes

Any

Grounds

Found

Repair

Grounds

Fixed?

Done

Yes

16.7 M.S.

Figure 5Ć5. Fuse Blows After Start.