Rockwell-automation DC3RD Digital Regenerative DC Drive User Guide 1/4 Manual de usuario descargar pdf (Pagina 54)

46 Troubleshooting

Problem Possible

Causes

Suggested

Solutions

Motor runs too fast

at maximum speed

setting

Motor will not reach

the desired speed

Motor pulsates or

surges under load

1. MAX SPD setting

is too high.

2. Motor field

connections are

loose (shunt wound

motors only).

1. MAX SPD setting

is too low.

2. IR COMP setting

is too low.

3. Motor is

overloaded.

1. IR COMP is set

too high.

2. Motor “bouncing”

in and out of torque

limit.

1. Recalibrate MAX

SPD.

2. Check motor field

connections.

1. Increase MAX

SPD setting.

2. Increase the IR

COMP setting.

3. Check motor load.

Resize the motor if

necessary.

1. Adjust the IR

COMP setting slightly

CCW until the motor

speed stabilizes.

2. Make sure motor is

not undersized for

load; adjust FWD TQ

and REV TQ

trimpots.

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