Rockwell-automation 150 USE MN/SMC DIALOG + CONTROLLER Manual do Utilizador descarregar pdf (Página 154)

Troubleshooting

10-5

Table 10.E Miscellaneous Situations

Situation Possible Cause Possible Solutions

Motor current and

voltage fluctuates

with steady load

•Motor

• Energy Saver

• Erratic Load

• Verify type of motor as a standard

squirrel cage induction motor

• Set Energy Saver Off, then restart.

– If problem stops, replace

control module

– If problem persists, shut off

all

power to controller and

check connections

• Check load conditions

Erratic operation • Loose

connections

• Shut off

all

power to controller and

check for loose connections

Accelerates too fast • Starting time

•Initial torque

• Current limit

setting

•Kickstart

• Increase starting time

• Lower initial torque setting

• Decrease current limit setting

• Lower kickstart time or turn off

Accelerates too

slow

• Starting time

•Initial torque

• Current limit

setting

•Kickstart

• Decrease starting time

• Increase initial torque setting

• Increase current limit setting

• Increase kickstart time or turn off

Fan does not

operate

(97–1000A)

• Wiring

•Failed fan(s)

• Check wiring and correct if

necessary

•Replace fan(s)

Motor stops too

quickly with

Soft Stop option

• Time setting • Verify the programmed stopping

time and correct if or increase

Motor stops too

slowly with

Soft Stop option

• Stopping time

setting

• Misapplication

• Verify the programmed stopping

time and correct if necessary

• The Soft Stop option is intended to

extend

the stopping time for loads

that stop suddenly when power is

removed from the motor.

Fluid surges with

pumps still occur

with the Soft Stop

option

• Misapplication • Soft Stop ramps voltage down over

a set period of time. In the case of

pumps, the voltage may drop too

rapidly to prevent surges. A closed

loop system such as Pump Control

would be more appropriately

suited.

• Refer to Publication 150-911

Motor overheats • Duty cycle • Preset Slow Speed and Accu-Stop

options: Extended operation at

slow speeds reduces motor cooling

efficiency. Consult motor

manufacturer for motor limitations.

• Smart Motor Braking option:

Check duty cycle. Consult motor

manufacturer for motor limitations.

Motor short circuit • Winding fault • Identify fault and correct.

• Check for shorted SCR; replace if

necessary.

• Ensure power terminals are secure.

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