Rm-materials-handling VARIABLE SPEED CONTROLS ControlMaster NXT Service Manuale Utente Scaricare il pdf (Pagina 48)

R&M Materials Handling, Inc.

4501 Gateway Boulevard

Springfield, Ohio 45502

P.: (937) 328-5100

FAX: (937) 325

5319

48/53

R&M Materials Handling, I

nc. reserves the right to alter or amend the above information without notice.

Blink

Seven

times

X OFF

Other fault

Note: There is a pause after each time the green LED has finished blinking the error code sequence. After the pause, the

green LED starts blinking again.

The warning and fault code numbers and corresponding warnings and faults, possible causes and suggested

solutions are listed in the following table.

Code Warning or Fault Possible cause Solution

Over current / current

limit (stall)

• A sudden and significant load increase

has occurred

• There is a short circuit in the motor cable

• The motor is inadequate for the

application

• The motor parameters have been set

wrong

• Current limit activates

• Ramp time is too short

• Check the load of the motor

• Check the motor brake operation

• Check the connection of the motor cable

• Check the motor insulation

• Verify the correct parameters

• Check crane/trolley runway clearness

To reset: Power off and restart after 1 min.

Power supply under- or

over voltage, over

voltage at start

• The supply voltage is below 240VAC

• The supply voltage is unbalanced

• The deceleration time is too short

• The supply voltage is over 528 VAC

(480V+10%), has over voltage spikes or

not sinusoidal wave form

• Check that the supply voltage is not

unbalanced

• Check that the supply voltage level is

above 380VAC-15%. Use, for example,

autotransformer to boost the voltage

• Set a longer deceleration time

• Measure the supply voltage level and

wave form, use an autotransformer to

lower the voltage

• Check the braking resistor cable (model

006, not 003)

• Check the braking resistor type and

resistance (internal 120Ω, external 90Ω)

To reset: voltage must increase above the

limit OR power off and restart after 1 min.

Main voltage must be under 528 V

Frequency converter

Under / over temperature

• The crane is operated in a temperature

that is too low/high

• The cubicle/panel heating is not working

• The cubicle/panel isolation is broken or

the door is open

• The cubicle/panel cooling is not working

• Dust inside the frequency converter

• Broken cooling fan

• Check that the environment temperature

meets the crane’s requirements

• Check the cubicle/panel heating/cooling

systems and air flow. If cooling fan is not

working replace the frequency converter.

To reset: when the ambient temperature

rises above -10˚C OR drops below +40˚C.

Earth fault in motor

output

• The motor load is not symmetric

• There is an insulation failure in the motor

winding or motor cable

• Check the motor/motor cable insulation

(phase-ground, phase-phase)

To reset: power off and restart after 1 min

External stop / limit

warning

• Limit switch is activated

• The motor has overheated

• Loose or missing wire in DI6

• Parameter S5 setting

• Drive back from limit switch

• Wait until the motor is cooled down

To reset: Power off and restart after 1 min.

DC bus over voltage

• DC bus voltage has been too high

because of too short slowdown ramp time

• The tailwind load is too high or, in tandem

use, the other crane is pushing

• Check the braking resistor connection

• Increase the deceleration ramp time

(Switch group S3)

To reset: leave the controls at a neutral

position at least 0.5 second

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Rm-materials-handling VARIABLE SPEED CONTROLS ControlMaster NXT Service Manuale Utente Pagina 48

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