Operating instructions

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6 Troubleshooting Issue B1

MICROMASTER 420 Operating Instructions

72 6SE6400-5AA00-0BP0

6.4 MICROMASTER 420 alarm messages

Fault Possible Causes Diagnose & Remedy Reac-

tion

A0501

Current Limit

Ø Motor power does not correspond

to the inverter power

Ø Motor leads are too short

Ø Earth faults

1. Check whether the motor power corresponds

to the inverter power

2. Check that the cable length limits have not

been exceeded

3. Check motor cable and motor for short-

circuits and earth faults

4. Check whether the motor parameters

correspond with the motor being used

5. Check the stator resistance

6. Increase the ramp-up-time

7. Reduce the boost

8. Check whether the motor is obstructed or

overloaded

A0502

Overvoltage

limit

Ø Mains supply too high

Ø Load regenerative

Ø Ramp-down time too short

1. Check that mains supply voltage is within

allowable range

2. Increase ramp down times

Note:

Vdc-max controller is active, ramp-down times will

be automatically increased

A0503

Undervoltage

Limit

Ø Mains supply too low

Ø Short mains interruption

Check main supply voltage (P0210) --

A0504

Inverter Over-

temperature

Warning level of inverter heat-sink

temperature (P0614) is exceeded,

resulting in pulse frequency reduction

and/or output frequency reduction

(depending on parametrization in

(P0610)

1. Check if ambient temperature is within

specified limits

2. Check load conditions and duty cycle

3. Check if fan is turning when drive is running

A0505

Inverter I

Warning level is exceeded; current

will be reduced if parameterized

(P0610 = 1)

Check if duty cycle is within specified limits --

A0506

Inverter Duty

Cycle

Heatsink temperature and thermal

junction model are outside of

allowable range

Check if duty cycle are within specified limits --

A0511

Motor Over-

temperature I

Motor overloaded Check the following:

1. P0611 (motor i

t time constant) should be set

to appropriate value

2. P0614 (Motor i

t overload warning level)

should be set to suitable level

3. Are long periods of operation at low speed

occuring

4. Check that boost settings are not too high

A0541

Motor Data

Identification

Active

Motor data identification (P1910)

selected or running

Wait until motor identification is finished --

A0600

RTOS Overrun

Warning

Software error

A0700

CB warning 1