Alarm Messages; A0501 Current Limit Value; A0502 Overvoltage Limit Value; A0504 Inverter Overtemperature - Siemens MICROMASTER 440 Parameter Manual

Issue 01/06
5.2

Alarm Messages

Alarm messages are stored in parameter r2110 under their code number (e.g. A0503
= 503) and can be read out from there.

A0501 Current limit value

Cause
- the motor power rating does not correspond to the inverter power rating
- motor cables are too long
- ground fault
Diagnosis & Remedy
Please check the following:
- does the motor power rating (P0307) match the inverter power rating (r0206) ?
- are the limit values for the cable lengths maintained ?
- does the motor cable or motor have a short-circuit or ground fault ?
- do the motor parameters correspond to those of the motor being used ?
- stator resistance value (P0350) correct ?
- is the motor overloaded or is the rotor locked (cannot rotate) ?
- ramp-up time P1120 too low ?

A0502 Overvoltage limit value

Cause
- the overvoltage limit value has been reached (actual value of the DC link voltage r0026 greater than
r1242).
Diagnosis & Remedy
- if this alarm is permanently displayed, check the inverter input voltage.
- is the DC link voltage controller (Vdc_max controller) de-activated (refer to parameter P1240) ?
- short ramp times and/or large flywheel masses (moment of inertia) ?
A0503 Undervoltage limit value
Cause
- line supply has failed.
- line voltage and therefore also the DC link voltage (r0026) below the defined limit value (refer to
parameter r0026).
Diagnosis & Remedy
- check the line voltage.

A0504 Inverter overtemperature

Cause
- alarm threshold of the inverter heatsink temperature (P0614) was exceeded; this results in a reduction
of the pulse frequency and/or the output frequency (dependent on the parameterization in (P0610).
Diagnosis & Remedy
Please check the following:
- is the ambient temperature within the permissible limits ?
- are the load and load duty cycle within the permissible limits ?
A0505 Inverter I2T
Cause
- overload alarm limit P0294 is exceeded (refer to utilization r0036)
- the pulse frequency and/or the output frequency is reduced as a function of the setting of parameter
P0290.
Diagnosis & Remedy
- check whether the load duty cycle lies within the permissible limits.
A0506 Inverter load duty cycle
Cause
- difference between the temperature at the heatsink and IGBT exceeds the alarm limit values.
Diagnosis & Remedy
- please ensure that the load duty cycle and load surge lie within the permissible limits.
MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0
Faults and Alarms
315