Siemens Micromaster 420 Faults and Alarms

Original article — Siemens Micromaster 420 Fault Codes.

A blog we posted earlier this week about the Micromaster 420 troubleshooting referenced the Faults and Alarms list for the Micromaster series, so we decided that it would make sense to make the list of Micromaster 420 Faults and Alarms directly available. This is from the corresponding manual for the Micromaster 420 series, but it is buried within the manual which most people most likely don’t even have. Hopefully this helps with your troubleshooting, and for replacement drives or more info the full series of Micromaster 420 drives is listed here and you can also email sales@mroelectric.com.

MICROMASTER 420 fault messages
In the event of a failure, the inverter switches off and a fault code appears on the
display.
NOTE
To reset the fault code, one of three methods listed below can be used:
1. Cycle the power to the drive.
2. Press the button on the BOP or AOP.
3. Via Digital Input 3 (default setting)

Fault Possible Causes Diagnose & Remedy Reaction F0001
Overcurrent- Motor power does not correspond
to the inverter power
- Motor lead short circuit
- Earth faultCheck the following:
1. Motor power (P0307) must correspond to inverter power (P0206)
2. Cable length limits must not be exceeded
3. Motor cable and motor must have no short- circuits or earth faults
4. Motor parameters must match the motor in use
5. Value of stator resistance (P0350) must be correct
6. Motor must not be obstructed or overloaded
- Increase the ramp time
- Reduce the boost levelOFF2F0002
Overvoltage- DC-link voltage (r0026) exceeds
trip level (P2172)
- Overvoltage can be caused
either by too high main supply
voltage or if motor is in regenerative mode
- Regenerative mode can be cause
by fast ramp downs or if the
motor is driven from an active loadCheck the following:
1. Supply voltage (P0210) must lie within limits indicated on rating plate
2. DC-link voltage controller must be enabled
(P1240) and parameterized properly
3. Ramp-down time (P1121) must match inertia of loadOFF2F0003
Undervoltage- Main supply failed
- Shock load outside specified
limitsCheck the following:
1. Supply voltage (P0210) must lie within limits indicated on rating plate
2. Supply must not be susceptible to temporary failures or voltage reductionsOFF2F0004
Inverter Over- temperature- Ambient temperature outside of
limits,
- Fan failureCheck the following:
1. Fan must turn when inverter is running
2. Pulse frequency must be set to default value
3. Air inlet and outlet points are not obstructed Ambient temperature could be higher than specified for the inverterOFF2F0005
Inverter I2t- Inverter overloaded
- Duty cycle too demanding
- Motor power (P0307) exceeds
inverter power capability (P0206)Check the following:
1. Load duty cycle must lie within specified limits
2. Motor power (P0307) must match inverter power (P0206)OFF2F0011
Motor Over- temperature I2t- Motor overloaded
- Motor data incorrect
- Long time period operating at
low speeds1. Check motor data
2. Check loading on motor
3. Boost settings too high
(P1310,P1311, P1312)
4. Check parameter for motor thermal time constant
5. Check parameter for motor I2t warning levelOFF1F0041
Stator resistance measurement failureStator resistance measurement failure1. Check if the motor is connected to the inverter
2. Check that the motor data has
been entered correctlyOFF2F0051
Parameter
EEPROM FaultReading or writing of the non-volatile parameter storage has failed1. Factory reset and new parameterization
2. Change inverterOFF2F0052
Powerstack
FaultReading of the powerstack information has failed or the data is
invalidChange inverterOFF2F0060
Asic TimeoutInternal communications failure1. Acknowledge fault
2. Change inverter if repeatedOFF2F0070
Communicatio ns board setpoint errorNo setpoint received from
communications board during telegram off time1. Check connections to the
communications board
2. Check the masterOFF2F0071
No Data for USS (RS232 link) during Telegramm Off TimeNo response during telegram off time
via USS (BOP link)1. Check connections to the
communications board
2. Check the masterOFF2F0072
No Data from USS (RS485 link) during Telegram Off TimeNo response during telegram off time
via USS (COM link)1. Check connections to the
communications board
2. Check the masterOFF2F0080
Analogue input — lost input signal- Broken wire
- Signal out of limitsCheck connection to analogue inputOFF2F0085
External FaultExternal fault is triggered via terminal
inputsDisable terminal input for fault triggerOFF2F0101
Stack
OverflowSoftware error or processor failure1. Run self test routines
2. Change inverterOFF2F0221
PI Feedback below mini- mum valuePID Feedback below minimum value
P22681. Change value of P2268
2. Adjust feedback gainOFF2F0222
PI Feedback above maximum
valuePID Feedback above maximum value
P22671. Change value of P2267
2. Adjust feedback gainOFF2F0450
(Service mode only)
BIST Tests
FailureFault value
1 Some of the power section tests have failed
2 Some of the control board tests have failed
4 Some of the functional tests
have failed
8 Some of the IO module tests have failed
16 The Internal RAM has failed its check on power-up1. Inverter may run but certain
actions will not function correctly
2. Replace inverterOFF2

MICROMASTER 420 alarm messages

FaultPossible CausesDiagnose & RemedyReactionA0501
Current Limit- Motor power does not
correspond to the inverter power
- Motor leads are too short
- Earth faults1. 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- Mains supply too high
- Load regenerative
- Ramp-down time too short1. 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- Mains supply too low
- Short mains interruptionCheck main supply voltage (P0210) — A0504
Inverter Over- temperatureWarning 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 I2tWarning level is exceeded; current
will be reduced if parameterized
(P0610 = 1)Check if duty cycle is within specified limits — A0506
Inverter Duty
CycleHeatsink temperature and thermal junction model are outside of
allowable rangeCheck if duty cycle are within specified limits — A0511
Motor Over- temperature I2tMotor overloadedCheck the following:
1. P0611 (motor i2t time constant) should be set to appropriate value
2. P0614 (Motor i2t 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 ActiveMotor data identification (P1910)
selected or runningWait until motor identification is finished — A0600
RTOS Overrun
WarningSoftware errorA0700
CB warning 1CB (communication board) specificSee CB user manual — A0701
CB warning 2CB (communication board) specificSee CB user manual — A0702
CB warning 3CB (communication board) specificSee CB user manual — A0703
CB warning 4CB (communication board) specificSee CB user manual — A0704
CB warning 5CB (communication board) specificSee CB user manual — A0705
CB warning 6CB (communication board) specificSee CB user manual — A0706
CB warning 7CB (communication board) specificSee CB user manual — A0707
CB warning 8CB (communication board) specificSee CB user manual — A0708
CB warning 9CB (communication board) specificSee CB user manual — A0709
CB warning 10CB (communication board) specificSee CB user manual — A0710
CB communi- cation errorCommunication with CB (communication board) is lostCheck CB hardware — A0711
CB configu- ration errorCB (communication board) reports a
configuration errorCheck CB parameters — A0910
Vdc-max controller de- activatedVdc max controller has been de-
activated, since controller is not capable of keeping DC-link voltage (r0026) within limits (P2172)
- Occurs if main supply voltage
(P0210) is permanently too high
- Occurs if motor is driven by an
active load, causing motor to
goes into regenerative mode
- Occurs at very high load inertias,
when ramping downCheck the following:
1. Input voltage (P0756) lies within range?
2. Load must match
In certain cases apply braking resistor — A0911
Vdc-max controller activeVdc max controller is active; so ramp- down times will be increased
automatically to keep DC-link voltage
(r0026) within limits (P2172)1. Check parameter inverter input voltage
2. Check ramp-down times — A0912
Vdc-min controller activeVdc min controller will be activated if
DC-link voltage (r0026) falls below minimum level (P2172)
- The kinetic energy of the motor
is used to buffer the DC-link
voltage, thus causing deceleration of the drive!
- So short mains failures do not
necessarily lead to an
undervoltage trip — A0920
ADC parameters not set properlyADC parameters should not be set to
identical values, since this would produce illogical results.
- Index 0: Parameter
settings for output
identical
- Index 1: Parameter
settings for input
identical
- Index 2: Parameter
settings for input do not
correspond to ADC typeAnalogue input parameters should not be set to
the same value as each other — A0921
DAC parameters not set
properlyDAC parameters should not be set to identical values, since this would
produce illogical results.
- Index 0: Parameter settings for
output identical
- Index 1: Parameter settings for
input identical
- Index 2: Parameter settings for
output do not correspond to DAC typeAnalogue Output parameters should not be set to the same value as each other — A0922
No load applied to inverter. No Load is applied to the
inverter
- As a result, some functions may
not work as under normal load
conditions
Low output voltage eg when 0 boost applied at 0 Hz1. Check that load is applied to the inverter
2. Check motor parameters correspond to motor attached
3. As a result, some functions may not work correctly, because there is no normal load condition — A0923
Both JOG Left and JOG Right are requestedBoth JOG right and JOG left
(P1055/P1056) have been requested. This freezes the RFG output frequency at its current value. JOG right and JOG left signals active together

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