6. TROUBLESHOOTING International English
MICROMASTER 420 Operating Instructions 95
6SE6400-5AA00-0BP0
Fault Code Description Possible Causes Diagnosis & Remedy
F0051 Parameter EEPROM
Fault
Reading or writing of the non-
volatile parameter storage has
failed.
1. Factory reset and new
parameterization.
2. Change inverter.
F0052 Powerstack Fault Reading of the powerstack
information has failed or the data is
invalid
Change inverter.
F0060 Asic Timeout Software error 1. Acknowledge fault
2. Change inverter if repeated.
F0070 Communications board
setpoint error
No setpoint received from
communications board during
telegram off time
1. Check connections to the
communications board.
2. Check the master
F0071 No Data for USS
(RS232 link) during
Telegramm Off Time
No response during telegram off
time
1. Check connections to the
communications board.
2. Check the master
F0072 No Data from USS
(RS485 link) during
Telegram Off Time
No response during telegram off
time
1. Check connections to the
communications board.
2. Check the master
F0080 Analogue input - lost
input signal
Analogue input - lost input signal Check connection to analogue input
F0085 External Fault External fault is triggered via
terminal inputs
Disable terminal input for fault trigger.
F0101 Stack Overflow Software error or processor failure 1. Run self test routines.
2. Change inverter
F0221 PI Feedback below
minimum value
PI Feedback below minimum value
P2268
1. Change value of P2268.
2. Adjust feedback gain.
F0222 PI Feedback above
maximum value
PI Feedback above maximum
value P2267
1. Change value of P2268.
2. Adjust feedback gain.
F0450
(Service mode
only)
BIST Tests Failure Fault 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. Vector only
16 - The Internal Ram has failed its
check on power-up
1. Inverter may run but certain
actions will not function correctly.
2. Replace inverter.
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