4 Troubleshooting Issue 07/04
MICROMASTER 420 Operating Instructions
152 6SE6400-5AA00-0BP0
WARNING
♦ Repairs on equipment may only be carried out by Siemens Service, by repair
centers
authorized by Siemens or by qualified personnel who are thoroughly
acquainted with all the warnings and operating procedures contained in this
manual.
♦ Any defective parts or components must be replaced using parts contained in
the relevant spare parts list.
4.1 Troubleshooting with the SDP
Table 4-1 explains the
meaning of the various
states of the LEDs on
the SDP.
Table 4-1 Inverter conditions indicated by the LEDs on the SDP
Mains not present
Fault inverter temperature
Ready to run
Warning current limit - both
LEDs twinkling
same time
Inverter fault - other than the
ones listed below
Other warnings - both LEDs
twinkling
alternatively
Inverter running
Undervoltage trip /
undervoltage warning
Fault overcurrent
Drive is not in ready state
Fault overvoltage
ROM failure - Both LEDs
flashing
same time
Fault motor overtemperature
RAM failure - Both LEDs
flashing
alternatively
LEDs for indicating the drive
state
Off
On
approx. 0,3 s, flashing
approx. 1 s, twinkling
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