RUN MED: Service & Maintenance Manual - rev. 1.0
Page 6.18
6.6.3. ERROR UU
This error indicates low voltage problems on the AT driver supply line.
This error can be caused by a failure of the belt motor encoder.
Is the supply v oltage at the
input to the AT driver correct?
Does the machine resume
correct operation af ter being
switched of f f or 1 minute?
YES
Probable low line voltage.
The machine is OK
Replace the AT driver
board
NO
UU
1
YES
NO
Check if the encoder works
properly by carrying out the
troubleshooting procedure
"The encoder does not
work properly "
Correct the cause of the
excessively low line voltage
This error can be generated by even transient glitches in the mains supply due to
overloading or other factors. Therefore it can be useful to check, in the inverter error
articular care with the
ck
ls of the connector J1 of the AT driver board. The
measured voltage should be 220 VAC.
log, the value of mains voltage recorded at the time when the error occurred.
Follow the procedure step by step to correctly diagnose the problem. Take p
che s highlighted by circled numbers, which are described in detail below:
Place the tester probes across termina(1)
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