FORMA: Service & Maintenance manual - rev. 3.0
Page 6.21
6.3.9. T
HE INVERTER DISPLAY DOES NOT SHOW ANY ERROR
This is an anomalous error condition in which the machine display reports an error but the inverter
has not generated an error.
Is there an alarm signal
asserted at the output of the
driver board?
NO
YES
2
No error displayed
Replace the inverter
1
Is there an alarm signal
asserted at the inverter
output?
YES
Is there an alarm signal
asserted at the input to the
driver board?
Check and/or replace cable
FR-7
Replace the driver
interface board
NO
YES
Is there an alarm asserted
at the input to the display?
Check and/or replace cable
FR-11
NO
YES
Replace the CPU board
3
5
Is there an alarm on trailing
connector CN28?
YES
Check and/or replace cable
FR-12
NO
4
NO
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
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