FORMA: Service & Maintenance manual - rev. 3.0
Page 6.25
6.6. THE DISPLAYED SPEED IS INCORRECT
The machine displays this error if:
• the calibration is incorrect;
• there are HW problems with the CPU board – driver board – inverter and motor group.
THE DISPLAYED SPEED IS
INCORRECT
Is the relationship between
the displayed speed and the
inverter frequency correct?
Is the inverter control
voltage correct?
YES
NO
YES
Replace the inverter
1
3
NO
The machine is operating
correctly
Is the inverter control
voltage at the output of the
inverter interface board
correct?
Check and/or replace
cable FR-7
YES
4
NO
A
Check the inverter
parameters setting and
regulate the speed
2
5
Is the inverter control PWM
signal at the input of the
inverter interface board
correct?
YES
Replace the inverter
interface board
NO