Cormach MEC 20 - Troubleshooting

Technical Support Manual – 05/2018 Rel. 2.1.3 Page 34
10. TROUBLESHOOTING
Table 10.1: Troubleshooting table
Component
Problem
Cause
Solution
ENCODER DISC
• It does not read all the positions (0 ÷
255).
• The shaft does not stop rotating.
• The shaft performs a ½ turn and then
stops.
• Encoder disc dirty.
•
Encoder disc cable
interrupted.
• Encoder board burnt.
• Clean the encoder disc.
• Replace the board and
then the cable.
PICK-UP SIGNALS
•
The values displayed are too high.
• The values displayed are too low.
• The value displayed is 0.
The value of the signals must range
between 70 ÷ 110.
• Connection cable not
welded on the pick-up.
•
Connection cable not
connected to CPU.
• Pick-up over compressed.
•
Weld the cable to the
pick-up.
•
Check the correct
connection of the pick-
up cable to the CPU.
•
Remove the
compression springs and
make sure that the pick-
up moves freely.
DISPLAY
• One or more segments fail to switch
on.
• CPU board burnt. • Replace CPU board.
KEYBOARD
•
One or more keys failed.
•
CPU board burnt.
•
Replace CPU board.
VFC
• The values displayed are too high.
• The values displayed are too low.
• The value displayed is 0.
•
When knocking the machine the
values do not change.
The value of the VFC must range between
40.0 ÷ 44.0.
•
Connection cable not
welded on the pick-up.
•
Connection cable not
connected to CPU.
• Pick-up too compressed.
• Weld the cable to the
pick-up.
•
Check the correct
connection of the pick-
up cable to the CPU.
•
Remove the
compression springs and
make sure that the pick-
up moves freely.
SENSORS
• The sensors fail to detect the wheel
dimensions.
• Sensors deactivated.
• Sensor cable interrupted.
• Sensor board burnt (the
sensor calibration program
does not display the
calibration values).
• Re-
activate the sensors
(See paragraph 4
"PARAMETERS MENU
ACCESS").
• Replace the interrupted
cable.
• Replace sensor board.
MACHINE
• The machine does not switch on. • Fuse on socket.
• Power supply.
• Power supply board.
•
Check and replace the
fuse.
• Check and replace power
supply.
• Check and replace power
board.
MOTOR
•
Short-circuited motor.
The fuse
blows upon activation of the motor.
•
Disconnect the motor from
the power board.
•
Replace the motor.
Table T10.2: Parameter reference values
Parameters
Value
Unit of measurement
Rotation speed
135 ÷ 145
RPM
Pick-up signal A
70 ÷ 110
CPU-C1C.X internal unit
Pick-up signal B
70 ÷ 110
CPU-C1C.X internal unit
Frequency of the converter voltage-frequency
40.0 ÷ 44.0
kHz