Mitsubishi Electric C70 Setup Manual page 587

MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Alarm No.
Feedback error 2
43
Excessive difference was detected in position data between the motor side detector and the machine side detector.
Investigation details
Check if the connecting pulley ratio of the
1 spindle end to ABZ pulse encoder meets the
machine specifications.
Check the setting value of the spindle
2
parameter from SP057 to SP064.
Check the spindle parameter SP054 setting
3
value.
Jiggle the detector connectors (drive unit
4 side and detector side) and check if they are
disconnected.
Is the detector cable wired in the same
conduit as the motor's power cable, or are
5
the two cables laid in parallel near each
other?
Is the motor FG wire connected only to the
6 drive unit which drives it?
(Is the motor grounded to one point?)
Turn the power OFF, and check the detector
7 cable connection with a tester. (Is the cable
shielded?)
Replace with another unit, and check
8 whether the fault is on the unit side or
detector side.
Check if there is any abnormality in the
detector's ambient environment.
9
(Ex. Ambient temperature, noise,
grounding)
10 Check SP019, SP020, SV019, and SV020.
11 Check the alarm No. "1B" items.
Alarm No. Fan stop
45 A cooling fan built in the drive unit stopped, and overheat occurred in the power module.
Investigation details
Turn the unit power ON again, and confirm
the rotation of the fan.
Note) Assure more than 10 seconds for the
time from when the power is turned OFF till
1 when it is turned ON. For the fan used for
the drive unit, assuring more than 10
seconds for the time from when the power is
turned OFF till when it is turned ON is
required.
Check if the connector connected to a fan is
2
loosened or disconnected in the unit.
Check if oil or cutting chips are adhered to
3
the fan.
570
Investigation results
The pulley ratio of the spindle end to
encoder is 1:1.
The spindle end and encoder are not equal
in the pulley ratio.
No problem.
The correct values are not set.
The correct values are set.
V-belt is used for the spindle end driving.
Other than V-belt (gears or timing belt) is
used for the spindle end driving.
SP054 is set corresponding to the machine
specifications.
The connector is disconnected (or loose).
The connector is not disconnected.
The cables are wired near each other. Noise
is entering from the power cable.
The wires are sufficiently separated.
The motor FG wire is grounded on the motor
side.
The motor is grounded to one point.
The connection is faulty.
The connection is normal.
The alarm is on the drive unit side.
The alarm is on the detector side.
Take remedies according to the causes of the abnormality in the ambient environment.
Parameter is set incorrectly.
Parameter is set correctly.
Investigation results
The fan is rotating, and an alarm did not
occur again.
The fan did not rotate. Or, an alarm
occurred again.
[1]The connector is loosened.
[2]The connector is disconnected.
[1]The connector is not loosened.
[2]The connector is not disconnected.
Oil or cutting chips are adhered.
Oil or cutting chips are not adhered.
The cable may be broken.
Remedies
Check the parameter setting.
Check the parameter setting.
When the encoder is smaller than the
spindle end in the pulley ratio, replace the
pulley.
Check the investigation item No. 2.
Correctly set.
Check the investigation item No. 3.
Set "-1" to the spindle parameter "SP054".
Set "360" to the spindle parameter "SP054".
Check the investigation item No. 4.
Correctly install.
Check the investigation item No. 5.
Improve the cable wiring.
Divide it by a FG shield.
Check the investigation item No. 6.
Ground the motor to one point, connecting
the wires together on the drive unit side.
Check the investigation item No. 7.
Replace the detector cable.
Check the investigation item No. 8.
Replace the drive unit.
Check the investigation item No. 9.
Correctly set.
Check the investigation item No. 11.
Remedies
Continue to use.
The power may be turned ON without
assuring more than 10 seconds for the time
from when the power is turned OFF till when
it is turned ON.
Leave for more than 10 seconds, and turn
the power ON again.
Check the investigation item No. 2.
Correctly connect the connector.
Replace the fan.
Check the investigation item No. 3.
Improve the use environment and
replace the drive unit.
Replace the fan.
Replace the drive unit.
SV SP
SV SP