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6 Troubleshooting
MITSUBISHI CNC
Alarm No.
56
Commanded speed error
In C axis control mode, excessive NC commanded speed was detected.(In C axis control mode)
Investigation details Investigation results Remedies SV SP
1
Check the rotation speed displayed on
the spindle drive monitor to see if the
C axis rotation speed exceeds 1.15
times of the set speed during rapid tra-
verse.
Exceed.
Increase the rapid traverse time con-
stant.
Not exceed.
Alarm No.
58
Collision detection 1: G0
When collision detection function (set to SV060) was valid, the disturbance torque in rapid traverse (G0)
exceeded the collision detection level.
Investigation details Investigation results Remedies SV SP
1
Check whether the machine has col-
lided during G0 operation.
A collision has occurred at the table,
turret or spindle head in the machine
during movement.
Check the machining program and
soft limit settings.
There is no collision at the table, turret
and spindle head in the machine dur-
ing movement
Adjust the tolerable disturbance
torque SV060.
(Note) Set the detection level to be 1.5
times or more of the maximum torque.
Alarm No.
59
Collision detection 1: G1
When collision detection function was valid (SV035.c1G1 was set), the disturbance torque in cutting feed
(G1) exceeded the collision detection level.
Investigation details Investigation results Remedies SV SP
1
Check whether the machine has col-
lided during G0 operation.
The machine has collided during
movement.
Check the machining program and
soft limit settings.
The machine has not collided.
Increase the detection level (SV035.
clG1).
G1 collision detection level
=SV060×c1G1(001 to 111)
(Note) Set the detection level larger
than the maximum cutting load.
Alarm No.
5A
Collision detection 2
When collision detection function was valid, the command torque reached the max. motor torque.
Investigation details Investigation results Remedies SV SP
1
Check whether the machine has col-
lided.
The machine has collided.
Check the machining program and
soft limit settings.
The machine has not collided. Check the investigation item No. 2.
2
Check whether the current value on
the NC Servo Monitor screen is satu-
rated during acceleration/decelera-
tion.
The current is saturated during accel-
eration/deceleration.
Check the investigation item No. 3.
The current value during acceleration/
deceleration is appropriate.
Investigate the cause of the load fluc-
tuation.
3
Can the acceleration/deceleration
time constant be changed?
The constant can be changed.
Increase the acceleration/ decelera-
tion time constant.
The constant cannot be changed.
Set to ignore collision detection meth-
od 2.
Alarm No.
5B
Safety observation: Commanded speed error
In safety monitoring mode, the commanded speed was detected to exceed the safe speed.
Investigation details Investigation results Remedies SV SP
1
Check the commanded speed on the
NC side.
The commanded speed and safe
speed limit value are the same.
Reduce the commanded speed on the
NC side or increase the safe speed
limit value.
The commanded speed is slower than
the safe speed.
Replace the drive unit.