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7 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
traverse.
Exceed. Increase the rapid traverse time constant.
◯◯
Not exceed.
Check if the maximum rapid traverse rate
settings are correct. After changing the
setting, turn the NC power ON again.
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 collided 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 during
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 collided 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 collided.
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 saturated during acceleration/
deceleration.
The current is saturated during acceleration/
deceleration.
Check the investigation item No. 3.
◯
The current value during acceleration/
deceleration is appropriate.
Investigate the cause of the load fluctuation.
3
Can the acceleration/deceleration time constant be
changed?
The constant can be changed.
Increase the acceleration/ deceleration time
constant.
◯
The constant cannot be changed. Set to ignore collision detection method 2.
Alarm No.
5B
Safely limited: Commanded speed error
In safely limited mode, the commanded speed was detected to exceed the safely limited speed.
Investigation details Investigation results Remedies SV SP
1 Check the commanded speed on the NC side.
The commanded speed and safely limited
speed limit value are the same.
Reduce the commanded speed on the NC
side or increase the safely limited speed limit
value.
◯◯
The commanded speed is slower than the
safely limited speed.
Replace the drive unit.
Alarm No.
5D
Safely limited: Door state error
In safely limited mode, the door state signal from the NC and the same signal from the drive unit don't match. Otherwise, door
open state was detected in normal mode.
Investigation details Investigation results Remedies SV SP
1 Check the DI input timing.
Both NC side and drive unit side input timings
match one another within 500ms.
Review the DI input sequence.
Check if the cable for the DI input signal is
broken.
◯◯
NC side and drive unit side inputs do not
match one another within 500ms.
Investigate the wiring and connection
environment.