Mitsubishi Electric Melservo MR-J5-A User Manual page 57

No. Startup sequence
3 Operation of the servo
motor alone by
command
(Position control mode)
4 Operation of the servo
motor alone by
command
(Speed control mode)
5 Operation of the servo
motor alone by
command
(Torque control mode)
6 Gain adjustment
7 Actual operation
Fault Investigation
The servo motor does Check the cumulative command
not operate. pulses on the status display.
The servo motor Check the cumulative command
operates in the opposite pulses on the status display.
direction.
The servo motor does Check the input voltage of VC
not operate. (Analog speed command) on the
status display.
Check the on/off status of input
signal with the external I/O signal
display.
Check [Pr. PC05 Internal speed 1]
to [Pr. PC11 Internal speed 7].
Check [Pr. PA11 Forward rotation
torque limit] and [Pr. PA12
Reverse rotation torque limit].
When TLA (Analog torque limit) is
usable, check the input voltage on
the status display.
The servo motor does Check the input voltage of TC
not operate. (Analog torque command) on the
status display.
Check the on/off status of input
signal with the external I/O signal
display.
Check [Pr. PC05 Internal speed 1]
to [Pr. PC11 Internal speed 7].
Check the value of [Pr. PC13
Analog torque command
maximum output]
Check [Pr. PA11 Forward rotation
torque limit] and [Pr. PA12
Reverse rotation torque limit].
Ripples (speed Follow the procedure shown
fluctuations) are large at below when adjusting the gain.
low speed. 1. Improve the auto tuning
responsiveness.
2. Repeat acceleration/
deceleration three times or more
to complete the auto tuning.
Large load inertia If the servo motor can be run
moment causes the safely, repeat acceleration/
servo motor shaft to deceleration three times or more
oscillate side to side.
to complete the auto tuning.
Position mismatch Confirm the cumulative command
occurs pulses, cumulative feedback
pulses, and actual servo motor
position.
Possible cause
1. The wiring is incorrect.
• For the open collector pulse
train input, 24 V DC power is
not supplied to OPC.
• LSP and LSN are not on.
2. A pulse is not inputted from the
controller.
The setting in [Pr. PA13] is
incorrect.
1. The wiring to the controller is
incorrect.
2. The setting in [Pr. PA14] is
incorrect.
The analog speed command is 0
V.
LSP, LSN, ST1, and ST2 are off.
The setting is "0".
The torque limit level is too low
against the load torque.
The torque limit level is too low
against the load torque.
The analog torque command is 0
V.
RS1 and RS2 are off.
The setting is "0".
The torque command level is too
low against the load torque.
The setting is "0".
Faulty gain adjustment.
Faulty gain adjustment.
Pulses are miscounted due to
noise and other factors.
4 STARTUP
4.3 Troubleshooting at startup
Reference
Page 28 Status
display
4
Page 40
External I/O signal
display
Refer to "Speed
control mode (S)" in
the following
manual.
MR-J5 User's
Manual (Function)
Refer to "Torque
control mode (T)" in
the following
manual.
MR-J5 User's
Manual (Function)
MR-J5 User's
Manual
(Adjustment)
Page 56
Investigating the
cause of a position
mismatch
55