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Mitsumi electronic MR-J3- A Manual De Usuario

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4 -  13 
4. STARTUP 
 
4.3.5 Actual operation 
Start actual operation after confirmation of normal operation by test operation and completion of the 
corresponding parameter settings. 
 
4.3.6 Trouble at start-up 
CAUTION 
Excessive adjustment or change of parameter setting must not be made as it will 
make operation instable. 
 
 
POINT 
 
Using the MR Configurator, you can refer to unrotated servo motor reasons, etc. 
 
 
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action. 
 
No.  Start-up sequence 
Fault 
Investigation 
Possible cause 
Reference 
1 Power 
on 
LED is not lit. 
LED flickers. 
Not improved if connectors CN1, 
CN2 and CN3 are disconnected. 
1. Power supply voltage fault 
2. Servo amplifier is faulty. 
 
Improved when connectors CN1 
is disconnected. 
Power supply of CN1 cabling is 
shorted. 
Improved when connector CN2 is 
disconnected. 
1. Power supply of encoder 
cabling is shorted. 
2. Encoder is faulty. 
Improved when connector CN3 is 
disconnected. 
Power supply of CN3 cabling is 
shorted. 
Alarm occurs. 
Refer to section 9.2 and remove cause. 
Section 9.2
2 
Switch on servo-
on (SON). 
Alarm occurs. 
Refer to section 9.2 and remove cause. 
Section 9.2
Servo motor shaft is 
not servo-locked 
(is free). 
1. Check the display to see if the 
servo amplifier is ready to 
operate. 
2. Check the external I/O signal 
indication (section 6.7) to see if 
the servo-on (SON) is ON. 
1. Servo-on (SON) is not input. 
(Wiring mistake) 
2. 24VDC power is not supplied to 
DICOM. 
Section 6.7
3 
Switch on forward 
rotation start (ST1) 
or reverse rotation 
start (ST2). 
Servo motor does 
not rotate. 
Call the status display or MR 
Configurator and check the input 
voltage of the analog speed 
command (VC). 
Analog speed command is 0V. 
Section 6.3
Call the external I/O signal display 
(section 6.7) and check the 
ON/OFF status of the input signal.
LSP, LSN, ST1 or ST2 is off. 
Section 6.7
Check the internal speed 
commands 1 to 7 
(parameters No.PC05 to PC11). 
Set value is 0. 
Section 
5.1.9 
Check the forward rotation torque 
limit (Parameter No.PA11) or 
reverse rotation torque limit 
(Parameter No.PA12) 
Torque limit level is too low as 
compared to the load torque. 
When the analog torque limit 
(TLA) is usable, check the input 
voltage on the status display or 
MR Configurator. 
Torque limit level is too low as 
compared to the load torque.