Mitsubishi Electric MR-JE-_A, Instruction Manual

Page: 118 / 370

4. STARTUP
4 - 17
4.4.6 Trouble at start-up
CAUTION
Never make a drastic adjustment or change to the parameter values as doing so
will make the motion unstable.
POINT
Using the optional MR Configurator2, you can refer to reason for rotation failure,
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 7-segment LED is
not lit.
7-segment LED
blinks.
Not improved even if CN1 and
CN2 connectors are
disconnected. 1. Power supply voltage fault
2. The servo amplifier is
malfunctioning.
Improved when CN1 connector is
disconnected. Power supply of CN1 cabling is
shorted.
Improved when CN2 connector is
disconnected. 1. Power supply of encoder
cabling is shorted.
2. Encoder is malfunctioning.
Alarm occurs. Refer to chapter 8 and remove cause. Chapter 8
2
Switch on SON
(Servo-on). Alarm occurs. Refer to chapter 8 and remove cause. Chapter 8
Servo motor shaft is
free. Call the external I/O signal
display (section 4.5.7) and check
the on/off status of the input
signal. 1. SON (Servo-on) is not input.
(wiring mistake)
2. 24 V DC power is not supplied
to DICOM.
Section
4.5.7
3
Switch on RS1
(Forward rotation
start) or RS2
(Reverse rotation
start). Servo motor does not
rotate. Call the status display (section
4.5.3) and check the input
voltage of TC (Analog torque
command). Analog torque command is 0 V. Section
4.5.3
Call the external I/O signal
display (section 4.5.7) and check
the on/off status of the input
signal. RS1 and RS2 are off. Section
4.5.7
Check the internal speed limit 1
to 7 ([Pr. PC05] to [Pr. PC11]). Set value is 0. Section
5.2.3
Check the analog torque
command maximum output ([Pr.
PC13]) value. Torque command level is too low
as compared to the load torque. Section
5.2.3
Check the forward rotation
torque limit ([Pr. PA11]) and the
reverse rotation torque limit ([Pr.
PA12]). Set value is 0. Section
5.2.1