Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

Page: 134 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 127
Description Possible cause Check result Action Target
For a servo motor with an
electromagnetic brake, the
brake went out. The electromagnetic brake is
failure due to its life. For the
life of electromagnetic brake,
refer to "Servo Motor
Instruction Manual (Vol. 3)". Remove the servo motor and
all wirings from the machine
and check if the servo motor
shaft can be rotated by
hands.
(If it is rotated by hands, the
brake is failure.) Replace the servo motor. [A]
[B]
[WB]
[RJ010]
[GF]
The coasting distance of the
servo motor became longer. The load was increased and
permissible load to motor
inertia ratio was exceeded. Check if the load was
increased. Reduce the load.
An external relay is
malfunctioning. Or the wiring
of MBR (Electromagnetic
brake interlock) is incorrect. Check the external relay and
wirings connected to MBR
(Electromagnetic brake
interlock) if they are
malfunctioning. Replace the external relay.
Or review the wiring.
The electromagnetic brake is
failure due to its life. For the
life of electromagnetic brake,
refer to "Servo Motor
Instruction Manual (Vol. 3)". Remove the servo motor and
all wirings from the machine
and check if the servo motor
shaft can be rotated by
hands.
(If it is rotated by hands, the
brake is failure.) Replace the servo motor.
The program operation is not
in progress. The command speed of the
positioning operation is low. An abnormal value such as 0
[r/min] was set for specifying
the servo motor speed. Review the program. [A]
The program stops at the
state of waiting for external
signal on. A program input number set
with SYNC command does
not match with the actual
inputted signal. Review the program or signal
to use.
A point table was executed
but the operation did not start. A positioning to the same
position is repeated. Multiple operation starts
which have the same
specified number of point
table are in progress. Review the setting of the
point table or procedures of
the operation. [A]
[GF]
Positioning to a same point
was endlessly repeated with
automatic continuous
operation "8, 9, 10, 11" was
selected in sub functions of
the point table operation. Review the setting of the
point table or procedures of
the operation.
The electromagnetic brake
cannot be canceled. The wiring is incorrect. Check the SBC output signal. Review the output signals. [B]
A signal of output device is
not outputted correctly. Check if the output device
cable is wired correctly. Or
check if a load of output
device is over specifications. Review the wiring or load.
The functional safety unit is
malfunctioning. Replace the functional safety
unit, and then check the
repeatability. Replace the functional safety
unit.
A vertical axis falls while the
SBC output is used. The STO function is used
during servo-on. Check if the SS1 function is
enabled. Enable the SS1 function.
A signal of output device is
not outputted correctly. Check if the output device
cable is wired correctly. Or
check if a load of output
device is over specifications. Review the wiring or load.
The functional safety unit is
malfunctioning. Replace the functional safety
unit, and then check the
repeatability. Replace the functional safety
unit.
The setting of a waiting time
of the electromagnetic brake
sequence output is incorrect. Check if [Pr. PC02
Electromagnetic brake
sequence output] and [Pr.
PSA03 SS1 monitoring
deceleration time] are set
correctly. Set it correctly.