YASKAWA NX100 - Page 215

8.3 Alarm Message List
8-111
4855 OVERLOAD
(MOMENT)
(SERVO2)
--- The motor is overloaded.
The motor torque has significantly
exceeded the rated torque.
• Turn the power OFF and back ON.
• Check the settings for manipulator motion
condition (influence by external force, load
condition).
• Check the connections of a motor power
line and an encoder line.
• Replace the SERVOPACK.
4856 OVERLOAD
(CONTINUE)
(SERVO2)
--- The motor has continued to be
overloaded for a certain time.
The motor has exceeded the rated
torque for a long period of time.
*In the case of a large capacity
amplifier (The servo pack in use
when the alarm is emitted is
SGDM-
AC-NX1.)
The temperature of SERVOPACK
heatsink has exceeded 100°C.
Frequent ON/OFF switching of the
servo was detected.
Because there is a capacitor in the
power supply section of the large
capacity amplifier, a large charging
current flows when the servo is
switched ON. Consequently, if the
servo is switched ON/OFF fre-
quently, the main circuit devices in
the servo pack will deteriorate.
• Turn the power OFF and back ON.
• Check the settings for manipulator motion
condition (influence by external force, load
condition).
• Check the connections of a motor power
line and an encoder line.
• Replace the SERVOPACK.
*In the case of a large capacity amplifier
(The servo pack in use when the alarm is
emitted is SGDM-
AC-NX1.)
• Turn the power OFF and back ON.
• Set the servo ON/OFF switching frequency
to no more than 5 switching operations per
minute.
• Check the settings for manipulator motion
condition (influence by external force, load
condition).
• Review the ambient operating temperature.
• Replace the SERVOPACK.
4857 DB OVERLOAD
(SEVO2)
--- Energy exceeds the capacity of
dynamic brake (DB) resistor when it
stops.
• Turn the power OFF and back ON.
• Check the settings for manipulator motion
condition (influence by external force, load
condition).
• Replace the SERVOPACK.
4858 RESIST OVER-
LOAD (SERVO2)
--- The main circuit could have been
repeatedly turned on and off.
• Turn the power OFF and back ON.
• Reduce the frequency of the main circuit
power supply ON/OFF.
• Replace the SERVOPACK.
4859 HEAT SINK
OVERHEAT
(SERVO2)
--- The temperature of SERVOPACK
heatsink has exceeded 100°C.
• Turn the power OFF and back ON.
• Check the settings for manipulator motion
condition (influence by external force, load
condition).
• Replace the SERVOPACK.
4860 ENCODER BAT-
TERY ERROR
(SERVO2)
--- The voltage drop of encoder
backup battery is suspected.
• Turn the power OFF and back ON.
• Check the connection of encoder backup
battery and the voltage.
• Replace the MOTOR and SERVOPACK.
4861 ENCODER
OVERHEAT
(SERVO2)
--- The temperature in the encoder is
abnormal.
• Turn the power OFF and back ON.
• Check the settings for manipulator motion
condition (influence by external force, load
condition).
• Replace the MOTOR and SERVOPACK.
4862 SPEED A/D
ERROR
(SERVO2)
--- The A/D converter for the speed
command input or converted data is
incorrect.
• Turn the power OFF and back ON.
• Replace the SERVOPACK.
4863 TORQUE A/D
ERROR
(SERVO2)
--- The A/D converter for the torque
command input is incorrect.
• Turn the power OFF and back ON.
• Replace the SERVOPACK.
4864 WRONG MOTOR
ROTATION
(SERVO2)
--- The detected direction of torque is
opposite to that of speed.
• Turn the power OFF and back ON.
• Check the connections of a motor power
line and an encoder line.
• Replace the MOTOR and SERVOPACK.
Alarm Message List
Alarm
Number
Message
Sub
Code
Cause Remedy