LSIS XDL-L7NH Series, User Manual, Page: 303 / 348

11. Maintenance and Inspection
11-43
11.
Maintenance and Inspection
11.1
Maintenance and Inspection
This chapter explains how to perform basic maintenance and inspection tasks as well as diagnose and
troubleshoot the servo motor and drive.
11.1.1
Precautions
1. Measuring the motor voltage: The PWM controls the voltage output from the servo amp to the motor.
Because of this, the waves take the form of pulses. Use a rectifier voltmeter for accurate
measurements because different meters may produce different results.
2. Measuring the motor current: Use a moving iron ammeter and wait for the motor's reactance to
smooth the pulse waveform into sine waves.
3. Measuring the electric power: Use an electrodynamometer based on the 3 power meter method.
4. Other gauges: When using an oscilloscope or digital voltmeter, do not allow them to touch the
ground. Use a 1 mA or less input current gauge.
11.1.2
What to Inspect
Wait at least 10 minutes after turning off the power before beginning the inspection because the
condenser can hold enough voltage to cause an electrical accident.
(1)
Inspecting the Servo Motor
Caution
Wait at least 10 minutes after turning off the power before beginning the inspection because the
condenser can hold enough voltage to cause an electrical accident.
Inspection
Item
Inspection Period Inspection and Handling Notes
Vibration and
sound check
Monthly
Touch the motor and listen for
sounds. The feel and sounds should be
the same as usual.
Inspect the
exterior of the
motor
Depends on the
amount of
contamination or
damage.
Clean the motor with a cloth or air
pressure.
-
Measure the
insulation
resistance
At least once a year
Disconnect the motor from the
drive and measure the insulation
resistance.
A normal resistance level is 10
㏁
or higher.
Note 1)
Contact our service center if the
resistance is lower than 10
㏁ .
Replace the oil
seal
At least once
every 5,000 hours
Remove the oil seal from the
motor and replace it. This only applies to motors with
an oil seal.
General
inspection
At least once every
20,000 hours or after
5 years.
Contact our service center.
Do not disassemble the servo
motor yourself.
Note 6) Measure the resistance between the FG and one of the U, V, and W power lines on the servo motor.