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4-3
4. Troubleshooting
CAST-AU4/B2521E
4-1-2 External Noise
External electrical noise is a difficult problem because it is invisible. Take the following remedial measures.
If the symptom disappears, electrical noise was probably the cause of the trouble.
(1) Earthing the power supply
Always connect the earth of the AC output to ground (Class 3 ground).
If the earth is not connected, the equipment is susceptible to electrical noise.
(2) Separation of AC connections
Connect the AC power of the machine to a separate AC outlet from any equipment that generates
significant electrical noise.
(3) Cable length
The cables connected to the machine can function as antenna and pick up
electrical wave noise. Make the cable length as short as possible, and use shielded cables where
possible.
The teaching pendant is connected by a long cable to the ROBOKIDS, so disconnect the teaching
pendant when not in use.
4-1-3 Abnormal Sound from Unit’s Motors
The Z unit motor and the ZR unit motor are equipped with brakes; these motors may
occasionally produce abnormal sounds such as scratching or crunching noises. These sounds are caused by
the structure of the brakes and are not a problem.
Also, a squeaking or creaking sound may be heard when the emergency stop switch is pressed during AUTO
operation. These are the stepping out sound that is generated when the Z-axis is forcibly stopped by
stepping it out in order to prevent the Z-axis from moving down during an emergency stop. These sounds
cause no problem in terms of reliability.