Patent ID: 7525273

Claim:
A robot control system provided with a processor, a servo amplifier having an AC/DC converter, a resistance for preventing a rush current at the time of charging a smoothing capacitor in said AC/DC converter, a first contact connected in series to said resistance, a first switch circuit opening/closing said first contact by a command from said processor, a first detection circuit detecting an opened/closed state of said first contact and notifying it to said processor, a second contact provided in parallel to said resistance and first contact, a second switch circuit opening/closing said second contact by a command from said processor, and a second detection circuit detecting an opened/closed state of said second contact and notifying it to said processor, said robot control system operating so that when charging said capacitor, it closes said first contact to charge said capacitor, then closes said second contact, wherein said processor commands said first switch circuit and second switch circuit to open/close said first contact and second contact and wherein said first detection circuit and second detection circuit detect if said first contact and second contact open/close as instructed so as to check for abnormalities of said first contact and second contact.