Thanks for your guys reply.
Unfortunately I purchased this robot arm without controller already.
There are two types of servo motors inside: J1,J2,J3 are SGMAH-A3A1A-YR11, J4,J5,J6 are SGMAH-A8A1A-YR11.
And someone post <
>, which means SGDV servo driver can drive SIGMA II servo motor.
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I understood that brake issue, 24V brake maybe can solved easily. 90VDC brake is problem.
Also there are no reply from yaskawa yet~~~