Mitsubishi Electric CNC Specifications And Instruction Manual page 83

Direct Drive Motor Specifications and Instruction Manual
7 Setup
<Confirmation of encoder installation polarity>
(14) Release the emergency stop.
(15) Drive the direct-drive motor about ±20° with handle feed (select the minimum pulse magnification).
(16) Switch to the [Servo diagn] menu on the NC maintenance screen, select [Servo unit] and check [Load current]. Also
check if any alarm is occurring.
-> The encoder installation polarity may be reverse if the current value reaches to the current limit or any alarm
occurs. Set the servo parameter #2217/bit0(SV017/bit0) to "1" and perform (14) to (16) again after turning the
NC power ON again.
(17) Turn ON the emergency stop.
(18) Return the servo parameter #2213(SV013) back to the original setting after confirming the initial setup.
CAUTION
1. Never operate the direct-drive motor before DC excitation function is enabled.
2. The motor carries out a reciprocation operation at about the magnetic pole pitch while DC excitation function is enabled.
3. The magnetic pole shift amount cannot be calculated correctly with incorrect wiring in the motor power line or encoder
cable.
IB-1501068-C 58