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Mitsubishi Electric CNC Specifications And Instruction Manual page 87

Direct drive motor
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Direct Drive Motor Specifications and Instruction Manual
7 Setup
<Confirmation of encoder installation polarity>
(7) Drive the direct-drive motor until the Z-phase has been detected with handle feed (select the minimum pulse
magnification).
->
Switch to the [Servo diagn] menu on the NC maintenance screen, select [Servo unit] and confirm [Control
output 2/bit0(ZCN) *Z-phase passed] is "1".
(8) 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 (4) to (8) again after turning the NC
power ON again.
(9) Turn ON the emergency stop.
(10) Set the parameter (NC system side) for enabling the absolute position control (#2049(type) = the absolute position
zero point alignment method to be used) .
(11) Release the parameters related to the initial magnetic pole estimate function (#2321(SV121) to 0, #2322(SV122) to
0, and #2323(SV123) to 0).
(12) Turn the NC power ON again.
(13) Confirm that the warning during initial setup for the absolute position (A3) is released and [Motor end encoder]
displays "MBA405W".
<DC excitation function>
(14) Set the servo parameter #2213(SV013) to 100.
(15) Set the parameters related to the DC excitation (#2261(SV061) to 10, #2262(SV062) to 10, and #2263(SV063) to
1000).
(16) Set the servo parameter #2234/bit4(SV034/bit4) to "1" to enable the DC excitation mode.
(17) Release the emergency stop.
(18) Confirm that the direct-drive motor carries out a reciprocation operation between about ±10° and 20°once (start DC
excitation).
(19) Confirm that the direct-drive motor stops after the reciprocation operation.
(20) Switch to the [Servo diagn] menu on the NC maintenance screen, select [Servo unit] and monitor [AFLT gain].
(21) Turn ON the emergency stop (terminate DC excitation).
(22) Repeat (17) to (21) 5 times, and monitor the ALFT gain value (magnetic pole shift amount) each time.
If difference of the magnetic pole shift amounts is 1000 data or bigger, reset the related parameter settings
(#2261(SV061)=+10, #2262(SV062)=+10) and perform (17) to (21) again.
(23) Calculate the average of the magnetic pole shift amounts, and set it to #2228(SV028).
(24) Return the servo parameter #2234/bit4(SV034/bit4) back to the original setting, "0".
(25) Turn the NC power ON again.
(26) Return the servo parameter #2213(SV013) back to the original setting after confirming the initial setup.
CAUTION
1. Alarm 37 / error number 2454 is detected before the initial setup operation, but this is not a fault. The alarm will be
cleared after the initial setup is completed and by turning the NC power ON again.
2. The NC monitor displays "MB*405W" before the initial setup is completed. It will be correctly displayed as "MBA405W"
after the initial setup is completed.
IB-1501068-C
62

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