Mitsubishi Electric MELSERVO-J5 User Manual page 309
Ac servo system
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Also See for MELSERVO-J5:
- User manual (580 pages) ,
- Sample screen manual (128 pages) ,
- Introduction manual (112 pages)
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■During forced stop release
• When power is switched on in a forced stop status
Even if forced stop is canceled during absolute position data transfer, there is no problem with the transfer. If forced stop is
canceled during the absolute position data transfer, the base circuit turns on 200 ms to 450 ms after the cancellation. If ABSM
is off, RD is turned on 5 ms after the base circuit turns on. If ABSM is on, RES is turned on after ABSM is turned off. ABS
transfer can be done even after forced stop cancellation.
The current position in the servo amplifier is updated even during a forced stop. As shown in the following diagram, when
SON or ABSM is turned on at forced stop, at the timing of when ABSM switches from off to on, the servo amplifier
simultaneously send the latched current position to the controller side, and the servo amplifier sets this data as the position
command value. However, since the base circuit is off during a forced stop, the status does not switch to servo-lock.
Therefore, if the servo motor is rotated by external force or the like after ABSM is turned on, this travel distance is
accumulated in the servo amplifier as droop pulses. If the forced stop is canceled at this status, the base circuit turns on and
returns to the original position rapidly to compensate for the droop pulses. To avoid this status, read the absolute position data
again before canceling the forced stop.
ON
Power supply
OFF
SON (Servo-on)
EM2 (Forced stop 2)
ABSM (ABS transfer mode)
ABSR (ABS request)
ABST (ABS transmission data ready)
ABSB0 (ABS transmission data bit 0)
ABSB1 (ABS transmission data bit 1)
Base circuit
RD (Ready)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Released
During ABS transfer
Absolute position
data
7 ABSOLUTE POSITION DETECTION SYSTEM
7.3 Absolute position detection system by DIO [A]
200 to 450 ms
5 ms
Operation possible
307
7
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