Mitsubishi Electric MELSEC-L LD75D, Руководство пользователя

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APPENDICES
A
Appendix
8
ME
LSE
C
E
xplanat
ion
of
Pos
itioning T
e
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s
DIFFERENTIAL OUTPUT TYPE
This is one type of encoder feedback pulse output. When one signal is output with this method, a companion
signal having the reverse polarity is simultaneously output. This method enables high-frequency transfer, and is
resistant to noise, etc., so it is also used in high-speed signal transfer such as inputting and outputting of pulse
trains. In general, the transmission side is called the driver, the reception side is called the receiver, and a
dedicated IC is used.
START COMPLETE
This signal gives an immediate response notifying the user that the LD75 that was started is now in a normal
state and can start positioning.
BIAS SPEED AT START
A large amount of torque is required when the machine starts moving, but the torque may be unstable at speed 0
with stepping motors. Therefore, movement can be smoothly carried out by starting the movement at a given
speed from the beginning. The bias speed at start is the speed set at that start.
STARTING AXIS
One of the LD75 axis system axes (axis 1, axis 2, axis 3, or axis 4) or the reference axis for the interpolation
operation is designated as the starting axis.
COMMAND PULSE Refer to the term "FEED PULSE".
MANUAL PULSE GENERATOR
The handle of this device is manually rotated to generate pulses. This device is used when manually carrying out
accurate positioning.
OUTPUT TERMINAL
This is a pin connector for outputting data from the LD75 to an external source. It is connected to the motor drive
unit. This terminal is used to output the following.
• Feed pulses for both forward run and reverse run
• Deviation counter clear
The terminal Nos. are determined for each axis.
The output No. Yn is not directly related to the program, so it is not used.
CONTROL UNIT This is one type of positioning reference data. The unit to be used is designated as mm, inch, degree, or pulse.
SETTING UNIT
This is one setting item of the positioning reference parameters. The unit to be used is designated as mm, inch,
degree, or pulse.
ABSOLUTE POSITION DETECTION
SYSTEM
In the absolute position detection system, once an OPR is carried out at the system startup, the system stores
the machine position in the memory and retains the current position even when the power is turned OFF.
Mechanical deviation will be compensated, so that the OPR is not required after the power is turned ON next
time. Configuring this system requires a motor with an absolute position detector and a servo amplifier and
positioning module compatible with an absolute position detection system.
Term Description
Full speed
Speed 0
Bias speed
Made by Mitsubishi Electric Corp.
(model: MR-HDP01)