Specifications

37
MITSUBISHI ELECTRIC
5
APPLICATIONS
SYSTEM CONFIGURATION ///
An X-Y table is a typical two axes servo applica
-
tion, commonly used in industry for pick and
place systems such as PCB component inser
-
tion machines through to welding machines.
The following information provides two exam
-
ples of possible X-Y table system configura
-
tions, using Mitsubishi automation equip
-
ment.
The first isa linear FX2N-10PG based system
and the second is a more complex interpolat
-
ing QD75M (SSCNET) based system.
System 1: FX2N-10PG based system
The FX2N-10PG is a single axis position
control module, therefore two mod-
ules are used to control the X and Y
axes. The FX2N-10PG uses a differen-
tial pulse train output to control the
position of the Servo Motors. As a dif-
ferential pulse train output is given,
then the MR-J3-A Series of Servo
amplifiers must be used (these allow
control from either a pulse train or
analogue source).
One of the disadvantages of using the
FX2N-10PG system is that interpola-
tion between the two axes is not possi-
ble. This is due to the fact that as the
position modules are independent of
each other they cannot make com-
bined moves.
Another disadvantage is that the con-
troller (FX PLC) does not know the true
position of each of the Servo motors.
This may cause problems if a
power-down situation occurs or an
axis is physically moved.
One major advantage that the
FX2N-10PG systems have is that they
can be easily integrated into existing
FX PLC systems.
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Simple to use
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Widely used
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Cost effective
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Simple functionality
System 2: QD75MH based system
The QD75MH based system uses the
powerful modular Qn PLC Series,
providing greater functionality and
expandability options. The QD75MH
system is connected using SSCNET III
(Servo System Controller Network),
which is Mitsubishi’s dedicated
motion control network. SSCNET III
simplifies the set-up of the system
and reduces the wiring required.
SSCNET III systems are created by
simply plugging an amplifier into the
main controller (QD75MH) and then
"daisy-chaining" each additional axis
that is added. SSCNET III connectivity
requires MR-J3-B type amplifiers to
be used.
Furthermore, as the Servo amplifiers
are connected by a bus system, all
Servo data, such as current position,
torque etc. can all be monitored
back at the main controller
(Q00J PLC) as the data is automatically
updated on the QD75MH module.
Also, all of the internal Servo param-
eters can be set from the PLC, again
due to the bus system used.
The bus system also means that posi-
tion data is sent serially, therefore
reducing any possible interference
due to noise.
Finally, as both axes are controlled
from one high function module
(QD75MH), interpolation between
the two axes is possible.
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SSCNET III capability
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Easy of set-up
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High functionality
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Expandability
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Module Options
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Reduced Wiring
Products Function
FX2N-16MR-ES/UL PLC
FX2N-10PG Pulse train output module
FX2N-10PG Pulse train output module
MR-J3-10A Servo Amplifier
HF-KP13 Motor
MR-J3-60A Servo Amplifier
HF-SP52 Motor
Products Function
Q00J Q PLC
QD75-MH2 Positioning Controller
MR-J3-10B Servo Amplifier
HF-KP13 Motor
MR-J3-40B Servo Amplifier
HF-SP52 Motor
MR-BAT Servo Amplifier Battery
X-Y table control
왎
X-Y Table System Configurations