Technical information

93
MITSUBISHI ELECTRIC
SERVO AND MOTION SYSTEMS
SERVO AND MOTION SYSTEMS ///
X-Y Table System Configurations
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 p rovides two exam
-
ples of possible X-Y table system configurations,
using M itsubishi automation equipment.
The first is a linear FX2N-10PG based system and
the second is a more complex interpolating
QD75M (SSCNET) based system.
System 1: FX2N-10PG based system
The FX2N-10PG is a single axis position
control module, therefore two modules
are used to control the X and Y axes. The
FX2N-10PG uses a differential pulse train
output to control the position of the
Servo Motors. As a differential pulse train
output is given, then the MR-J2S-A Series
ofServoamplifiersmustbeused(these
allow control from either a pulse train or
analogue source).
One of the disadvantages of using the
FX2N-10PG system is that interpolation
between the two axes is not possible.
This is due to the fact that as the position
modules are independent of each other
they cannot make c ombined moves.
Another disadvantage is that the control
-
ler (FX PLC) does not know the true posi
-
tion of each of the Servo motors. This
may cause problems if a power-down sit-
uation 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: QD75M based system
The QD75M based system uses the pow-
erful modular Qn PLC Series, providing
greater func tionality and expandability
options. The QD75M system is connected
using SSCNET (Servo System Controller
Network), which is Mitsubishi’s dedicated
motion cont rol network. SSCNET simpli-
fies the set-up of the system and reduces
the wiring required. SSCNE T systems are
createdbysimplyplugginganamplifier
into the main controller (QD75M) and
then "daisy- chaining" each additional
axis that is added. SSCNET connectivity
requires MR-J2S-B type amplifiers to be
used.
Furthermore, as the Servo amplifiers are
connected by a bus system, all Ser vo
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 QD75M
module.
Also, all of the internal Servo parameters
canbesetfromthePLC,againduetothe
bus system used.
The bus system also means that position
data is sent serially, therefore reducin g
any possible inter ference due to noise.
Finally, as both a xes are controlled from
one high function module (QD75M2),
interpolation between the two axes is
possible.
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SSCNET 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-J2S-10A Servo Amplifier
HC-KFS13 Motor
MR-J2S-60A Servo Amplifier
HC-SFS52 Motor
Products Function
Q00J Q PLC
QD75-M2 Positioning Controller
MR-J2S-10B Servo Amplifier
HC-KFS13 Motor
MR-J2S-40B Servo Amplifier
HC-SFS52 Motor
MR-BAT Servo Amplifier Battery
MR-BAT Servo Amplifier Battery
X-Y table control
Automation Book_UK_2008.prn
Automation Book_UK_2008
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