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Tel: (86)755-26434369
10
Website: www.leadshine.com
fluctuation and back EMF voltage generated by motor coils during motor shaft
deceleration. The rated voltage of the motor is an important parameter when
selecting supply voltage. Generally speaking, do not use a power supply voltage
more than 5 volts of the rated voltage of the motor. Higher voltage may cause bigger
motor vibration at lower speed, and it may also cause over-voltage protection or
even driver damage.
Prepare Controller
Prepare a controller with pulse and direction signals. However, the DCS303 has a
built-in motion controller for self-test and Servo Tuning. The built-in motion
controller can generate control signal with trapezoidal velocity profile.
System Connections and Noise Prevention
After finishing the above steps, you can connect your servo system. Before you start,
make sure that the power is off. Connect your system according to connection
diagrams before, and pay attention to the following tips when wiring.
Wire Gauge
The smaller wire diameter (lower gauge), the higher impedance. Higher impedance
wire will broadcast more noise than lower impedance wire. Therefore, when
selecting the wire gauge, it is preferable to select lower gauge (i.e. larger diameter)
wire. This recommendation becomes more critical as the cable length increases. Use
the following table to select the appropriate wire size to use in your application.
Current (A)
Minimum wire size (AWG)
10
#20
15
#18
20
#16
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Tel: (86)755-26434369
11
Website: www.leadshine.com
Cable Routing
All content sensitive signal wires should be routed as far away from motor power
wires and driver power wires as possible. Motor power and driver power wires are
major sources of noise and can easily corrupt a nearby signal. This issue becomes
increasingly important with longer motor power and driver power wires lengths.
Twisted Wires
Twisted wires effectively increasing noise immunity. The successive twists eliminate
noise transients along the length of the cable. Both signal cables and power cables
should be of the twisted and shielded type. Differential signal wires should be
twisted as a pair. The combination of twisted pair wires and a differential signal
significantly adds to noise immunity. Power wires should be twisted as a group
along with the ground (or chassis) wire, if available.
Cable Shielding
All signal wires should be bundled and shielded separately from driver power and
motor power wires. Power wires should also be bundled and shielded. When
grounding a shield, the rule-of-thumb is to do so at the
‘
source
’
of power while
leaving the other shield end open. For example, in the case of motor power wires,
this would be the drive side. Ideally, twisted pairs should be individually shielded
and isolated from the outer shield, which encompasses all wires within the cable.
However, since this type of stringent shielding practice is often not required, typical
cables do not provide isolation between inner and outer shields.
System Grounding
Good grounding practices help reduce the majority of noise present in a system. All
common grounds within an isolated system should be tied to PE (protective earth)
through a
‘
SINGLE
’
low resistance point. Avoiding repetitive links to PE creating