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4
PROCEDURES AND SETTINGS BEFORE
OPERATION
4.4 Wiring
4.4.1 Wiring precautions
4 - 5
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
PROCEDURES AND
SETTINGS BEFORE
OPERATION
5
FUNCTIONS
6
UTILITY PACKAGE (GX
Configurator-CT)
7
PROGRAMMING
8
TROUBLESHOOTING
4.4 Wiring
This section describes wiring an encoder and controller to the QD64D2.
4.4.1 Wiring precautions
One of the conditions to maximize the QD64D2 functions and make the system high-
reliable, the external wiring has to be laid so that the QD64D2 becomes less subject to
noise.
This section describes the precautions on external wiring.
(1) Inputting a signal of different voltage may result in a malfunction or
mechanical failure.
(2) For 1-phase input, always perform pulse input wiring on the phase A
side.
(3) When pulse status noise is input, the QD64D2 may miscount.
(4) Take the following measures against noise for high-speed pulse input.
(a) Always use a shielded twisted pair cable and ground it on the QD64D2 side.
(b) Wire the shielded twisted pair cables so as not to be in parallel with wires causing
much noise such as power lines or I/O wires while keeping a distance of at least
150 mm (5.91 inch) between such wires. Also install the shielded twisted pair
cables as short as possible.
(5) The following diagram shows an example of wiring for measures against
noise.
Figure 4.3 Example of wiring for measures against noise
Terminal
block
Programmable
controller
AC
motor
Relay box
QD64D2
Cart
Encoder
Inverter
Terminal
block
Make the distance between the encoder and relay box as
short as possible.
If the distance is long, a voltage drop may occur. Therefore,
check that the voltages while the encoder is in
operation/stop are within the rated voltage at the terminal
block of the relay box using the measure such as a
synchronoscope.
Install I/O wires at least
150 mm (5.91 inch)
away from the high
voltage equipment such
as relay and inverter.
(Apply this wiring in a
control panel as well.)
Avoid using a solenoid valve and inductive load together in the same
metallic pipe. If a sufficient distance cannot be secured with high voltage
cable due to such as duct wiring, use CVVS or other shielded cable for the
high voltage cable.
Ground the shielded twisted pair cable on the QD64D2 side, and install
the cable as short as possible.