69
CHAPTER 6 INSTALLATION AND WIRING
6
6.6 Wiring of Con
nector
s for External Devices
6.6.1 Wiring pr
ecautions
(4) Measures against noise
• The high-speed counter module may incorrectly count the pulses when pulse-state noises are input.
• When inputting high-speed pulses, take the following measures against noise.
• The following figure shows an example of a noise reduction measure.
• Ground the shielded twisted pair cable on the encoder side (relay box). (Wiring example: with a sink type
encoder (24V))
Measure 1
Measure 2
Use shielded twisted pair cables, and ground them on the encoder side with a ground
resistance of 100 or less.
Use the shortest possible shielded twisted pair cables, placing them not parallel with
noise-generating power cables or I/O cables and at a distance of 150mm or more.
Install a cable at least
150mm away from
the I/O cable of a high
voltage equipment such
as a relay or inverter.
(Pay attention to wiring
in the control panel as
well.)
AC
motor
Relay box
Cart
Avoid using a solenoid valve or inductive load together with the cable in a metallic pipe.
If a sufficient distance from the power line cannot be ensured due to duct wiring,
use shielded cables such as CVVS for the power line.
Encoder
Inverter
Terminal
block
High-speed counter module
Ground shielded twisted pair cables on the encoder side.
Use the shortest possible shielded cables.
Keep a shortest distance between the encoder and relay box.
If the distance from the high-speed counter module to the encoder is long,
a voltage drop may occur. Using a measuring instrument such as
a synchroscope on the terminal block of the relay box, check that the voltages
in the encoder operation and stop status are within the rated voltage range.
If a voltage drop is too large, increase the cable size or use a 24VDC
encoder that will consume less current.
Terminal
block
High-speed
counter module
To A
To B
To the high-speed
counter module
Current for encoder
A
B
24V
E
+24V
0V
E
To the encoder
Connect the shielded cable of the encoder to the shielded cable
of the shielded twisted pair cable in the relay box. If the shielded
cable of the encoder is not grounded in the encoder, ground it to
the relay box as shown by the dotted lines.
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