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4-2 Wiring
4-2-5 Conforming to EMC Directives
Improving Encoder Cable Noise Resistance
Take the following steps during wiring and installation to improve the encoder’s noise
resistance.
•
Always use the specified Encoder Cables.
•
If cables are joined midway, be sure to connect them with connectors and do not
remove more than 50 mm of the cable insulation. In addition, always use shielded
cable.
•
Do not coil cables. If cables are long and are coiled, mutual induction and inductance
will increase and will cause malfunctions. Always use cables fully extended.
•
When installing noise filters for Encoder Cables, use clamp filters. The following table
shows the recommended ferrite-core clamp filter models.
Maker
Product name
Model number
Specifications
NEC TOKIN
Clamp-type EMI Core
ESD-SR-250
For cable diameter up to 13 mm
ZCAT2032-0930
For cable diameter up to 9 mm
ZCAT3035-1330
For cable diameter up to 13 mm
TDK
Clamp Filters for Cable
ZCAT2035-0930A
For cable diameter up to 9 mm
•
Do not place the Encoder Cable in the same duct as Control Cables for brakes, solenoids,
clutches, and valves.
Improving Control I/O Signal Noise Resistance
Positioning can be affected and I/O signal errors can occur if control I/O is influenced by
noise. Follow the methods outlined below for the power supply and wiring.
•
Use completely separate power supplies for the control power supply (especially 24 V
DC) and the external operation power supply. In particular, do not connect the two
power supply ground wires. Install a noise filter on the primary side of the control power
supply.
•
If Servomotors with brakes are being used, do not use the same 24-VDC power supply
for both the brakes and the control I/O. Additionally, do not connect the ground wires.
Connecting the ground wires may cause I/O signal errors.
•
Keep the power supply for pulse commands and deviation counter reset input lines
separated from the control power supply as far as possible. In particular, do not
connect the two power supply ground lines.
•
We recommend using line drivers for the pulse command and deviation counter reset
outputs.
•
Always use twisted-pair shielded cable for the pulse command and deviation counter
reset signal lines, and connect both ends of the shield to frame grounds.
•
If the control power supply wiring is long, noise resistance can be improved by adding
1-µF laminated ceramic capacitors between the control power supply and ground at the
Servo Driver input section or the controller output section.
•
For open-collector specifications, keep the length of wires to within two meters.
4-19
Summary of Contents for SMARTSTEP Junior R7D-ZP
Page 3: ...2 ...
Page 18: ...Section 1 Configuration Features and System ...
Page 25: ...1 5 Applicable Standards 1 5 2 UL and cUL Standards 1 8 ...
Page 26: ...Section 2 Dimensions Standard Models and ...
Page 36: ...Section 3 Specifications ...
Page 62: ...Section 4 System Design ...
Page 86: ...Section 5 Operation ...
Page 96: ...Section 6 Troubleshooting ...
Page 109: ...6 5 Periodic Maintenance 6 5 3 Replacing the Cooling Fan 6 14 ...
Page 110: ...Appendix ...