Chapter 3
3-25
System Design and Installation
● Harmonic Current Countermeasures (DC Reactor)
The DC Reactor is used for suppressing harmonic currents. It suppresses sudden and quick
changes in electric currents.
In September 1994, the Ministry of International Trade and Industry established guidelines for the
suppression of harmonic waves emitted from home and general electric appliances. To comply with
the guidelines, appropriate measures are required to suppress the influence of harmonic waves on
power supply lines.
Select the proper DC Reactor model according to the Servo Driver that is to be used.
■ Improving Encoder Cable Noise Resistance
In order to improve the encoder’s noise resistance, take the following measures for wiring and instal-
lation.
• Always use the specified Encoder Cables.
• If lines are interrupted in the middle, be sure to connect them with connectors, making sure that the
cable insulation is not peeled off for more than 50 mm. 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 clamp filter models.
• Do not place the Encoder Cable in the same duct as Control Cables for brakes, solenoids, clutches,
and valves.
Servo Driver DC Reactor
Model number Rated current (A) Inductance (mH) Weight (kg)
100 V R7D-APA3L/APA5L/AP01L R88A-PX5063 1.8 10.0 Approx. 0.6
R7D-AP02L R88A-PX5062 3.5 4.7 Approx. 0.9
R7D-AP04L R88A-PX5061 4.8 2.0 Approx. 0.5
200 V R7D-APA3H/APA5H/AP01H R88A-PX5071 0.85 40.0 Approx. 0.5
R7D-AP02H R88A-PX5070 1.65 20.0 Approx. 0.8
R7D-AP04H R88A-PX5069 3.3 10.0 Approx. 1.0
R7D-AP08H R88A-PX5061 4.8 2.0 Approx. 0.5
Maker Name Model
Tokin EMI core ESD-QR-25-1
TDK Clamp filter ZCAT2032-0930
ZCAT3035-1330
ZCAT2035-0930A
DC Reactor Connection Example
DC Reactor
Servo Driver
+ 1
+ 2
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