Fuji Electric ALPHA7, User Manual

Page: 485 / 662

CHAPTER 10 PERIPHERAL EQUIPMENT
10-14
AC/DC Reactor
10
10.7 AC/DC Reactor
Connect an AC or DC reactor in following cases.
(1) Large power supply capacity
With power supply capacities exceeding 500 [kVA], the power-on input current fed to the servo
amplifier may become too large and cause damage to the internal rectifying diode.
(The power supply capacity depends on the 20 [m] wiring length and the designated cable size.)
(2) Imbalance in source voltage
If there is imbalance in the source voltage, the current gathers to the phase of a higher voltage.
Connect the AC reactor if the ratio of voltage imbalance is 3 [%] or above.
(Ratio of power supply imbalance) =
× 100
Insert an AC reactor to balance the input current among phases. The AC reactor also provides
protection against loss of source voltage or similar hazards.
(3) Suppression of harmonics
The servo amplifier generates harmonics currents because it is a capacitor input type. The AC
reactor suppresses current distortion in the power supply system, protecting devices in the
same system against damage. Imbalance in the source voltage increases harmonics currents.
Insert an AC reactor in the primary circuit of the servo amplifier. Heat generation is caused with
types of a small rated conductive current, and the suppression effect is reduced with types of a
large rated conductive current.
Model of AC/DC reactor
 In case of single-phase 200V
Servo amplifier capacity
[kW]
AC reactor DC reactor
0.05
ACR2-0.4A
DCR2-0.2
0.1 DCR2-0.4
0.2 ACR2-0.75A DCR2-0.75
0.4 ACR2-1.5A DCR2-1.5
0.75 ACR2-2.2A DCR2-2.2
(Max. voltage [V]) - (Min. voltage [V])
(Average voltage of three phases [V])