Fuji Electric ALPHA7, User Manual

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CHAPTER 15 STANDARDS COMPLIANCE
15-12
Complying with "Guideline for Suppressing Harmonics by Customers Receiving High Voltage
or Special High Voltage"
15
(3) Rated input current (receiving voltage conversion value) calculation
Rated input current (receiving voltage conversion value) is calculated with the following equation.
3
H
l H
10
  
V
V
I I
i
I
H
: Rated input current (receiving voltage conversion value) (mA)
I
l
: Fundamental harmonic input current (A)
V
i
: Power supply voltage (V)
V
H
: Receiving voltage (V)
(4) Servo amplifier operation rate
Servomotors are run based on the operation pattern in Fig.15.4-1, and therefore servo amplifier
operation rate A is calculated with the following equation.
M o
c
c c a
a
1 1
60
2
2 P T
N
T
T
A
 








   

 
A : Operation rate
T
o
: Time for 1 servomotor cycle when performing repeat operation (s)
T
a
: Servomotor acceleration time (not necessary to consider
deceleration time) (s)
T
c
: Running time when servomotor running at steady rotation speed (s)
τ
a
: Servomotor acceleration torque (not necessary to consider
deceleration torque) (N·m)
τ
c
: Servomotor load torque (N·m)
N
c
: Servomotor steady rotation speed (min
-1
)
P
M
: Servomotor rated capacity (W)
Fig.15.4-1 Servomotor operation pattern
15.4.2.2 Harmonic Current Calculation
(1) Harmonic current calculation
Rotation speed
Torque
(steady rotation speed)
(torque)
Time