u
Connecting a Noise Filter
n
Input-Side Noise Filter
Drive outputs generate noise as a result of high-speed switching. This noise flows from inside the drive back to the power
supply, possibly affecting other equipment. Installing a noise filter to the input side of the drive can reduce the amount of noise
flowing back into the power supply. This also prevents noise from entering the drive from the power supply.
• Use a noise filter specifically designed for AC drives.
• Install the noise filter as close as possible to the drive.
C
D
A
B
R/L1
U
V
W
R
S
T
E
MCCB
MCCB
S/L2
T/L3
A – Power supply
B – Input-side noise filter
(model LNFD-
oo
)
C – Drive
D – Other control device
Figure 8.16 Input-Side Noise Filter (Three-Phase 200/400 V)
200 V Class and 400 V Class drive models are tested according to European standards IEC/EN 61800-5-1 and comply with
Refer to EMC Guidelines Compliance on page 544
for details on EMC filter selection and installation.
n
Output-Side Noise Filter
A noise filter on the output side of the drive reduces inductive noise and radiated noise.
output-side noise filter wiring.
NOTICE: Do not connect phase-advancing capacitors or LC/RC noise filters to the output circuits. Improper application of noise filters could
result in damage to the drive.
C
D
B
A
M
R/L1
MCCB
S/L2
T/L3
U/T1
V/T2
W/T3
1
2
3
4
5
6
A – Power supply
B – Drive
C – Output-side noise filter
D – Motor
Figure 8.17 Output-Side Noise Filter
•
Radiated Noise:
Electromagnetic waves radiated from the drive and cables create noise throughout the radio bandwidth
that can affect surrounding devices.
•
Induced Noise:
Noise generated by electromagnetic induction can affect the signal line and may cause the controller to
malfunction.
Preventing Induced Noise
Use a noise filter on the output side or use shielded cables. Lay the cables at least 30 cm away from the signal line to prevent
induced noise.
8.5 Installing Peripheral Devices
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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8
Peripheral Devices & Options
