Connecting A Surge Absorber - YASKAWA L1000A Technical Manual

8.5 Installing Peripheral Devices
■ Connecting a DC Link Choke
A DC link choke can be installed to drive models CIMR-LU20008 to 20075, 40005 to 40039, and 50003 to
50027. When installing a DC link choke, remove the jumper between terminals +1 and +2 (terminals are jumpered for
shipment). The jumper must be installed if not using a DC link choke. Refer to
choke wiring.
Figure 8.22

◆ Connecting a Surge Absorber

A surge absorber suppresses surge voltage generated from switching an inductive load near the drive. Inductive loads
include magnetic contactors, relays, valves, solenoids, and brakes. Always use a surge absorber or diode when operating
with an inductive load.
WARNING! Fire Hazard. Due to surge absorber short circuit on drive output terminals U/T1, V/T2, and W/T3, do not connect surge
absorbers to the drive output power terminals. Failure to comply may result in serious injury or death by fire or flying debris.
◆ Connecting a Noise Filter
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.
Figure 8.23
372
A
A – Power supply
B – MCCB
Figure 8.24 Connecting a DC Link Choke
A
A – Power supply
B – Input-side noise filter
(model LNFD-)
Figure 8.25 Input-Side Noise Filter (Three-Phase 200/400 V)
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
C
B
R/L1
S/L2
T/L3
+ 1 +
D
C – Drive
D – DC Link Choke
B
MCCB
R/L1
R U
S/L2
S V
T/L3
T W
E
MCCB
D
C – Drive
D – Other control device
Figure 8.24 for an example of DC link
2
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ly