Connecting An Ac Reactor Or A Dc Link Choke - YASKAWA L1000A Technical Manual

NOTICE: Install an MC on the input side of the drive when the drive should not automatically restart after power loss. To get the full
performance life out of the electrolytic capacitors and circuit relays, refrain from switching the drive power supply off and on more than
once every 30 minutes. Frequent use can damage the drive. Use the drive to stop and start the motor.
NOTICE: Use a magnetic contactor (MC) to ensure that power to the drive can be completely shut off when necessary. The MC should
be wired so that it opens when a fault output terminal is triggered.
Note: 1. Install an MC to the drive input side to prevent the drive from restarting automatically when power is restored after momentary power
loss.
2. Set up a delay that prevents the MC from opening prematurely to continue operating the drive through a momentary power loss.
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Protecting the Braking Resistor or Braking Resistor Unit
Use an MC on the input side of the drive to protect a braking resistor or braking resistor unit from overheat or fire.
WARNING! Fire Hazard. Applications using a braking option should wire a thermal relay so that the output contactor opens when the
thermal relay trips. Inadequate braking circuit protection could result in death or serious injury by fire from overheating resistors.
WARNING! Fire Hazard. Confirm an actual motor overload condition is not present prior to increasing the thermal oL trip detection
setting. Check local electrical codes before making adjustments to motor thermal overload settings. Failure to comply can result in
death or serious injury by fire.

◆ Connecting an AC Reactor or a DC Link Choke

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Placement
When connecting to a power supply transformer with greater than 600 kVA capacity, or when switching a phase advance
capacitor, large peak current can flow through the input power supply circuit and damage converter components in the
drive.
As a preventive measure, install an AC reactor or a DC link choke to the input side of the drive. Installing an AC reactor
or a DC link choke will also help improve the power factor.
Install an AC reactor or a DC link choke if a DC drive or another type of thyristor converter is running from the same
power system, regardless of the power supply conditions shown in
Note: A DC link choke built in to the drive models 2A0085 to 2A0415 and 4A0045 to 4A0260.
Figure 8.9
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Connecting an AC Reactor
Figure 8.10
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
4000
Power supply harmonics
AC reactor or DC link choke
Power Supply
required
Capacity (kVA)
600
0
Figure 8.9 Installing an AC Reactor or DC Link Choke
A B
A – Power supply
B – MCCB
Figure 8.10 Connecting an AC Reactor
Figure 8.9.
AC reactor or DC link
choke unnecessary
60 400
Drive Capacity (kVA)
C D
U X R/L1
V Y S/L2
W Z T/L3
C – AC reactor
D – Drive
8.5 Installing Peripheral Devices
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nly
Common_
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