Protecting The Braking Resistor Or Braking Resistor Unit; Connecting An Ac Or Dc Reactor; Connecting An Ac Reactor - YASKAWA V1000 Series Installation & Start-Up Manual

7.4 Installing Peripheral Devices
switching the MC more than once every 30 minutes. Frequent use can damage the drive. Use the drive to
stop and start the motor.

Protecting the Braking Resistor or Braking Resistor Unit

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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. When using a braking unit, use a thermal relay on the braking resistors and
configure a fault contact output for the braking resistor unit to disconnect drive main power via an input
contactor. Inadequate braking circuit protection could result in death or serious injury by fire from
overheating resistors.
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Connecting an AC or DC Reactor

AC and DC reactors suppress surges in current and improve the power factor on the input
side of the drive.
To better suppress harmonic current, use an AC reactor and DC reactor together.
Use a DC reactor or AC reactor or both:
• To suppress harmonic current or improve the power factor of the power supply.
• When using an advancing capacitor switch.
• With a large capacity power supply transformer (over 600 kVA).
Note: Use an AC or DC reactor when also connecting a thyristor converter (such as a DC drive) to the
same power supply system, regardless of the conditions of the power supply.

Connecting an AC Reactor

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Figure 7.4
A – Power supply
B – MCCB
272
A B
Figure 7.4 Connecting an AC Reactor
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
C
U X R/L1
V Y S/L2
W Z T/L3
C – AC reactor
D – Drive
D