n
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. 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.
u
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.
Use a DC reactor or AC reactor or both:
• To suppress harmonic current or improve the power factor of the power supply.
• When using a phase 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.
n
Connecting an AC Reactor
BA
C D
R/L1U
V
W
X
Y
Z
S/L2
T/L3
A – Power supply
B – MCCB
C – AC reactor
D – Drive
Figure 7.3 Connecting an AC Reactor
n
Connecting a DC Reactor
Ensure the jumper between terminals +1 and +2 (terminals are jumpered for shipment) is
removed when connecting a DC reactor. The jumper must be installed if no DC reactor is
used. Refer to Connecting a DC Reactor on page 194 for an example of DC reactor wiring.
7.4 Installing Peripheral Devices
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
193
7
Peripheral Devices &
Options
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