Connecting An Ac Or Dc Reactor; Connecting A Surge Absorber - YASKAWA V1000 Technical Manual

NOTICE: Do not connect electromagnetic switches or MCs to the output motor circuits without proper sequencing. Improper sequencing
of output motor circuits may cause damage to the drive.
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 MC more than once every 30 minutes.
Frequent use can damage the drive. Use the drive to stop and start the motor.
Note: 1. Install an MC to the drive output to prevent the drive from restarting automatically when the power is restored after momentary
power loss.
2. Set up a delay for the MC so that it does not open prematurely for the drive to continue operating through momentary power loss.
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
A – Power supply
B – MCCB
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.
example of DC reactor wiring.
A – Power supply
B – MCCB
u

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.
Note: Never connect a surge absorber to the drive output.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
C
A B
U
V
W
C – AC reactor
D – Drive
Figure 8.3 Connecting an AC Reactor
Refer to Connecting a DC Reactor on page 309
A B
R/L1
S/L2
T/L3
C – Drive
D – DC reactor
Figure 8.4 Connecting a DC Reactor
8.4 Installing Peripheral Devices
D
X R/L1
Y S/L2
Z T/L3
C
+1 +2
D
for an
8
309