Yaskawa AC Drive Z1000 - Manual (Page 253)

u Installing a Magnetic Contactor at the Power Supply Side
Install a magnetic contactor (MC) to the drive input for the purposes explained below.
n Disconnecting the Power Supply
Shut off the drive with an MC when a fault occurs in external equipment.
NOTICE: Do not connect electromagnetic switches or MCs to the output motor circuits without proper sequencing. Improper sequencing of
output motor circuits could result in 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 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.
u Connecting an AC Reactor
AC reactors suppress surges in current and improve the power factor on the input side of the drive.
Use an AC reactor in the following situations:
• 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 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
B A
C D
R/L1 U
V
W
X
Y
Z
S/L2
T/L3
A – Power supply
B – MCCB C – AC reactor
D – Drive
Figure 6.9 Connecting an AC Reactor
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.
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.
6.5 Installing Peripheral Devices
YASKAWA ELECTRIC TOEP C710616 45E YASKAWA AC Drive – Z1000 User Manual 253
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Peripheral Devices & Options