Appendix
12.1.1 Selection
12 - 2
12.1 Inverter Application Precautions
12.1.1 Selection
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Installing Reactors
A large peak current will flow in the power input circuit when the Inverter is connected to a large-capacity
power transformer (600 kVA or higher) or when switching a phase capacitor. Excessive peak current can de-
stroytheconvertorsection. Topreventthis, installaDCor ACreactor(optional) toimprovethepower supply
power factor.
DC reactors are built into 200 V class Inverters of 18.5 to 75 kW and 400 V class Inverters of 18.5 to 160 kW.
If a thyrister convertor, such as a DC drive, is connected in the same power supply system, connect a DC or
AC reactor regardless of the power supply conditions shown in the following diagram.
Inverter capacity (kVA)
DC or AC reactor
Power
supply
capacity
(kVA)
4000
600
0
60
400
Required
Not required
DC or AC reactor
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Inverter Capacity
When connecting special motors or multiple motors in parallel to an Inverter, select the Inverter capacity so
that the rated output current of the Inverter is 1.1 times the sum of all the motor rated currents.
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Initial Torque
The startup and acceleration characteristics of the motor are restricted by the overload current ratings of the
Inverterthatisdrivingthe motor.The torque characteristics are generally lessthanthoserequired when start-
ing using a normal commercial power supply. If a large initial torque is required, select an Inverter with a
somewhat larger capacity or increase the capacity of both the motor and the inverter.
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Emergency Stop
Although the Inverter’s protective functions will stop operation when a fault occurs, the motor will not stop
immediately.Alwaysprovidemechanicalstop and protection mechanismsonequipmentrequiringan emer-
gency stop.
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Options
Terminals B1, B2, ©, ¨1, ¨2, ¨ 3 are for connecting only the options specifically provided by Yaskawa.
Never connect any other devices to these terminals.
12.1.2 Installation
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Installation in Enclosures
EitherinstalltheInverterinacleanlocation notsubjectto oilmist,air-bournematter, dust,andother contami-
nants, or install the Inverter in a completely enclosed panel. Provide cooling measures and sufficient panel
space so that the temperature surrounding the Inverter does not go beyond the allowable temperature. Do not
install the Inverter on wood or other combustible materials.
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Installation Direction
Mount the Inverter vertically to a wall or other horizontal surface.
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