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Step-by-Step Basic Installation Section 2-3
!WARNING In the cases below involving a general-purpose inverter, a large peak current
can flow on the power supply side, sometimes destroying the converter mod-
ule:
1. The unbalance factor of the power supply is 3% or higher.
2. The power supply capacity is at least 10 times greater than the inverter
capacity (or the power supply capacity is 500k VA or more).
3. Abrupt power supply changes are expected, due to conditions such as:
a. Several inverters are interconnected with a short bus.
b. A thyristor converter and an inverter are interconnected with a short
bus.
c. An installed phase advance capacitor opens and closes.
Where these conditions exist or when the connected equipment must be
highly reliable, you MUST install an input-side AC reactor of 3% (at a voltage
drop at rated current) with respect to the supply voltage on the power supply
side. Also, where the effects of an indirect lightning strike are possible, install
a lightning conductor.
2-3 Step-by-Step Basic Installation
This section will guide you through the following basic steps of installation:
Note If the installation is in an EU country, study the EMC installation guidelines in
Appendix D CE-EMC Installation Guidelines.
Choosing a Mounting Location
Study the following caution messages associated with mounting the inverter.
This is the time when mistakes are most likely to occur that will result in
expensive rework, equipment damage, or personal injury.
!WARNING Hazard of electrical shock. Never touch the naked PCB (printed circuit board)
or bus bars while the unit is powered up. Even for switch portion, the inverter
must be powered OFF before you change.
!Caution Be sure to install the unit on flame-resistant material such as steel plate. Oth-
erwise, there is the danger of fire.
!Caution Be sure not to place any flammable materials near the inverter. Otherwise,
there is the danger of fire.
Step Activity Page
1 Choose a mounting location in compliance with the Warnings
and Cautions. See notes below.
page 27
2 Check the mounting location for adequate ventilation page 29
3 Cover the inverter's ventilation openings to prevent debris from
entering.
page 36
4 Check the inverter dimensions for footprint and mounting hole
locations.
page 30
5 Study the Cautions, Warnings, wire and fuse sizes, and termi-
nal torque specifications before wiring the inverter.
page 36
6 Connect wiring for the inverter power input. page 38
7 Wire the inverter output to the motor. page 43
8 Uncover the inverter's ventilation openings applied in Step 3. page 44
9 Perform the Powerup Test. (This step includes several sub
steps.)
page 45
10 Make observations and check your installation. page 57
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