Inverter Application Precautions; Selection; Installation; Settings - Omron VARISPEED L7 Manual

Inverter Application Precautions

Selection

Observe the following precautions when selecting an Inverter.
Installing Reactors
A large peak current can 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 shifting capacitor. Excessive peak current
can destroy the converter section. To prevent this, install a DC or AC reactor to improve the power supply
power factor.
If a thyristor converter, 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.

Installation

Observe the following precautions when installing an Inverter.
Installation in Enclosures
Install the Inverter in a clean location where it is not subjected to oil mist, dust, and other contaminants, 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 exceed the allowable temperature. Do not install the Inverter
on wood or other combustible materials.
Installation Direction
Mount the Inverter vertically to a wall or other vertical surface.

Settings

Observe the following precautions when making settings for an Inverter.
Upper Limits
10
The maximum output frequency can be set up to 120Hz. Setting the output frequency too high can damage the
machine. So pay attention to the mechanical system and observe required limits for the output frequency.
DC Injection Braking
If the DC Injection Braking Current or the Braking Time are set too high the motor can overheat what can
damage the motor
2
10-
DC or AC reactor
Power supply
required
(kVA)
Inverter capacity (kVA)
DC or AC reactor not
required