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Introduction to Variable-Frequency Drives Section 1-3
The Omron inverter is a rugged and reliable device. The intention is for the
inverter to assume the role of controlling power to the motor during all normal
operations. Therefore, this manual instructs you not to switch off power to the
inverter while the motor is running (unless it is an emergency stop). Also, do
not install or use disconnect switches in the wiring from the inverter to the
motor (except thermal disconnect). Of course, safety-related devices such as
fuses must be in the design to break power during a malfunction, as required
by NEC and local codes.
1-3-6 Intelligent Functions and Parameters
Much of this manual is devoted to describing how to use inverter functions
and how to configure inverter parameters. The inverter is micro-processor-
controlled, and has many independent functions. The microprocessor has an
on-board EEPROM for parameter storage. The inverter's front panel keypad
provides access to all functions and parameters, which you can access
through other devices as well. The general name for all these devices is the
digital operator, integrated operator, or digital operator panel. Chapter 2 will
show you how to get a motor running, using a minimal set of function com-
mands or configuring parameters.
The optional read/write programmer will let you read and write inverter
EEPROM contents from the programmer. This feature is particularly useful for
OEMs who need to duplicate a particular inverter's settings in many other
inverters in assembly-line fashion.
1-3-7 Braking
In general, braking is a force that attempts to slow or stop motor rotation. So it
is associated with motor deceleration, but may also occur even when the load
attempts to drive the motor faster than the desired speed (overhauling). If you
need the motor and load to decelerate quicker than their natural deceleration
during coasting, we recommend installing a braking resistor. The dynamic
braking unit (built into MX2) sends excess motor energy into a resistor to slow
the motor and load (See "Introduction" in section 5-1 (page 227) and
"Dynamic Braking" in section 5-3 (page 229) for more information). For loads
that continuously overhaul the motor for extended periods of time, the MX2
may not be suitable (contact your Omron distributor).
The inverter parameters include acceleration and deceleration, which you can
set to match the needs of the application. For a particular inverter, motor, and
load, there will be a range of practically achievable accelerations and deceler-
ations.
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