Intelligent Functions And Parameters; Braking - Hitachi WJ200 Series Instruction Manual

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
panel
. Chapter 2 will show you how to get a motor running, using a minimal set of
function commands 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.

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 WJ200)
sends excess motor energy into a resistor to slow the motor and load (See
"Introduction" on page 5-2 and "Dynamic Braking" on page 5-5 for more information).
For loads that continuously overhaul the motor for extended periods of time, the
WJ200 may not be suitable (contact your Hitachi 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 decelerations.
digital operator, integrated operator,
1−21
digital operator
or