3G3AX-DL4004 Omron, 3G3AX-DL4004 Datasheet - Page 52

• Manufacturer Part Number: 3G3AX-DL4004
• Description: DC Reactor 0.4 KW 400V
• Manufacturer: Omron

Specifications of 3G3AX-DL4004

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Overview of Braking Resistor Selection
■ Applications Requiring Braking Resistors
In applications where excessive regenerative motor energy is
produced during deceleration or descent, the main-circuit volt-
age in the Inverter may rise high enough to damage the Inverter.
Standard Inverters are equipped with an overvoltage protection
function so the main-circuit overvoltage (OV) is detected and
operation is stopped to prevent damage. Although the Inverter
will be protected, the overvoltage protection function will gener-
ate an error and the motor will stop; this system configuration will
not provide stable continuous operation.
● About Regenerative Energy
The load connected to the motor has kinetic energy if it is rotat-
ing or potential energy if it is at a high level. The kinetic or poten-
tial energy is returned to the Inverter when the motor decelerates
or lowers the load. This phenomenon is known as regeneration
and the returned energy is called regenerative energy.
● Avoiding the Use of a Braking Resistor
The following methods can be used to avoid having to connect a
Braking Resistor. These methods require the deceleration time
to be extended, so you must evaluate whether extending the
deceleration time will cause any problems in the application.
60
• Enable the "stall prevention during deceleration" function; the
• Set a longer deceleration time. (This reduces the rate at which
• Select "coast to stop" as the stopping method. (Regenerative
Overview of Inverter Selection
default setting for this function is enabled. (The deceleration
time is extended automatically to prevent main-circuit overvolt-
age from occurring.)
the regenerative energy is produced.)
energy will not be returned to the Inverter.)
Inverter
Regenerative
energy
Overview of Inverter Selection
Motor
During deceleration, the Inverter acts as
a generator and converts kinetic and
potential energy to regenerative energy.
Load
Kinetic energy
Potential energy
■ Simple Method for Braking Resistor Selection
This is a simple method for determining the braking resistance
from the percentage of time that regenerative energy is produced
during a normal operating pattern.
t: Deceleration time (regenerative time)
T: Time for 1 cycle of operation
Use rate (duty) = t/T x 100 (%ED)
T
t