1-15
D Feedback Loss Detection for PID Control (Parameters b5-12 to b5-14)
A
function has been added to detect the loss of the feedback signal (e.g., as
a result of line disconnec
-
tion) and specify the operation when an error is detected.
D PID Control Target Value Added to Multi-function Inputs (Parameters H3-05 and
H3-09)
A
function was added so
that both the analog frequency reference and the PID control target value can
be input as analog signals for frequency reference + PID control.
D PID Integral Hold Added to Multi-function Inputs (Parameters H1-01 to H1-06)
A function was added to hold the the calculated integral value for PID control.
D Jump Frequencies Added to PID Control (Parameters d3-01 to d3-04)
The
setting disabled frequencies (jump frequencies) have been enabled
for PID control. This function
can be used to avoid frequency ranges that cause machine vibration during PID control.
H Motor Startup Responsiveness Improved
Compensation functions have been added to ensure faster motor startup.
D Startup Torque Compensation Function for Open-loop Vector Control (Parameters
C4-03 to C4-05)
A
startup torque compensation function has been added to ensure faster startup for open-loop
vector
control.
If this function is used, high torque can
be output immediately after startup to enable better con
-
trol of lifting and lowering operations for large machines with high friction or cranes.
Note This function cannot be used during regenerative condition or when using a second motor.
D Magnetic Flex Compensation (Parameter b2-08)
Large-capacity
motors have large electrical constants, and time is required to develop magnetic flex in
the motor after power has been turned ON. To improve this situation, a magnetic flex compensation
function
has been added to the startup DC braking function, enabling magnetic flex to be built up in the
motor during DC braking.
H Braking Function with Stall Prevention during Deceleration (Parameter
L3-04)
Even
if regenerative energy is handled using a Braking Resistor or Braking Resistor Unit, overvoltages
(OV)
can be detected during rapid deceleration. A stall prevention function for deceleration has been
added
to the braking function (regeneration processing) to limit voltages when main circuit overvoltages
are likely to be detected, thus enabling faster braking without overvoltage detection.
H Inverter Overload (OL2) Protection Selection for Low-speed Operation
(Parameters L8-17 and L8-19)
An
Inverter overload protection operation selection has been added to protect from overcurrent
dam
-
age
at low speeds. This function allows the best protection to be
selected according to the application.
Introduction Chapter
1
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