3-71
Note 1. The
Inverter in speed search operation will work according to the speed search V/f character
-
istics
set with n054 and
when the output current becomes less than the speed search opera
-
tion level set with n052, the Inverter will have normal acceleration output.
Note 2. The speed search command must be ON for at least the minimum baseblock time set with
n053
after the run command is input, otherwise the speed search operation
is not available.
Note 3. Adjust the minimum baseblock time set with n053 for the most suitable timing to start the
speed search operation.
Note 4. It
is usually
not necessary to change the default-set values of n052 and n054. Set n052 to a
smaller value if the motor does not restart after the speed search operation completes.
Note 5. Input
the run command
in 5 ms or more after the speed search command is input to permit the
Inverter to be in reliable speed search operation.
D Integral Value of PID Control Reset Command/PID Control Invalidating Command
(Set Value = 18 or 19)
• Integral Value Reset (Set Value = 18)
If
the integral value reset command is input, the integral value used for PID control will be reset and the
integral operation output will be zero.
The integral operation output will remain zero while this command is input.
Input
this command to stop the integral operation to temporarily prevent rapid changes of the output of
the Inverter.
• PID Control Invalidating Command (Set Value = 19)
Use
this command to change the type of control performed by the Inverter from PID control, such as
JOG
control,
to the usual control, such as constant speed control with a frequency reference, and vice
versa.
The
Inverter will stop performing PID control if this command is input
and the Inverter will use input to
the
FV terminal as a frequency reference. If n002 is set to 0 or 1, however
, the Inverter will use frequen
-
cy references 1 to 4.
D PID Input Characteristic Selection (Set Value: 27)
Note This can only be set in n039.
It
is possible to switch the input characteristic for PID control. The PID control deviation
can be multiplied
by –1 to control sensors with negative characteristics. “Negative characteristic” refers to operation
where
the feedback value decreases when the Inverter
’
s output frequency increases. This function is
useful
for control that alternates between positive
and negative characteristics because of the changing
direction
of the motor
. Control that has a constantly negative characteristic can be achieved by setting
PID control function selection (n084) to 3.
D Timer Function Input (Set Value = 20)
Timer
function input is a standard sequential
input. By setting appropriate delay time values with n077
and n078, the Inverter can prevent the sensor from chattering.
The Inverter will turn ON timer function output if timer function input to the Inverter is ON for a period
longer than the timer function ON-delay time set with n077.
The
Inverter will turn OFF timer function output if
timer function input to the Inverter is OFF for a period
longer than the timer function OFF-delay time set with n078.
Preparing for Operation Chapter 3
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