Mitsubishi Electric FR-A700 Series, Technical Manual

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408
PARAMETER
(5) PID automatic switchover control [ Pr. 127 ]
For a fast system startup at an operation start, the
inverter can be started up in normal operation mode
only at a start.
When the frequency is set to [
Pr. 127 PID control
automatic switchover frequency ] within the range of 0 to
400Hz, the inverter starts up without PID operation
from a start until output frequency is reached [
Pr.
127 ], and then it shifts to PID control. Once the
inverter has entered PID control operation, it
continues PID control even if the output frequency
falls to or below [
Pr. 127 ].
(6) PID output interruption function (SLEEP
function) (SLEEP signal) [ Pr. 575 to 577 ]
If the output frequency after PID calculation remains
lower than the [
Pr. 576 Output interruption detection
level ] setting for longer than the time set in [ Pr. 575
Output interruption detection time ], the inverter stops
operation. The energy consumption in the inefficient
low speed region can be reduced.
When the deviation (= set value - process value)
reaches the PID output shutoff cancel level ([
Pr. 577 ]
setting - 1000%) while the PID output interruption
function is on, the PID output interruption function is
canceled and PID control operation is resumed
automatically.
While the PID output interruption function is on, the
PID output interruption signal (SLEEP) is output. At
this time, the inverter running signal (RUN) is OFF,
and the PID control operating signal (PID) is ON.
(7) PID monitor function
The PID control set value, measured value and
deviation value can be displayed on the operation
panel and output from terminal FM and AM.
Integral value indicating a negative % can be
displayed on the deviation monitor. 0% is displayed
as 1000. (The deviation monitor cannot be output
from the terminal FM and AM.)
For each monitor, set the following value in [
Pr. 52
DU/PU main display screen data selection ] and [ Pr. 54
FM terminal function selection ], [ Pr. 158 AM terminal
function selection ].
(8) Adjustment procedure
Output
frequency
[ Pr.127 ]
STF
Time
PID
Normal
operation
PID control
A700 F700 D700
Output
frequency
Deviation
Reverse action ([ Pr. 128 = 10])
[ Pr. 577 ] - 1000%
Time
[ Pr. 575 ] or more
SLEEP period
Cancel
level
ޣ
Pr. 576
ޤ
RUN
ON
OFF
SLEEP
PID
[Pr. 52,
54, 158]
Setting
Monitor
Description
Terminal FM,
AM
Full Scale
Remarks
52 PID set point 100% For deviation input
([
Pr. 128 = 10, 11 ]),
the monitor values
always displayed
as 0.
53
PID measured
value
100%
54 PID deviation —
Value cannot be
set to [
Pr. 54, 158 ]
Displays 1000
when the PID
deviation is 0%.
Parameter setting
Adjust the PID control parameters,
[
Pr. 127 to 134 ] and [ Pr. 575 to 577
].
Terminal setting
Set the I/O terminals for PID
control ([
Pr. 178 to 189 Input
terminal function selection ], [ Pr. 190
to 196 Output terminal function
selection
])
Turn on the X14
signal
* When the X14 signal is not
assigned in , only
the [ Pr. 128
≠
0 ] setting
makes PID control valid.
Operation
A700 F700
A700 F700 D700
E700 D700