Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 455 / 608

Parameter Special operation
FR-E700 SC EC/ENE 6 - 301
PID control automatic switchover control (Pr. 127)
For a fast system start-up at an operation start, the system 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
0 to 400 Hz, the system starts up in normal operation mode from a start until Pr. 127 is reached, and
then it shifts to PID control operation mode. Once the system has entered PID control operation, it
continues PID control if the output frequency falls to or below Pr. 127.
PID monitor function
The PID control set point, measured value and deviation value can be displayed on the operation pan-
el and output from terminal 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 AM.)
For each monitor, set the following value in Pr. 52 "DU/PU main display data selection" and Pr. 158
"AM terminal function selection".
Adjustment procedure
I001234E
Fig. 6-153: Automatic switchover to PID control
Setting Monitor Description
Minimum
Increment
Terminal AM
Full Scale
Remarks
52 PID set point 0.1% 100%
—
53
PID measurement
value
0.1% 100%
54 PID deviation value 0.1% —
Value cannot be output from the terminal AM.
The PID deviation value of 0% is displayed as
1000.
Tab. 6-114: PID monitor function
Fig. 6-154:
Adjustment procedure
Output frequency
Normal
operation
PID control
Time
Parameter setting
Adjust the PID control
parameters Pr. 127 to
Pr. 134.
Set the I/O terminals for PID
control. (Pr. 178 to Pr. 184 and
Pr. 190 to Pr. 192.)
Terminal setting
Turn on the
X14 signal
Operation
When X14 signal is not
assigned, setting a value other
than "0" in Pr. 128 activates PID
operation.