Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 463 / 608

Parameter Special operation
FR-E700 SC EC/ENE 6 - 309
Parameter details
When ratio (Pr. 128 = 42, 43) is selected for addition method, PID control × (ratio of main speed) is add-
ed to the main speed. The ratio is determined by the Pr. 125 "Terminal 2 frequency setting gain fre-
quency" and C2 (Pr. 902) "Terminal 2 frequency setting bias frequency". The frequency setting signal
is set to 0 to 50 Hz in the range between 0 to 100% in the initial setting. The ratio is (× 100%) when the
main speed is 50 Hz and (× 50%) when 25 Hz.
Turning X14 signal on/off during operation by assigning X14 signal results in the following operation.
When X14 signal is on: Uses output frequency unchanged as the main speed command and con-
tinues operation by dancer control.
When X14 signal is off: Ends dancer control and continues operation at the set frequency made
valid.
Action of Pr. 129 "PID proportional band", Pr. 130 "PID integral time", Pr. 131 "PID upper limit", Pr. 132
"PID lower limit", Pr. 134 "PID differential time is the same as PID control. For the relationship of con-
trolled variable (%) of PID control and frequency, 0% is equivalent to the set frequency of Pr. 902 and
100% to Pr. 903.
For the Pr. 133 "PID action set point" setting, set frequency of Pr. 902 is equivalent to 0% and Pr. 903
to 100%. When 9999 is set in Pr. 133, 50% is the set point.
I001894E
Fig. 6-160: Signal calibration at terminal 2
NOTES
Even when C4 (Pr. 903) is set to other than 100%, the frequency setting signal is considered as
100%.
Even when C3 (Pr. 903) is set to other than 0%, the frequency setting signal is considered as 0%.
When C2 (Pr .902) is set to other than 0 Hz, the frequency setting signal is 0% when C2 (Pr. 902) is
less than the set frequency.
Pr. 128 PID Action
Addition
Method
Set Point Measured Value Main Speed Command
40 Reverse action
Fixed
Pr. 133 Terminal 4
Speed command for each
operation mode
41 Forward action
42 Reverse action
Ratio
43 Forward action
Tab. 6-117: PID control in dependence of parameter 128
NOTE Pr. 127 "PID control automatic switchover frequency" is invalid.
Frequency setting signals
Output fr
equenc
y [H
z]
0 100%
Initial value
Bias
50 Hz
C2
(Pr. 902)
Gain Pr. 125