Pre-Charge Function (Pr.760 To Pr. 769) - Mitsubishi FR-F720-00046-NA Instruction Manual

4.20.3 Pre-charge function (Pr.760 to Pr. 769)

This function is to drive the motor at a certain speed before starting PID control. The motor is operated at Pr. 127
PID control automatic switchover frequency at start until a pre-charge ending condition is satisfied. PID control starts
after a pre-charge ending condition is satisfied. (This function is useful for a pump with a long hose. Without this
function, PID control would start before the pump is filled with water, and proper control would not be performed. )
Pre-charge function is also valid for a start after the PID output suspension (SLEEP). PID output suspension
(SLEEP) function is not performed until the pre-charge operation ends.
Parameter
Name
Number
760
Pre-charge fault
selection
761
Pre-charge ending
level
762
Pre-charge ending time
763
Pre-charge upper
detection level
764
Pre-charge time limit
765
Second pre-charge
fault selection
766
Second pre-charge
ending level
767
Second pre-charge
ending time
768
Second pre-charge
upper detection level
769
Second pre-charge
time limit
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 192)
...
Specifications differ according to the date assembled.
*1 Setting values of Pr. 761, Pr. 763, Pr. 766, Pr. 768 are without unit when "9999" is set to both of C42(Pr. 934) and C44(Pr. 935).
Initial Setting
Value Range
When the pre-charged amount exceeds Pr. 763 or the pre-
0 charged time exceeds Pr. 764, the output is immediately
shutoff, and the fault (E.PCH) is output.
0
When the pre-charged amount exceeds Pr. 763 or the pre-
1 charged time exceeds Pr. 764, the motor decelerates to stop,
and the fault (E.PCH) is output.
0 to 100% Set the measurement level to end the pre-charge operation.
*1
9999
9999 Without pre-charge ending level
0.0 to 3600s Set the time to end the pre-charge operation.
9999
9999 Without pre-charge ending time
Set the upper limit for the pre-charged amount. If the pre-
0 to 100% charged amount exceeds the set level, the fault (E.PCH) is
*1
9999
output.
9999 Without pre-charge upper detection level
Set the time limit for the pre-charge operation. If the pre-
0.0 to 3600s
charged time exceeds the set level, the fault (E.PCH) is output.
9999
9999 Without pre-charge time limit
When the pre-charged amount exceeds Pr. 768 or the pre-
0 charged time exceeds Pr. 769 while the RT signal is ON, the
output is immediately shutoff, and the fault (E.PCH) is output.
0
When the pre-charged amount exceeds Pr. 768 or the pre-
1 charged time exceeds Pr. 769 while the RT signal is ON, the
motor decelerates to stop, and the fault (E.PCH) is output.
Set the measurement level to end the pre-charge operation,
0 to 100%
*1
which is performed while the RT signal is ON.
9999
9999 Without second pre-charge ending level
Set the time to end the pre-charge operation, which is
0.0 to 3600s
9999 performed while the RT signal is ON.
9999 Without second pre-charge ending time
Set the upper limit for the pre-charged amount, which is
0 to 100% charged while the RT signal is ON. If the pre-charged amount
*1
9999
exceeds the set level, the fault (E.PCH) is output.
9999 Without second pre-charge ending level
Set the time limit for the pre-charge operation, which is
0.0 to 3600s performed while the RT signal is ON. If the pre-charged time
9999
exceeds the set level, the fault (E.PCH) is output.
9999 Without second pre-charge time limit
Refer to page 399 to check the SERIAL number.
PID control
Description
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