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PID control
4
PARAMETERS
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
Number
Name
Initial
Value
Setting
Range
Description
760
Pre-charge fault
selection
0
0
When the pre-charged amount exceeds Pr. 763 or the pre-
charged time exceeds Pr. 764, the output is immediately
shutoff, and the fault (E.PCH) is output.
1
When the pre-charged amount exceeds Pr. 763 or the pre-
charged time exceeds Pr. 764, the motor decelerates to stop,
and the fault (E.PCH) is output.
761
Pre-charge ending
level
9999
0 to 100%
*1 Set the measurement level to end the pre-charge operation.
9999 Without pre-charge ending level
762
Pre-charge ending time 9999
0.0 to 3600s Set the time to end the pre-charge operation.
9999 Without pre-charge ending time
763
Pre-charge upper
detection level
9999
0 to 100%
*1
Set the upper limit for the pre-charged amount. If the pre-
charged amount exceeds the set level, the fault (E.PCH) is
output.
9999 Without pre-charge upper detection level
764
Pre-charge time limit 9999
0.0 to 3600s
Set the time limit for the pre-charge operation. If the pre-
charged time exceeds the set level, the fault (E.PCH) is output.
9999 Without pre-charge time limit
765
Second pre-charge
fault selection
0
0
When the pre-charged amount exceeds Pr. 768 or the pre-
charged time exceeds Pr. 769 while the RT signal is ON, the
fault (E.PCH) is output.
1
When the pre-charged amount exceeds Pr. 768 or the pre-
charged time exceeds Pr. 769 while the RT signal is ON, the
motor decelerates to stop, and the fault (E.PCH) is output.
766
Second pre-charge
ending level
9999
0 to 100%
*1
Set the measurement level to end the pre-charge operation,
which is performed while the RT signal is ON.
9999 Without second pre-charge ending level
767
Second pre-charge
ending time
9999
0.0 to 3600s
Set the time to end the pre-charge operation, which is
performed while the RT signal is ON.
9999 Without second pre-charge ending time
768
Second pre-charge
upper detection level
9999
0 to 100%
*1
Set the upper limit for the pre-charged amount, which is
charged while the RT signal is ON. If the pre-charged amount
exceeds the set level, the fault (E.PCH) is output.
9999 Without second pre-charge ending level
769
Second pre-charge
time limit
9999
0.0 to 3600s
Set the time limit for the pre-charge operation, which is
performed while the RT signal is ON. If the pre-charged time
exceeds the set level, the fault (E.PCH) is output.
9999 Without second pre-charge time limit
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190)
... Specifications differ according to the date assembled. Refer to page 400 to check the SERIAL number.
*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).