Pid Pre-Charge Function - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.14.11

PID pre-charge function

This function drives the motor at a certain speed before starting PID control. 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.
Pr.
760
A616
761
A617
762
A618
763
A619
764
A620
765
A656
766
A657
767
A658
768
A659
769
A660
Operation selection for the pre-charge function
● To enable the pre-charge function when PID control is enabled, set the pre-charge end conditions
at Pr. 761 "Pre-charge ending level" and at Pr. 762 "Pre-charge ending time", or set "77" to Pr. 178
to Pr. 189 (input terminal function selection). When operation is started, the inverter runs at the
frequency set to Pr. 127 "PID control automatic switchover frequency" to enter the pre-charge
state.
● Pre-charge ends and PID control starts after a pre-charge ending condition is satisfied.
● The pre-charge function is also activated at a start after release of a PID output suspension (SLEEP)
state or MRS (output shutoff ). The PID output suspension (SLEEP) function is not activated until
the started pre-charge operation ends.
● During pre-charge operation, the During pre-charge operation (Y49) signal is output. For the
terminal used for Y49 signal output, set "49 (positive logic)" or "149 (negative logic)" in any of
Pr. 190 to Pr. 196 (Output terminal function selection) to assign the function.
FR-A800
Name
Pre-charge fault selection
Pre-charge ending level
Pre-charge ending time
Pre-charge upper
detection level
Pre-charge time limit
Second pre-charge fault
selection
Second pre-charge ending
level
Second pre-charge ending
time
Second pre-charge upper
detection level
Second pre-charge time
limit
Initial Setting
Description
value range
Fault indication with output shutoff immediately after
0
pre-charge fault occurs.
0
Fault indication with deceleration stop after pre-charge
1
fault occurs.
Set the measured amount to end the pre-charge
0 to 100%
operation.
9999
9999 Without pre-charge ending level
0 to 3600 s 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. A pre-
0 to 100% charge fault occurs when the measured value exceeds
9999
the setting during pre-charging.
9999 Without pre-charge upper limit level
Set the time limit for the pre-charged amount. A pre-
0 to 3600 s charge fault occurs when the pre-charge time exceeds
9999
the setting.
9999 Without pre-charge time limit
0 0, 1 Refer to Pr. 760.
0 to 100%,
9999 Refer to Pr. 761.
9999
0 to 3600 s,
9999 Refer to Pr. 762.
9999
0 to 100%,
9999 Refer to Pr. 763.
9999
0 to 3600 s,
9999 Refer to Pr. 764.
9999
(A) Application parameters
Set the second pre-charge
function.
The second pre-charge function is
valid when the RT signal is ON.
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