Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 768 / 1218

(A) Application parameters Parameters
5 - 566
5.14.12 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.
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.
Pr. Name
Initial
value
Setting
range
Description
760
A616
Pre-charge fault selection 0
0
Fault indication with output shutoff immediately after
pre-charge fault occurs.
1
Fault indication with deceleration stop after pre-charge
fault occurs.
761
A617
Pre-charge ending level 9999
0 to 100%
Set the measured amount to end the pre-charge
operation.
9999 Without pre-charge ending level
762
A618
Pre-charge ending time 9999
0 to 3600 s Set the time to end the pre-charge operation.
9999 Without pre-charge ending time
763
A619
Pre-charge upper
detection level
9999
0 to 100%
Set the upper limit for the pre-charged amount. A pre-
charge fault occurs when the measured value exceeds
the setting during pre-charging.
9999 Without pre-charge upper limit level
764
A620
Pre-charge time limit 9999
0 to 3600 s
Set the time limit for the pre-charged amount. A pre-
charge fault occurs when the pre-charge time exceeds
the setting.
9999 Without pre-charge time limit
765
A656
Second pre-charge fault
selection
0 0, 1 Refer to Pr. 760.
Set the second pre-charge
function.
The second pre-charge function is
valid when the RT signal is ON.
766
A657
Second pre-charge ending
level
9999
0 to 100%,
9999
Refer to Pr. 761.
767
A658
Second pre-charge ending
time
9999
0 to 3600 s,
9999
Refer to Pr. 762.
768
A659
Second pre-charge upper
detection level
9999
0 to 100%,
9999
Refer to Pr. 763.
769
A660
Second pre-charge time
limit
9999
0 to 3600 s,
9999
Refer to Pr. 764.