Pid Pre-Charge Function - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

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,
since PID control would start before the pump is filled with water, and proper control would not be performed without this
function,
Pr. Name
760
Pre-charge fault selection
A616
761
Pre-charge ending level
A617
762
Pre-charge ending time
A618
763 Pre-charge upper detection
A619 level
764
Pre-charge time limit
A620
765 Second pre-charge fault
A656 selection
766 Second pre-charge ending
A657 level
767 Second pre-charge ending
A658 time
768 Second pre-charge upper
A659 detection level
769
Second pre-charge time limit
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.
• The pre-charge function valid/invalid settings and pre-charge ending conditions are as follows:
Pre-charge ending condition setting
Pr.127 setting
Pr.761 setting
9999 —
9999
Other than
9999
Other than 9999
*1 When two or more ends conditions are satisfied, the pre-charge operation ends by the first-satisfied condition.
Initial Setting
value range
0
0
1
0 to 100%
9999
9999
0 to 3600 s
9999
9999
0 to 100%
9999
9999
0 to 3600 s
9999
9999
0 0, 1
0 to 100%,
9999
9999
0 to 3600 s,
9999
9999
0 to 100%,
9999
9999
0 to 3600 s,
9999
9999
Pr.762 setting X77 signal
— —
Not assigned
9999
Assigned
Not assigned
Other than 9999
Assigned
Not assigned
9999
Assigned
Not assigned
Other than 9999
Assigned
Description
Fault indication with output shutoff immediately after pre-charge fault
occurs.
Fault indication with deceleration stop after pre-charge fault occurs.
Set the measured amount to end the pre-charge operation.
Without pre-charge ending level
Set the time to end the pre-charge operation.
Without pre-charge ending time
Set the upper limit for the pre-charged amount. A pre-charge fault
occurs when the measured value exceeds the setting during pre-
charging.
Without Pre-charge upper detection level
Set the time limit for the pre-charged amount. A pre-charge fault occurs
when the pre-charge time exceeds the setting.
Without Pre-charge time limit
Refer to Pr.760.
Refer to Pr.761.
Refer to Pr.762.
Refer to Pr.763.
Refer to Pr.764.
Pre-charge
Valid pre-charge ending condition
function
Disabled —
—
—
—
Enabled Result
Result
Result
Result
Set the second pre-charge function.
The second pre-charge function is
valid when the RT signal is ON.
— X77
Time —
Time X77
— —
— X77
Time —
Time X77
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
*1
587