Pid Pre-Charge Function - Mitsubishi Electric 800 Series Instruction Manual

(A) Application parameters
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.
Pr. Name
760 Pre-charge fault
A616 selection
761
Pre-charge ending level
A617
762
Pre-charge ending time
A618
763 Pre-charge upper
A619 detection level
764
Pre-charge time limit
A620
765 Second pre-charge fault
A656 selection
766 Second pre-charge
A657 ending level
767 Second pre-charge
A658 ending time
768 Second pre-charge
A659 upper detection level
769 Second pre-charge time
A660 limit
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:
Pr.127 setting
Pr.761 setting
9999 -
9999
Other than 9999
Other than 9999

When two or more ends conditions are satisfied, the pre-charge operation ends by the first-satisfied condition.
504
PARAMETERS
Initial
value
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
Pre-charge ending condition setting
Pr.762 setting
-
9999
Other than 9999
9999
Other than 9999
Setting
range
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 limit 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
X77 signal function
-
Disabled
Not assigned
Assigned
Not assigned
Assigned
Not assigned Enabled
Assigned
Not assigned
Assigned
Description
Set the second pre-charge function.
The second pre-charge function is
valid when the RT signal is ON.
Valid pre-charge ending
condition

-
- - X77
- Time -
- Time X77
Result - -
Result - X77
Result Time -
Result Time X77