Mitsubishi FR-A800

(A) Application parameters
PARAMETERS
517
5
GROUP
A
5.14.11 PID pre-charge function
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:
 When two or more ends conditions are satisfied, the pre-charge operation ends by the first-satisfied condition.
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
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.
Pr.127 setting
Pre-charge ending condition setting
Pre-charge
function
Valid pre-charge ending
condition

Pr.761 setting Pr.762 setting X77 signal
9999 - - -
Disabled -
Other than 9999
9999
9999
Not assigned
Assigned
Enabled
--X77
Other than 9999
Not assigned - Time -
Assigned - Time X77
Other than 9999
9999
Not assigned Result - -
Assigned Result - X77
Other than 9999
Not assigned Result Time -
Assigned Result Time X77