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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
1132
Pre-charge change increment
A626
amount
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
1133
Second pre-charge change
increment amount
A666
 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 the 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
*1
When two or more ends conditions are satisfied, the pre-charge operation ends by the first-satisfied condition.
426
5. PARAMETERS
5.11 (A) Application 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 to 100%
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
0 to 100%,
9999
9999
Pre-charge ending condition setting
Pr.762 setting
Not assigned
9999
Assigned
Not assigned
Other than 9999
Assigned
Not assigned
9999
Assigned
Not assigned
Other than 9999
Assigned
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 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
Set the change increment amount per second after the automatic
switchover frequency is reached. (for vertical pumps).
Constant-speed operation after the automatic switchover frequency is
reached (for horizontal pumps).
Refer to Pr.760.
Refer to Pr.761.
Refer to Pr.762.
Refer to Pr.763.
Refer to Pr.764.
Refer to Pr.1132.
Pre-charge
function
X77 signal
Disabled
Enabled
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
Time
Time
Result
Result
Result
Time
Result
Time
*1
X77
X77
X77
X77

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