Mitsubishi Electric FR-F820-00077 Instruction Manual page 558

(A) Application parameters
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
9999
Other than 9999
Tab. 5-190: Settings of the pre-charge function
When two or more ends conditions are satisfied, the pre-charge operation ends by the first-
satisfied condition.
NOTES During the pre-charge operation, it is regarded as integrated value = estimated value. The motor
speed may drop shortly from the automatic switchover frequency depending on the parameter
settings.
Parameter changes and switchover to the second PID control are applied immediately. If PID con-
trol has not started when the settings were changed, PID control starts with changed settings. (If
PID control has already started, these settings do not apply. If the changed settings already satis-
fies a condition to start PID control, the PID control starts as soon as these are changed.)
The pre-charge also ends when PID control is set to invalid, the start command has been turned
OFF, and output has been shut off.
5 - 386
Pre-charge ending condition setting
Pr. 761 setting Pr. 762 setting
⎯ ⎯
9999
9999
Other than 9999
9999
Other than 9999
Other than 9999
Pre-charge
function
X77 signal
⎯
Disabled
Not assigned
Assigned
Not assigned
Assigned
Not assigned Enabled
Assigned
Not assigned
Assigned
Parameters
Valid pre-charge ending
condition
⎯
⎯ ⎯
X77
⎯ ⎯
Time
⎯
Time X77
⎯ ⎯
Result
⎯
Result X77
⎯
Result Time
Result Time X77