Mitsubishi Electric 800 Series Instruction Manual page 278

 Adjustment by changing the frequency without adjusting the voltage (current) (Example of
changing the gain frequency from 60 Hz to 50 Hz)
Operating procedure
1.
Selecting the parameter
Turn the setting dial or press the UP/DOWN key until "P.125" (Pr.125) appears for terminal 2, or "P.126" (Pr.126)
for terminal 4.
Press the SET key to show the present set value. (60.00 Hz)
2.
Changing the maximum frequency
Turn the setting dial or press the UP/DOWN key to change the value to "50.00". (50.00 Hz)
Press the SET key to confirm the setting. "50.00" blinks.
3.
Selecting the mode and the monitor item
Press the MODE key three times to select the monitor mode and to monitor a frequency.
4.
Start
Turn ON the start switch (STF/STR signal), and turn the frequency setting potentiometer clockwise slowly to full.
(Refer to steps 2 and 3 in
The motor is operated at 50 Hz.
NOTE
• If the frequency meter (display meter) connected to terminal FM or terminal AM of the standard model does not indicate exactly
60 Hz, set the calibration parameter C0 or C1. (Refer to
• If the voltage (current) values at the gain and bias frequencies are too close to each other, an error "Er3" may be indicated.
• Changing C4 or C7 (gain adjustment) will not change the Pr.20.
• To set the value to 120 Hz or higher, the Pr.18 High speed maximum frequency needs to be 120 Hz or higher. (Refer to
page 211.)
• Use the calibration parameter C2 or C5 to set the bias frequency. (Refer to
CAUTION
• Be cautious when setting any value other than "0" as the bias frequency at 0 V (0 mA). Even if a speed command is not
given, simply turning ON the start signal will start the motor at the preset frequency.
Parameters referred to
Pr.1 Maximum frequency, Pr.18 High speed maximum
Pr.20 Acceleration/deceleration reference
Pr.73 Analog input selection, Pr.267 Terminal 4 input
Pr.79 Operation mode selectionpage 174
Pr.858 Terminal 4 function assignmentpage 270
page 35.)
frequencypage 211
frequencypage 158
selectionpage 266
page 241.)
page 273.)
12. (T) Multi-Function Input Terminal Parameters
12.4 Frequency setting voltage (current) bias and gain
11
12
13
14
15
16
17
18
19
20
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