Mitsubishi Electric FR-F820-00046 Instruction Manual page 347

Fr-f800 series
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*2
Use Pr.148 Stall prevention level at 0 V input and Pr.149 Stall prevention level at 10 V input to adjust bias and gain for setting the stall
prevention operation level under V/F control and Advanced magnetic flux vector control.
 Changing the torque for the maximum analog input (C18 (Pr.920), C40
(Pr.933))
• Use C18 (Pr.920) or C40 (Pr.933) to change the stall prevention operation level setting (gain) of the maximum analog input
voltage (current).
 Analog input bias/gain calibration (C16 (Pr.919) to C19 (Pr.920), C38
(Pr.932) to C41 (Pr.933))
• "Bias"/"gain" function can adjust the relation between the stall prevention operation level and the setting input signal.
Examples of setting input signals are 0 to 5 VDC, 0 to 10 VDC, or 4 to 20 mADC, and they are externally input.
• Set the bias value of the terminal 1 input using C16 (Pr.919). (Shipped from factory with the stall prevention operation level
for 0 V)
• Use C18 (Pr.920) to set the stall prevention operation level against the input voltage set by Pr.73 Analog input selection.
(The initial value is 10 V.)
• Set the bias value of the terminal 4 input using C38 (Pr.932). (The initial value is the stall prevention operation level for 4
mA.)
• Use C40 (Pr.933) to set the stall prevention operation level against the 20 mA input of the input current (4 to 20 mA).
(-5V)
Bias
(-10V)
C16(Pr.919)
-100%
Calibration example of terminal 1
*1
If a negative command is given, the stall prevention operation level is regarded as "0".
• There are three methods to adjust the bias/gain for voltage (current) setting.
Adjustment by applying voltage (current) between terminals 1 and 5 (4 and 5) to set the voltage (current) at the bias/gain
level.
page 348
Adjustment by selecting the voltage (current) at the bias/gain level without applying voltage (current) between terminals 1
and 5 (4 and 5).
Adjustment by changing the stall prevention operation level only without adjusting the voltage (current).
NOTE
• Always calibrate the input after changing the voltage/current input signal with Pr.73 (Pr.267) and the voltage/current input
selection switch.
 Display unit changing for analog input (Pr.241)
• The analog input display unit (%/V/mA) can be changed for analog input bias/gain calibration.
• Depending on the terminal input specification setting of Pr.73 (Pr.267), the unit of the displayed value of C17 (Pr.919), C19
(Pr.920), C39 (Pr.932), and C41 (Pr.933) changes as follows:
346
5. PARAMETERS
5.9 (T) Multi-function input terminal parameters
400
150
Initial value
0
0
Torque setting signal
0
C17(Pr.919)
-150
page 349
400
Gain
150
C18(Pr.920)
Bias
100%
5V
C38
10V
(Pr.932)
C19(Pr.920)
Initial value
0
20
0
4
Torque setting signal
C39(Pr.932)
Calibration example of terminal 4
Gain
C40
(Pr.933)
100%
20mA
C41(Pr.933)
page 350

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