Mitsubishi FR-A800

(T) Multi-Function Input Terminal Parameters
PARAMETERS
423
5
GROUP
T
Calibration of analog input bias and gain (C16 (Pr.919) to C19 (Pr.920),
C38 (Pr.932) to C41 (Pr.933))
• The "bias" and "gain" functions are used to adjust the relationship between the setting input signal such as 0 to 5 VDC/0 to
10 VDC or 4 to 20 mADC entered from outside for torque command or setting the torque limit and the torque.
• Set the bias torque of the terminal 1 input using C16 (Pr.919). (Shipped from factory with torque for 0 V)
• Set the torque against the torque command voltage set by Pr.73 Analog input selection with C18(Pr.920). (Initial value is
10 V.)
• Set the bias torque of the terminal 4 input using C38 (Pr.932). (The initial value is the torque for 4 mA.)
• Set the torque against the 20 mA for torque command current (4 to 20 mA) with C40 (Pr.933).
 A negative voltage (0V to -10 V (-5 V)) is valid as a torque command.
If a negative voltage is input as a torque limit value, the torque limit is regarded as "0".
• There are three methods to adjust the torque setting voltage (current) bias and gain.
-
Method to adjust arbitrary point with application of a voltage (current) between terminals 1 and 5 (4 and 5). page 424
- Method to adjust arbitrary point without application of a voltage (current) between terminals 1 and 5 (4 and 5). page
425
- Method to adjust only torque without adjusting voltage (current). page 426
NOTE
• Always calibrate the input after changing the voltage/input signal with Pr.73, Pr.267, and the voltage/current input selection
switch.
Analog input display unit changing (Pr.241)
• The analog input display unit (%/V/mA) for analog input bias and gain calibration can be changed.
• Depending on the terminal input specification set to Pr.73 and Pr.267, the display units of C17 (Pr.919), C19 (Pr.920), C39
(Pr.932), and C41 (Pr.933) will change as shown below.
Analog command
(terminals 1 and 4)
(Depends on Pr.73, Pr.267)
Pr.241 = 0 (initial value) Pr.241 = 1
0 to 5 V input 0 to 5 V  0 to 100% (0.1%) display 0 to 100%  0 to 5 V (0.01 V) display
0 to 10 V input 0 to 10 V  0 to 100% (0.1%) display 0 to 100%  0 to 10 V (0.01 V) display
0 to 20 mA input 0 to 20 mA  0 to 100% (0.1%) display 0 to 100%  0 to 20 mA (0.01 mA)
Calibration example of terminal 1
400
150
-150
0
0
Torque setting signal
100%
10V
Initial value
Bias
05V
(-5V)
-100%
(-10V)
C18(Pr.920)
Gain
C16(Pr.919)
C17(Pr.919) C19(Pr.920)
Torque(%)
∗1
400
150
0
Torque setting signal
100%
Bias
0
20
4 20mA
C40
(Pr.933)
Gain
C38
(Pr.932)
C39(Pr.932) C41(Pr.933)
Calibration example of terminal 4
Torque(%)
Initial value