YASKAWA E7N Technical Manual page 148

Fig 5.25 Output Frequency as Commanded via Analog Input with Increased Gain Setting
Adjustment of the bias setting will likewise adjust the speed command that is equivalent to the minimum analog input level
(0Vdc or 4mA). If, for instance, the bias is set to –25%, then 0Vdc or 4mA will be equivalent to a –25% speed command. Since
the minimum speed command is 0% an analog input of 2.5 to10Vdc or 8 to 20mA will now be equivalent to 0-100%
speed command span.
As a further example, for an inverse-acting speed command, set the bias= 100% and the gain= 0%. The minimum analog input
level (0Vdc or 4mA) will produce a 100% speed command and the maximum analog input level (10Vdc or 20mA) will
produce a 0% speed command.
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Gain =200%
100%
Bias = 0%
0V
4mA
Analog Input Level
Analog Input Signal
Gain = 100%
0V
4mA
2.5V
8mA
Bias = -25%
Fig 5.26 Output Frequency with Reduced Bias Setting
Bias
Gain = 100%
Gain
Bias = 0%
Fig 5.27 Output Frequency with Inverted Gain and Bias Settings
Programming 5 - 55
5V
10V
12mA 20mA
10V
20mA
Analog Input Signal
Analog Input Level
0V
10V
20mA
4mA
Analog Input Signal
Analog Input Level