Yaskawa iQpump Controller Programming Manual Manuel d'utilisateur télécharger pdf (Page 86)

86 YASKAWA TM.iQp.07 iQpump Controller Programming Manual

Adjustment of the bias setting will likewise adjust the speed command that is equivalent to the minimum analog input level (0 Vdc or 4

mA). If, for instance, the bias is set to –25%, then 0 Vdc or 4 mA will be equivalent to a –25% speed command. Since the minimum

speed command is 0% an analog input of 2 to 10 Vdc or 7.2 to 20 mA will now be equivalent to 0-100% speed command span.

Figure 1.74

Figure 74. Output Frequency with Reduced Bias Setting

As a further example, for an inverse-acting speed command, set the bias = 100% and the gain = 0%. The minimum analog input level (0

Vdc or 4 mA) will produce a 100% speed command and the maximum analog input level (10 Vdc or 20 mA) will produce a 0% speed

command.

Figure 1.75

Figure 75. Output Frequency with Inverted Gain and Bias Settings

2 V

7.2 mA

Analog Input Signal

20mA

4mA

10V

Gain = 100%

Bias = 0%

Output

Frequency

Analog Input Level

Analog Input Signal

Bias

Gain

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Yaskawa iQpump Controller Programming Manual Manuel d'utilisateur Page 86