H3 analog inputs, Analog input signal – Yaskawa iQpump Controller User Manual User Manual

Page 111

Advertising
background image

Pump Tuning

YASKAWA TM.iQp.06 iQpump Controller User Manual

111

H3 Analog Inputs

H3-02 Terminal A1 Gain Setting

Setting Range: 0.0 ~ 1000.0 %
Factory Default: 100.0 %

H3-03 Terminal A1 Bias Setting

Setting Range:

−100.0 % ~ +100.0 %

Factory Default: 0.0 %

In order to have the iQpump drive properly interpret an analog input, it may be necessary to apply a gain and / or a bias to the signal. The
analog inputs have a resolution of 10 bits (1024 steps). Using the factory default settings for the analog input’s gain and bias, the 0 ~ 10

Vdc or 4-20 mA signal at the analog input will yield a 0 ~ 100 % speed command span.

Figure 5.19

Figure 5.34 Output Frequency as Commanded Via Analog Input

If a different span of analog input signal is desirable, it will be necessary to adjust the gain, the bias, or both to allow the analog input

level to generate the desired frequency command. Adjustment of the gain setting will change the speed command that is equivalent to the
maximum analog input (10 Vdc or 20 mA). If, for instance, the gain is increased to 200 %, then 10 Vdc or 20 mA will be equivalent to a
200 % speed command and 5 Vac or 12 mA will be equivalent to a 100 % Speed Command. Since the iQpump drive output is limited by

the maximum frequency parameter (E1-04), 0 - 5 Vdc or 4 ~ 12 mA will now be equivalent to 0 - 100 % speed command span.

Figure 5.20

Figure 5.35 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 (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 2.5 to10 Vdc or 8 to 20 mA will now be equivalent to 0 ~ 100 % speed command span.

Signal

Gain = 100 %

Bias = 0 %

0 V
4 mA

10 V
20 mA

Analog Input Signal

Ou

tp

u

t

F

requenc

y

Analog Input Signal

5V

12mA

Gain = 200 %

Bias = 0 %

0 V
4 mA

10 V
20 mA

Analog Input Signal

Ou

tp

u

t

Fr

e

q

u

e

n

c

y

5 V
12 mA

100 %

Advertising