Yaskawa iQpump Drive User Manual - Manual (Page 113)

5.1 iQpump Basic Programming Parameters
YASKAWA TM.iQp.01 iQpump Drive User Manual 113
Function: Aux Reference
Setting: 2
In order for the A2 analog input to be used as the master Speed Command, parameter H3-09 must be set for Aux Reference (H3-09 = “2:
Aux Reference”). Once A2 is configured as an auxiliary reference, it can be selected as the master Speed. Command by setting H3-13 =
“1: Main Fref TA2.” If H3-09 = 2, terminal A2 analog input will become the speed command when a digital input programmed for Multi-
Step Ref 1 (H1-0x = 3) is selected by a contact closure.
Function: PI Feedback
Setting: B
Configuring the A2 analog input as PI Feedback (H3-09 = “B: PI Feedback”) is a requirement of setting the iQpump drive up for PI
operation. The A2 analog input is the only source for feedback for PI operation though the setpoint can come from a number of different
sources (refer to the section covering the PI parameters for more information regarding specifying the setpoint source. PI parameters are
listed in section b5).
Parameters H3-10 (Terminal A2 Gain) and H3-11 (Terminal A2 Bias) can be used to configure the A2 analog input to match the signal
from the Feedback Transmitter.
The U1-24 monitor (PI Feedback) can be used to check the PI Feedback level with the digital operator.
Function: Frequency Bias 2
Setting: D
By setting H3-09 = “D: Frequency Bias 2,” the A2 analog input will serve as a bias signal to the A1 Speed Command. This setting
functions the same as a setting of H3-09 = 0: Frequency Bias.
Figure 5.43 Frequency Bias 2 Applied to Analog Speed Command
Function: PI Differential
Setting: 16
Normal PI operation will adjust the iQpump drive output in order to match the measured feedback value to a desired setpoint. When PI is
operated in the differential mode, however, the iQpump drive output is adjusted in order to maintain a desired differential between two
feedback signals.
When the A2 analog input is configured as a PI Differential (H3-09 = “16: PI Differential”), the A1 analog input becomes the other PI
Differential input. The desired differential is set by parameter b5-07 (PI Differential Setpoint) and can be set so that A2 is held less than
A1 (b5-07 < 0) or A2 is held greater than A1 (b5-07 > 0).
When PI Differential operation is chosen, the A1 feedback level can be monitored by U1-24 (PI Feedback) and the A2 feedback level can
be monitored by U1-53 (PI Feedback2).
Function: Not Used
Setting: 1F
When H3-09 = “1F: Not Used,” any signal applied to the A2 analog input will be ignored by the iQpump drive.
■
H3-10 Terminal A2 Gain Setting
Setting Range: 0.0 to 1000.0%
Factory Default: 100.0%
■
H3-11 Terminal A2 Bias Setting
Setting Range: – 100.0% to +100.0%
Factory Default: 0.0%
Factory Default
S
peed
C
o
mmand
10V A1 Voltage
S
peed
C
o
mmand
A1 Voltage 10V
H3-03
H3-02
With H3-03 applied
S
peed
A1 Voltage
10V
With both H3-03 and analog input bias
(H3-09=0) applied
H3-02
H3-03
S
peed
Command S
pe
e
d
Co
mm
an
d
S
p
eed
C
o
mmand
(H3-09 = D) applied