Yaskawa iQpump Controller Programming Manual - Manual (Page 92)

92 YASKAWA TM.iQp.07 iQpump Controller Programming Manual
◆ H3-12 Analog Input Filter Time Constant
Setting Range: 0.00 ~ 2.00 s
Factory Default: 0.30 s
An analog input filter can be used to prevent erratic iQpump drive control when a “noisy” analog reference is used. Parameter H3-12 sets
the time constant for a first order filter that will be applied to both the A1 and A2 analog inputs. The iQpump drive operation becomes
more stable the longer the time programmed, but it becomes less responsive to rapidly changing analog signals.
Figure 1.83
Figure 82. Analog Input Filter Time Constant Effect on “Noisy” Signal
◆ H3-13 Master Frequency Reference Terminal Selection
Parameter H3-13 allows the programmer to select which analog input will serve as the Speed Command input when “Terminals” are
selected as the Auto Mode Speed source (b1-01 = “1: Terminals”), or Terminal is selected as the reference source for the Hand mode (b1-
12 = “1: Terminals”). For the A2 analog input to be an effective selection for the H3-13 parameter, parameter H3-09 must be configured
as Aux Reference (H3-09 = “2: Aux Reference”).
If H3-09
≠2, then the A1 analog input will be used regardless of the setting of parameter b1-12.
Setting Description
0 Main Fref = A1 ( factory default )
1 Main Fref = A2
Analog
Input
Filter
Noisy input
signal
Analog
input post
Internal Analog Input Valve
(Filtered)