YASKAWA E7U Programming Manual page 83

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%
Parameters H3-10 and H3-11 perform the same function for the A2 analog input that parameters H3-02 and H3-03 perform for
the A1 analog input. Please refer to the parameter description for H3-02 and H3-03 for information about H3-10 and H3-11.
These parameters could be used for final calibration of a factory or field installed pressure to electric transducer input
connected to terminal A2 and AC. This field calibration may be needed if there is a job site variation from the typical 3 to 15
PSIG pneumatic signal input range.
H3-12 Analog Input Filter Time Constant
Setting Range: 0.0 to 2.00 Seconds
Factory Default: 0.30 Seconds
An analog input filter can be used to prevent erratic 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 Drive operation
becomes more stable the longer the time programmed, but it becomes less responsive to rapidly changing analog signals.
H3-13 Master Frequency Reference Terminal Selection
Setting
0 Main Fref= A1(factory default)
1 Main Fref= A2
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.
input
Noisy
signal
Fig. 58 Analog Input Filter Time Constant Effect on "Noisy" Signal
Description
Analog
Input
Filter
Programming 77
Analog
Internal Analog Input Valve
(Filtered)
input post