Page 4–98
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 4: AC Drive Parameters
Type Hex Addr Dec Addr
P4.10 AI1 Input Bias (Offset)
♦R/W 040A 41035
Range/Units (Format: 16-bit signed) Default
–100�0% to +100�0%
0
Type Hex Addr Dec Addr
P4.11 AI1 Input Bias (Offset) Polarity
♦R/W 040B 41036
Range/Units (Format: 16-bit binary) Default
0: NO Offset
1: Positive Offset
2: Negative Offset
0
Type Hex Addr Dec Addr
P4.12 AI1 Input Gain
♦R/W 040C 41037
Range/Units (Format: 16-bit signed) Default
–500�0% to +500�0%
100�0
Parameters P4.10 to P4.13 are used when the source of the Frequency Command is an analog
voltage signal connected to AI1. The relationship between the external input voltage (current) and
setting frequency: 0~10V (4~20mA) corresponds to 0~60Hz.
•
P4�10 adjusts the bias (offset) for Analog Input #1�
•
P4�11 sets the offset polarity for Analog Input #1�
If the application requires a negative offset, but the PLC cannot supply a negative number, choose
“Negative Offset” and enter a positive number in P4�10�
•
P4�12 adjusts the gain for Analog Input #1�
•
P4�13 provides a delay to serve as an electrical noise filter for Analog Input #1�
P4.10
thru
P4.12
Offset Polarity Analog Command Calculation
Positive P4�11=1 Frequency Output (Hz) = [ (Analog In %) x (Gain %) + (Bias %) ] x (Max Out Hz)
Negative P4�11=2 Frequency Output (Hz) = [ (Analog In %) x (Gain %) - (Bias %) ] x (Max Out Hz)
Calculation by
Parameter #s
Frequency Output (Hz) = [ (AI Volts / 10) x (P4�12) ± (P4�10) ] x (P0�04)
NOTE: P4.24 must be set to enable bias and gain calculations for this AI.
NOTE: Refer to the detailed Analog Input Examples (page 4–112) at the end of these “Group P4.xx Details –
Analog Parameters” listings for more information.
Type Hex Addr Dec Addr
P4.13 AI1 Filter
♦R/W 040D 41038
Range/Units (Format: 16-bit unsigned) Default
0�00~20�00 sec
0�01
This parameter sets a delay for Analog Input #1 to filter a noisy signal.
When the setting of P4.13 is too large, the reading of AI1 will be more stable but the control
response will be slower. When the setting of P4.13 is too small, the control response will be faster
but the control may be unstable due to a noisy AI1 reading. To find the optimal setting, adjust the
setting according to the desired amount of response vs signal accuracy.
Type Hex Addr Dec Addr
P4.14 reserved
n/a 040E 41039
Range/Units Default
n/a
n/a
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