Page 4–100
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 4: AC Drive Parameters
Type Hex Addr Dec Addr
P4.19 AI3 Input Bias (Offset)
♦R/W 0413 41044
Range/Units (Format: 16-bit signed) Default
–100�0% to +100�0%
0
Type Hex Addr Dec Addr
P4.20 AI3 Input Bias (Offset) Polarity
R/W 0414 41045
Range/Units (Format: 16-bit binary) Default
0: NO Offset
1: Positive Offset
2: Negative Offset
0
Type Hex Addr Dec Addr
P4.21 +AI3 Input Gain
♦R/W 0415 41046
P4.22 -AI3 Input Gain
♦R/W 0416 41047
Range/Units (Format: 16-bit signed) Default
–500�0% to +500�0%
100�0
Parameters P4.19 to P4.23 are used when the source of the Frequency Command is an analog
voltage signal connected to AI3.
•
AI3 is the only input that has ± voltage capability�
•
Bias is the same regardless of AI3 value, but Gain is different for positive/negative input�
The relationship between the external input voltage and setting frequency:
•
If P4�09=0: -10V to +10V corresponds to 0~60Hz�
•
If P4�09=1: 0V to +10V corresponds to 0~60Hz foward direction�
0V to -10V corresponds to 0~60Hz reverse direction�
•
P4�19 adjusts the bias (offset) for Analog Input #3�
•
P4�20 sets the offset polarity for Analog Input #3�
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�19�
•
P4�21 adjusts the gain for Analog Input #3 when the input is positive�
•
P4�22 adjusts the gain for Analog Input #3 when the input is negative�
•
P4�23 provides a delay to serve as an electrical noise filter for Analog Input #3�
P4.19
thru
P4.22
Offset Polarity Analog Command Calculation
Positive P4�20=1 Frequency Output (Hz) = [ (Analog In %) x (Gain %) + (Bias %) ] x (Max Out Hz)
Negative P4�20=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�21 or P4�22) ± (P4�19) ] x (P0�04)
NOTE: P4.24 must be set to enable bias and gain calculations for this AI.
NOTE: Gain% is dependent on P4.20 setting. If P4.20=1 use P4.21 for Gain% calculation. If
P4.20=2 use P4.22 for Gain% calculation.
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
P4.23 AI3 Filter
♦R/W 0417 41048
Range/Units (Format: 16-bit unsigned) Default
0�00~20�00 sec
0�01
This parameter sets a delay for Analog Input #3 to filter a noisy signal.
When the setting of P4.23 is too large, the reading of AI3 will be more stable but the control
response will be slower. When the setting of P4.23 is too small, the control response will be faster
but the control may be unstable due to a noisy AI3 reading. To find the optimal setting, adjust the
setting according to the desired amount of response vs signal accuracy.
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