Chapter 4: AC Drive Parameters
Page 4–99
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Type Hex Addr Dec Addr
P4.15 AI2 Input Bias (Offset)
♦R/W 040F 41040
Range/Units (Format: 16-bit signed) Default
–100�0% to +100�0%
0
Type Hex Addr Dec Addr
P4.16 AI2 Input Bias (Offset) Polarity
R/W 0410 41041
Range/Units (Format: 16-bit binary) Default
0: NO Offset
1: Positive Offset
2: Negative Offset
0
Type Hex Addr Dec Addr
P4.17 AI2 Input Gain
♦R/W 0411 41042
Range/Units (Format: 16-bit signed) Default
–500�0% to +500�0%
100�0
Parameters P4.15 to P4.18 are used when the source of the Frequency Command is an analog
current signal connected to AI2. The relationship between the external input current (voltage) and
setting frequency: 4~20mA (0~10V) corresponds to 0~60Hz.
•
P4�15 adjusts the bias (offset) for Analog Input #2�
•
P4�16 sets the offset polarity for Analog Input #2�
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�15�
•
P4�17 adjusts the gain for Analog Input #2�
•
P4�18 provides a delay to serve as an electrical noise filter for Analog Input #2�
P4.15
thru
P4.17
Offset Polarity Analog Command Calculation
Positive P4�16=1 Frequency Output (Hz) = [ (Analog In %) x (Gain %) + (Bias %) ] x (Max Out Hz)
Negative P4�16=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�17) ± (P4�15) ] 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
P4.18 AI2 Filter
♦R/W 0412 41043
Range/Units (Format: 16-bit unsigned) Default
0�00~20�00 sec
0�01
This parameter sets a delay for Analog Input #2 to filter a noisy signal.
When the setting of P4.18 is too large, the reading of AI2 will be more stable but the control
response will be slower. When the setting of P4.18 is too small, the control response will be faster
but the control may be unstable due to a noisy AI2 reading. To find the optimal setting, adjust the
setting according to the desired amount of response vs signal accuracy.
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