8-10
SP500 AC Drive Installation and Operation Manual Version 3.1
F-11 Remote Reference Gain
(continued)
To calculate the scaled reference if you are using a 0 to 20 mA remote reference,
use the following equation:
To calculate the scaled reference if you are using a 0 to 10 VDC remote reference,
use the following equation:
:
Typically, the value of the minimum speed reference (the amount of reference at
minimum speed, F-03) is either 0 VDC or 0 mA. Enter the parameter value as a
percentage of the full scale reference to be offset from minimum speed.
To calculate the scaled minimum reference, use the following equation:
Example
If the remote speed reference is 0 to 20 mA and the maximum reference required is
19.2 mA, scale as follows:
Example
If the remote speed reference is 0 to 10VDC and the maximum reference required is
9.5 VDC, scale as follows:
Desired Maximum Reference (mA)
Reference Range (20)
x 100 = % gain (mA reference)
19.2
20
x 100 = 96% gain
Desired Maximum Reference (VDC)
Reference Range (10)
x 100 = % gain (VDC reference)
9.5
10
x 100 = 95% gain
F-12 Remote Reference Offset
This parameter scales
the remote speed
reference (0 to 10VDC
or 0 to 20 mA) to a
minimum value.
Parameter Range:
Default Setting:
Step Size:
0% to 40% of full scale minimum reference
0%
0.10%
Scaling Examples
Example 1: If the remote analog input speed reference is 0 to 20 mA (J6 set on
terminals 2 and 3), and the available analog reference signal is 4 to 20 mA, use
F-12 to obtain minimum speed with minimum analog input as follows:
Example 2: If the remote analog input speed reference is 0 to 10 VDC (J6 set on
terminals 1 and 2), and the available signal is offset 0.4 VDC, use F-12 to obtain
minimum speed with minimum analog input as follows:
Desired Minimum Speed Offset
Reference Range
x 100 = % offset
4
20
x 100 = 20% offset
x 100 = 4% offset
0.4
10
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