Rockwell Automation RELIANCE ELECTRIC SP500 - Page 78

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:
Desired Maximum Reference (MA) x 199 - % gain (mA reference)
Reference Range (20)
Example
If the remote speed reference is 0 to 20 mA and the maximum reference required is
19.2 mA, scale as follows:
19.2
30" x 100 = 96% gain
To calculate the scaled reference if you are using a 0 to 10 VDC remote reference,
use the following equation:
Desired Maximum Reference (VDC) y 499 — % gain (VDC reference)
Reference Range (10)
Example
If the remote speed reference is 0 to 10VDC and the maximum reference required is
9.5 VDC, scale as follows:
9.5 _ ge, cai
10 x 100 = 95% gain
F-12 Remote Reference Offset
This parameter scales Parameter Range: 0% to 40% of full scale minimum reference
the remote speed
reference (0 to 10VD
or 0 to 20 mA) toa
minimum value.
C Default Setting: 0%
Step Size: 0.10%
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:
Desired Minimum Speed Offset_ , 499 ~ % offset
Reference Range
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:
4 _ ono
30 x 100 = 20% offset
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:
a4 x 100 = 4% offset
8-10
SP500 AC Drive Installation and Operation Manual Version 3.1