Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 221)

COMMISSIONING 9-21
1557-UM050F-EN-P – June 2013
To calculate the scale factor for the meter, take the meter full scale over the drive analog output scaling as
seen below.
Scale Factor =
Analog Output Scale
Meter Scale
See the parameter and variable description in Chapter 6 for more information. For example, a 0 to 5000 RPM
meter would have a scale factor of
Speed Scale Factor =
4096
5000
= .8192
It will be necessary to verify other information regarding the drive.
From the converter screen, check the following entries:
a. The number of series and redundant devices in each leg.
b. The CT ratios (LINE and MACHINE).
c. Burden resistor values.
d. Pulse number (6 or 12). It is extremely important that this is
correct, as the drive will configure itself differently in each case.
Call a Rockwell Automation Global Technical representative for
assistance if you are unsure.
If the drive has a tachometer, it must also be set up. To setup the tachometer, go to the OPTIONS group of the
parameter screen. Enter the tachometer type and the pulses per revolution.