Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 230)

230 Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
Chapter 4 Commissioning
If you scroll down, you will reach the scaling factors for the 4 Meter Port and the
3 ACB Port outputs. All parameters are scaled to 0-10V, with 0 representing the
minimum value given in Chapter 5 under Parameter Descriptions, and 10V
representing the maximum value given in Chapter 5. These Scaling parameters
(i.e. Anlg Port2 Scle) can be used to change the scaling.
Highlight the appropriate Analog Scale parameter and press Enter. You can enter
your new value, and then press Enter, and EXIT [F10]. Ensure you save to
NVRAM when you are finished.
The analog outputs from the customer interface boards are stated as 0 to 10 volts,
but in actual fact their outputs are typically 0.025 to 9.8 or 9.9 V. This is due to
the rails being loaded down by an attached speed potentiometer or signal
conditioner impedance. Incorporated signal conditioners usually have 0 to 10-
volt inputs and 4 to 20 mA outputs. An additional error is incorporated in the
signal conditioners, so if they are calibrated for 0 to 10 volts input, there will not
be exactly 4 to 20 mA out.
It is now necessary to calibrate the external 4 to 20 mA signal conditioners.
1. Set a digital multimeter to mA and place it in line with the signal
conditioners. If the output of the conditioner is terminated, the meter can
be used as a load.
TIP There are certain parameters whose minimum value is a negative number. In
that case, the minimum value of the parameter (-10V) is scaled to 0V output,
and the maximum value is scaled to 10V output.