Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 87)

Rockwell Automation Publication 7000-IN006B-EN-P - May 2013 83
Commissioning the Drive Chapter 5
3. Press EXIT [F10] to return to Parameters. Press [Enter] and scroll down
the list to Analog Outputs. Press [Enter] to see a similar list of available
ports and the assigned parameter number.
4. Scroll down to 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, and 10V representing the maximum value. These Scaling
parameters (i.e. Anlg Port2 Scle) can be used to change the scaling. (Refer
to the Installation or Technical Data Guides for more information on
programming parameters.)
5. Highlight the appropriate Analog Scale parameter and press [Enter]. Type
the new value, press [Enter] then 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.
Next, 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, use the meter
as a load.
2. Assign a parameter to the Analog Output port you are calibrating. This
parameter must be configurable from minimum to maximum for test
purposes only, for example: IDC Command Test. See previous page on
assigning an output.
3. Set IDC Command Test to 0.000 pu. This is the minimum. Adjust the
Zero adjustment screw on the isolator to read 4 mA.
4. Set IDC Command Test to 1.500 pu. This is the maximum. Adjust the
Span adjustment screw on the isolator to read 20 mA.
5. Repeat the process until you complete the adjustments.
6. Set IDC Command Test to 0.750 pu to ensure you read 12 mA (Half-
scale). Set IDC Command Test to 0.000 pu.
7. Assign the required parameter to the Analog Output port we have
calibrated.
8. Save all changes to NVRAM.
IMPORTANT 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.