Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 233)

Commissioning 4-59
7000 “A” Frame 7000A-UM150F-EN-P – June 2013
– Set the utilized Reference Command minimum (L, R and D)
to the desired value. The minimum reference command input
setting on a drive without a tachometer is 6 Hz. Without
tachometer control, do not set the reference command
minimum parameter below 6 Hz. A control with tachometer
feedback will allow a minimum speed of 1 Hz. With
tachometer control, do not set the reference command
minimum parameter below 1 Hz.
– Set the utilized Reference command (L, R and D) Maximum
parameters so that with full reference command inputs, the
associated Reference command Variables read the desired
maximum value.
– The various reference command maximums usually have to
be increased above the desired maximum value to
compensate for the loading down of their 10 volt input rails
by the attached potentiometer or isolator.
Example:
The customer 4-20mA speed input is coming to the Current Loop
Receiver on the Customer Interface Board, and they want the
maximum input to represent 60 Hz.
1. Reference Command Remote Maximum (Ref Cmd R Max)
should be set for 60 Hz.
2. The Reference Select parameter should be set to „Remote 4-20a‟.
3. Have the source supply 20mA to the drive. This should be
verified with a multimeter connected in series with the current
source. Ensure that you are in Remote mode with the selector
switch, and look at the parameter Speed Command In, which
will represent that 20mA signal.
4. Ensure that it reads 60 Hz. If it does not, you can increase the
Ref Cmd R Max value until this parameter reads 60 Hz.
• Digital Reference command Input Scaling
The maximum value for a digital reference command is 32767;
the minimum value is 0. Values that are negative or out of
bounds will result in the drive slowing down to minimum speed.