Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 196)

Chapter 7
Programming Parameters
7-30
Parameter 156 – Tach Velocity [Tach Velocity]
Internal units : 4096 = 1000h = 1 pu = base motor speed
Programming Terminal units: RPM
Description : This word supplies a motor velocity feedback signal
when an analog tachometer is used. This input will typically be linked
to an analog input parameter from the Discrete Adapter Board. The
analog scaling for the adapter should be set up so that a value of 4096
in this parameter represents base motor speed.
When Tach Velocity is used for velocity feedback, a value of “2”
must be entered in Feedback Device Type ( Parameter 621).
Parameter 157 – Torque Reference [Torque Reference]
Internal units : 4096 = 1000h = 1 pu = 100% rated motor torque
Programming Terminal units: Percent rated motor torque
Description : This word supplies an external motor torque reference
to the Drive. The external torque reference can be selected by setting
Torque Mode (Parameter 625) to a value of “2”. The external torque
reference can also be modified by summing the Process Trim output
when the Process Trim Select (Parameter 628) contains a value of
“2”.
The external torque reference input is also used when either the
“minimum” or “maximum” torque modes are selected (Parameter
625). These functions automatically make a selection between the
external torque reference value and the output of the velocity speed
regulator.
The external torque reference input should be scaled so that a value of
4096 represents 100% rated motor torque. This is the torque that the
motor would produce when operating at rated armature current and
rated field current.
Parameter 159 – Flux Feed Forward [Flux Feed Fwd]
Internal units : 4096 = 1000h = 1 pu = 100% motor field flux
Programming Terminal units: Percent of full motor field flux.
Description : This word supplies an external flux reference to the
Drive. The drive will use this input when the External Feed Forward
Enable Bit is set in Flux Mode Select (Parameter 627).
This input could be used to bypass the flux calculation in the flux
control software. The flux calculation produces a flux command that
is inversely proportional to speed when motor speeds are above the
Minimum Field Regulate Speed.