Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 - Manual (Page 149)

Chapter 5
Programming Parameters
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Parameter 702 – Velocity Damping Factor [Vel Damp Factor]
Internal units : None
Programming Terminal units: None
Minimum Value: 0.5
Maximum Value: 3.0
Default Value: 1.0
Description: This parameter (along with Parameter 700) determines
the dynamic behavior of the velocity loop. The damping factor
influences the amount of overshoot the velocity loop will exhibit
during a transient. The velocity will typically exhibit more overshoot
and become oscillatory (underdamped) as the damping factor is
reduced below 1. For a damping factor above 1, the velocity loop
should not exhibit much overshoot and have a slower rise time for a
given velocity loop bandwidth.
Parameter 703 – System Inertia [System Inertia]
Internal units : Secs x 100
Programming Terminal units: SECS
Minimum Value: 0.01
Maximum Value: 655.0
Default Value: 2.0
Description: This parameter represents the time, in seconds, for a
motor coupled to a load, to accelerate from zero to base speed at rated
armature and field current. This parameter is calculated by the auto
tune velocity system.
Parameter 704 – At Speed 1 [At Speed 1]
Internal units : 4096 = 1000h = 1 pu = base motor speed
Programming Terminal units: RPM
Minimum Value: –6 x base speed
Maximum Value: +6 x base speed
Default Value: 0 rpm
Description: This parameter specifies a setpoint for determining
when the motor has reached a given speed. When the motor feedback
speed is within the Up to Speed Tolerance (Parm 709) from the AT
SPEED 1 setpoint, then the AT SPEED 1 output bit in the Logic
Status ( Parm 100) will be set to 1. Up to speed tolerance sets
hysteresis for the At Speed 1 output.