Rockwell Automation 1397 DC Drive Firmware 2.xx - Manual (Page 108)

4–36 Start–Up and Adjustment
Publication 1397-5.0 — June, 2001
!
ATTENTION: Current loop tuning applies power to
the motor armature and will rotate any coupled process
or load. Potentially fatal voltages may be present at
this time and danger of personal injury and/or
equipment damage may exist due to rotation of the
coupled equipment.
Speed loop auto tuning will tune the Drive speed regulator based on
values contained in the following parameters:
[Auto Tune Bridge] (P. 112) – Determines which bridge will be
used during the auto tune process. If this parameter is set to Reverse,
the reverse bridge is used, and the motor runs in the reverse direction
during the auto tune process. For non–regenerative Drives, this is
automatically set to Forward, and cannot be changed. For most
applications, satisfactory results are obtained when [Auto Tune
Bridge] is set to forward.
[Auto Tune Fld Rng] (P. 113) – Scales the auto tune results based
on the speed range that the Drive will operate when running the
process. The value of this parameter is the ratio of [Max Motor
Speed] to the motor’s base speed. For example, if the motor base
speed is 1750 RPM and [Max Motor Speed] is 2100 RPM, [Auto
Tune Fld Rng] should be set to 1.2. (i.e. 2100 RPM / 1750 RPM =
1,2). For applications where the motor runs less than 10% above
base speed, satisfactory results are obtained when [Auto Tune Fld
Rng] is set to a default of 1.00.
[Auto Tune Stablty] (P. 114) – Provides a simple means for the user
to adjust the performance of the speed loop without adjusting the
individual gains. The default value of 25 produces a speed loop
response which is satisfactory for most applications. If the user
desires a faster response, a value less than 25 may be used. If the
user desires a slower speed loop response (i.e. more stability), a
value greater than 25 may be used.
IMPORTANT: Prior to performing the autotune, the application
parameters whose values were previously lowered [Max Process
Speed] (P. 042), [Negative Current Lim ] (P. 068), [Pos Cur Lim
Src] (P. 069), [Pos Cur Lim] (P. 067), must be programmed for their
final value. Record the final values in Table 4.K.
Autotune Set–Up