Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 - Manual (Page 51)

Chapter 3
Functional Description
3-18
Field Flux Tuning The Field Flux Tuning function calculates the field current values required
to obtain specific field flux levels and calibrates the flux parameters
accordingly. Field Flux Tuning is not performed if Armature Voltage
Feedback is used as the feedback device type (Parameter 621).
It also calculates the rated field current and adjusts the Rated Field Current
(Parameter 612) as required.
The field flux tuning function does not control the motor speed directly.
This is done to allow the function to calibrate the drive regardless of the
drive regulator type. For example, speed regulated, torque regulated or
torque follower drives can all be calibrated with this feature.
In order to calibrate the field flux properly, the actual motor speed must
match the value specified in Parameter 699. Also, best results are obtained
if the motor is run at base speed. Gains must also be entered for KI Flux
(677) and KP Flux (673). The defaults are recommended.
Trending The 1395 has four internal trend buffers which can be programmed to
monitor select fast parameters. These buffers are particularly useful during
the commissioning of the drive. They can be used to monitor motor status,
logic command or other important information.
Each trend has the following features:
•
The parameter to be trended can be specified.
•
The parameter number (operand X) whose value will be monitored for a
trigger condition can be specified. The parameter number (operand Y),
whose value will be compared against the monitored parameter to
determine if a trigger should occur, can be specified.
•
The operator used to determine what condition(s) will cause a trigger is
established.
•
The rate at which the chosen parameter is selected is changeable.
•
The number of samples taken after the trigger has occurred is
changeable.
•
Each trend can be setup as one shot or multiple occurrence. When
setup as one shot, the trend has to be enabled after each trigger
occurrence. When setup as multiple occurrence, the trend buffer will
restart immediately after the trend data has been sent to the output
buffer.
•
Each trend can be deactivated so that it does not monitor for a trigger
occurrence.
•
Each trend output buffer can be linked to an external device. The rate at
which the sampled data is transferred to the external device is also
adjustable. This feature requires that the trends be set as “one-shot”.
•
Trend buffers can be triggered from other trend buffers. This gives you
the capability of recording up to 400 consecutive data samples for a
given parameter.