Control Structure In Flux With Motor Feedback; Internal Current Control; References; Local (Hand) And Remote (Auto) Control - GE AF-650 GP Design And Installation Manual

Application Setup Examples

6.3.4 Control Structure in Flux with Motor Feedback

Figure 6.7 Control Structure in Flux with Motor Feedback Configuration (only available in AF-650 GP)
In the configuration shown, H-41 Motor Control Principle is
set to [3] Flux w motor feedb and H-40 Configuration Mode
is set to [1] Speed closed-loop.
The motor control in this configuration relies on a
feedback signal from an encoder mounted directly on the
motor (set in H-42 Flux Motor Feedback Source).
Select [1] Speed closed-loop in H-40 Configuration Mode to
use the resulting reference as an input for the Speed PID
control. The Speed PID control parameters are located in
parameter group PI-0#.
Select [2] Torque in H-40 Configuration Mode to use the
resulting reference directly as a torque reference. Torque
control can only be selected in the Flux with motor
feedback (H-41 Motor Control Principle) configuration. When
this mode has been selected, the reference will use the
Nm unit. It requires no torque feedback, since the actual
torque is calculated on the basis of the current
measurement of the adjustable frequency drive.
Select [3] Process in H-40 Configuration Mode to use the
process PID control for closed-loop control of, e.g. speed
or a process variable in the controlled application.

6.3.5 Internal Current Control

The adjustable frequency drive features an integral current
limit control which is activated when the motor current,
and thus the torque, is higher than the torque limits set in
F-40 Torque Limiter (Driving), F-41 Torque Limiter (Braking)
and F-43 Current Limit.
TM
AF-650 GP Design and Installation Guide
When the adjustable frequency drive is at the current limit
during motor operation or regenerative operation, the
adjustable frequency drive will try to get below the preset
torque limits as quickly as possible without losing control
of the motor.

6.4 References

6.4.1 Local (Hand) and Remote (Auto)
Control
The adjustable frequency drive can be operated manually
via the keypad or remotely via analog and digital inputs
and serial bus. If allowed in K-40 [Hand] Button on Keypad,
K-41 [Off] Button on Keypad, K-42 [Auto] Button on Keypad,
and K-43 [Reset] Button on Keypad, it is possible to start and
stop the adjustable frequency drive via the keypad using
the [Hand] and [Off] keys. Alarms can be reset via the
[Reset] key. After pressing the [Hand] key, the adjustable
frequency drive goes into Hand mode and follows (as
default) the Local reference that can be set using arrow
key on the keypad.
After pressing the [Auto] key, the adjustable frequency
drive goes into Auto mode and follows (as default) the
Remote reference. In this mode, it is possible to control
the adjustable frequency drive via the digital inputs and
various serial interfaces (RS-485, USB, or an optional
network). See more about starting, stopping, changing
ramps and parameter setups, etc. in parameter group E-0#
(digital inputs) or parameter group O-5# (serial communi-
cation).
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