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Program features 61
Bit 4 of
indicates if the rotor position has already been
determined.
Autophasing modes
Several autophasing modes are available (see parameter
).
The turning mode (
) is recommended especially with case 1 (see the list
above) as it is the most robust and accurate method. In turning mode, the motor shaft
is turned back and forward (±360/polepairs)° in order to determine the rotor position.
In case 3 (open-loop control), the shaft is turned only in one direction and the angle is
smaller.
, can be used if there is difficulty using the
normal turning mode, for example, because of significant friction. With this mode, the
rotor is turned slowly until a zero pulse is detected from the encoder. When the zero
pulse is detected for the first time, its position is stored into parameter
, which can be edited for fine-tuning. Note that it is not mandatory to use
this mode with a zero pulse encoder. In open-loop control, the two turning modes are
identical.
The standstill modes (
) can be used if the motor cannot be
turned (for example, when the load is connected). As the characteristics of motors
and loads differ, testing must be done to find out the most suitable standstill mode.
The drive is capable of determining the rotor position when started into a running
motor in open-loop or closed-loop control. In this situation, the setting of
has no effect.
The autophasing routine can fail and therefore it is recommended to perform the
routine several times and check the value of parameter
.
An autophasing fault (
) can occur with a running motor if the
estimated angle of the motor differs too much from the measured angle. This could
be caused by, for example, the following:
• The encoder is slipping on the motor shaft
• An incorrect value has been entered into
• The motor is already turning before the autophasing routine is started
•
mode is selected in
but the motor shaft is
locked
•
mode is selected in
but no zero
pulse is detected within a revolution of the motor
• The wrong motor type is selected in
• Motor ID run has failed.
Settings and diagnostics
Parameters
(page
(page
),
(page
).
Summary of Contents for ACS880-x04
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Page 4: ......
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 112: ...112 Application macros ...
Page 496: ...496 Additional parameter data ...
Page 544: ...544 Fault tracing ...
Page 602: ...602 Control chain diagrams ...