The current position after Start Positioning of Axle 37 is recognized by the frequency
inverter as follows:
−
During commissioning, after switching on the frequency inverter, a search mode
is performed for 3 rotations at a rotational frequency of 1 Hz in order to detect
the reference signal. As soon as the reference signal was recognized twice, the
drive is positioned to the Reference orientation 469.
When using a Resolver, the search mode during commissioning is skipped.
− If the motor was already rotating before axle positioning was enabled, the posi-
tioning to the
Reference orientation 469 is performed without search mode be-
cause the position of the reference point was already detected by the frequency
inverter.
If the positioning is carried out, after controller enabling and start command, when
the motor is at a standstill:
− The motor is positioned clockwise to the reference orientation if the value for the
reference orientation is higher than the value adjusted before.
− The motor is positioned anticlockwise to the reference orientation if the value for
the reference orientation is smaller than the value adjusted before.
The sense of rotation during the positioning is independent of whether Start Clock-
wise or Start Anticlockwise was activated.
The time required until the reference orientation is reached depends on:
− Actual frequency
− Frequency ramp for deceleration
− Rotational angle to reference orientation
− Max. positional error
− Time constant positioning contr.
13 Error and warning behavior
Operation of the frequency inverter and the connected load are monitored continu-
ously. The
monitoring functions are to be parameterized with the corresponding limit
values specific to the application. If the limits were set below the switch-
the frequency inverter, a fault switch-
off can be prevented by suitable measures if a
warning message is issued.
The warning message is displayed by the LED's and can be read out on the oper
ating
unit via parameter Warnings 269 or output via one of the digital control outputs.
06/13 Operating Instructions ACU 149
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