vacon • 142
Parameters
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The automatic motor identification calculates or measures the motor parameters that are needed
for optimum motor and speed control.
Identification Run is a part of tuning the motor and the drive specific parameters. It is a tool for com-
missioning and service of the drive with the aim to find as good parameter values as possible for
most drives.
The automatic identification is activated by setting this parameter to desired value and giving a start
command in the requested direction. The start command to the drive has to be given within 20 s. If
no start command is given within this time the identification run is cancelled, the parameter will be
reset to its default setting and an
Identification
alarm will be launched.
The identification run can be stopped at any time with normal stop command and the parameter is
reset to its default setting. An
Identification
alarm will be launched if the identification run has
failed.
NOTE:
New start command (Rising edge) is required to start the drive after identification.
This function is typically used if there is a switch between the drive and the motor. Such switches
are often found in residential and industrial applications to make sure that an electrical circuit can
be completely de-energized from the motor for service or maintenance.
When this parameter is enabled and the motor switch is opened to disconnect the running motor,
the drive detects the loss of motor without tripping. It is not necessary to make any changes in the
run command or the reference signal to the drive from the process control station. When the motor
is re-connected after completed maintenance by closing the switch, the drive detects the motor
connection and runs the motor to the reference speed as per the process commands.
If the motor is rotating when re-connected, the drive detects the speed of the running motor
through its
Flying start
feature and then controls it to desired speed as per the process commands.
Table 131.
Selection
number
Selection name
Description
0
No action
No identification requested.
1
Identification at
standstill
The drive is run without speed to identify the motor parameters. The
motor is supplied with current and voltage but with zero frequency. U/f
ratio is identified.
2
Identification with
motor rotating
The drive is run with speed to identify the motor parameters. U/f ratio
and magnetization current are identified.
NOTE:
This identification run must be performed with no load on the
motor shaft for accurate results.
