vacon • 115 Parameters
6
P3.1.2.4 IDENTIFICATION
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
commissioning and service of the drive with the aim to find as good parameter values as pos-
sible 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 parame-
ter 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.
P3.1.2.6 M
OTOR SWITCH
This function is typically used if there is a switch between the drive and the motor. Such switch-
es are often found in residential and industrial applications to make sure that an electrical cir-
cuit 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 mo-
tor, 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 de-
tects the motor connection and runs the motor to the reference speed as per the process com-
mands.
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 com-
mands.
Table 111.
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 fre-
quency. 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.
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