Selection
number
Selection name Description
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.
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.
New start command (Rising edge) is
required to start the drive after
identification.
P3.1.2.6 Motor switch
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.
TM078690
Motor switch
Pos. Description
1 Mains
2 Motor switch
3 Motor
P3.1.2.7 Load drooping
The drooping function enables speed drop as a
function of load. This parameter sets that amount
corresponding to the nominal torque of the motor.
128
English (GB)
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