Vacon 100 Industrial Applications Manual page 200

VACON · 200 PARAMETER DESCRIPTIONS
The magnetising current (no-load current) of the motor identifies the values of the U/f
parameters if they are given before the identification run. If the value is set to 0, the
magnetising current is calculated internally.
P3.1.2.6 MOTOR SWITCH (ID 653)
Use this parameter to enable the Motor Switch function.
You can use the Motor Switch function, if the cable that connects the motor and the drive has
a motor switch. The operation of the motor switch makes sure that the motor is isolated
from the voltage source and does not start during the servicing.
To activate the function, set the parameter P3.1.2.6 to the value Enabled. The drive stops
automatically when the motor switch is opened, and the drive starts automatically when the
motor switch is closed. The drive does not trip when you use the Motor switch function.
B
0 1
A
Fig. 20: The motor switch between the drive and the motor
A. The motor switch B. Mains
P3.1.2.7 LOAD DROOPING (ID 620)
Use this parameter to enable the Load Drooping function.
The Load drooping function enables a speed drop as a function of load. You can use this
function when a balanced load is necessary for mechanically connected motors. This is
called static drooping. You can also use the function when a dynamic drooping is necessary
because the load changes. In static drooping, the Load Drooping Time is set to 0, so that the
drooping cannot decay. In dynamic drooping, the Load Drooping Time is set. The load is
momentarily drooped with energy from the system inertia. This decreases the current torque
spikes when the load changes suddenly.
If the motor has a nominal frequency of 50 Hz, the motor is loaded with the nominal load
(100% of the torque), and Load Drooping is set to 10%, the output frequency is let to decrease
5 Hz from the frequency reference.
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