
■
DC magnetization
DC magnetization can be applied to the motor to
•
heat the motor to remove or prevent condensation, or
•
to lock the rotor at, or near, zero speed.
Pre-heating
A motor pre-heating function is available to prevent condensation in a stopped
motor, or to remove condensation from the motor before start. Pre-heating involves
feeding a DC current into the motor to heat up the windings.
Pre-heating is deactivated at start, or when one of the other DC magnetization
functions is activated. With the drive stopped, pre-heating is disabled by the safe
torque off function, a drive fault state, or the process PID sleep function.
Pre-heating can only start after one minute has elapsed from stopping the drive.
A digital source to control pre-heating is selected by parameter
. The heating
current is set by
Pre-magnetization
Pre-magnetization refers to DC magnetization of the motor before start. Depending
on the selected start mode (
or
), premagnetization can be applied to
guarantee the highest possible breakaway torque, up to 200% of the nominal
torque of the motor. By adjusting the pre-magnetization time (
), it is possible
to synchronize the motor start and, for example, the release of a mechanical brake.
DC hold
The function makes it possible to lock the rotor at (near) zero speed in the middle
of normal operation. DC hold is activated by parameter
. When both the
reference and motor speed drop below a certain level (parameter
), the drive
will stop generating sinusoidal current and start to inject DC into the motor. The
current is set by parameter
. When the reference exceeds parameter
normal drive operation continues.
Program features 93
Содержание ACS880 N5700 Series
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