Energy Optimization; Switching Frequency - ABB ACS580 Firmware Manual

108 Program features
can only be activated when the drive is in the stopped state, and starting the drive
stops the heating.
The heating is started 60 seconds after zero speed has been reached or modulation
has been stopped to prevent excessive current if coast stop is used.
The function can be defined to be always active when the drive is stopped or it can be
activated by a digital input, fieldbus, timed function or supervision function. For
example, with the help of signal supervision function, the heating can be activated by
a thermal measurement signal from the motor.
The pre-heating current fed to the motor can be defined as 0...30% of the nominal
motor current.
Notes:
• In applications where the motor keeps rotating for a long time after the modulation
is stopped, it is recommended to use ramp stop with pre-heating to prevent a
sudden pull at the rotor when the pre-heating is activated.
• The heating function requires that the STO circuit is closed or not triggered open.
• The heating function requires that the drive is not faulted.
• Pre-heating uses DC hold to produce current.
Settings
• Menu - Primary settings - Motor - Pre-heating
• Parameters 21.14 Pre-heating input source
188)
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Energy optimization

The function optimizes the motor flux so that total energy consumption and motor
noise level are reduced when the drive operates below the nominal load. The total
efficiency (motor and drive) can be improved by 1...20% depending on load torque
and speed.
Note: With a permanent magnet motor, energy optimization is always enabled.
Settings
• Menu - Energy efficiency
• Parameter 45.11 Energy optimizer
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Switching frequency

The drive has two switching frequencies: reference switching frequency and
minimum switching frequency. The drive tries to keep the highest allowed switching
frequency (= reference switching frequency) if thermally possible, and then adjusts
dynamically between the reference and minimum switching frequencies depending
on the drive temperature. When the drive reaches the minimum switching frequency
and 21.16 Pre-heating current
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