Program features 79
pre-heating is delayed by the time defined by parameter
21.15
Pre-heating time delay
to prevent excessive current.
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 STO is not triggered.
• The heating function requires that the drive is not faulted.
• Pre-heating uses DC hold to produce current.
Settings
Parameters
21.14
Pre-heating input source
(page
174
),
21.15
Pre-heating time delay
and
21.16
Pre-heating current
(page
174
).
Energy optimization
The Energy optimization 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 and synchronous reluctance motor, energy
optimization is always enabled.
Settings
Parameter
45.11
Energy optimizer
(page
286
).
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
(= lowest allowed switching frequency), it starts to limit output current as the heating
up continues.
For derating, see the hardware manual of the drive.
ACS380 FW.book Page 79 Friday, May 4, 2018 4:18 PM
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