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Program features 117
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
and
(page
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 permanent magnet and synchronous reluctance motors, energy
optimization is always enabled.
Settings
•
Menu - Energy efficiency
(page
)
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.
ACS580 FW.book Page 117 Wednesday, September 21, 2016 9:48 PM
Содержание ACS580 Series
Страница 88: ...84 ACS580 FW book Page 84 Wednesday September 21 2016 9 48 PM ...
Страница 146: ...142 Program features ACS580 FW book Page 142 Wednesday September 21 2016 9 48 PM ...
Страница 444: ...440 Fieldbus control through a fieldbus adapter ACS580 FW book Page 440 Wednesday September 21 2016 9 48 PM ...
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