
Program features 67
Post-magnetization
The function keeps the motor magnetized for a certain period after stopping. This is to
prevent the machinery from moving under load, for example before a mechanical
brake can be applied. Post-magnetization is activated by parameter
. The
magnetization current is set by parameter
Note:
Post-magnetization is only available when ramping is the selected stop mode.
Settings and diagnostics
Parameters
(page
) and
(page
Events: -
Pre-heating (Motor heating)
The pre-heating function keeps the motor warm and prevents condensation inside the
motor by feeding it with DC current when the drive has been stopped. The heating
can only be activated when the drive is in the stopped state, and starting the drive
stops the heating.
When pre-heating is activated and the stop command is given, pre-heating starts
immediately if the drive is running below the zero speed limit (see bit 0 in parameter
). If the drive is running above the zero speed limit,
pre-heating is delayed by the time defined by parameter
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 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 and diagnostics
(page
and
(page
ACS180 FW.book Page 67 Tuesday, March 9, 2021 2:25 PM