ABB ACS560 - Page 71

Program features 71
reference exceeds parameter 21.09 DC hold speed, normal drive operation
continues.
Settings
Parameters 21.08 DC current control and 21.09 DC hold speed
Post-magnetization
This function keeps the motor magnetized for a certain period (parameter 21.11 Post
magnetization time) 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 21.08 DC current control. The magnetization
current is set by parameter 21.10 DC current reference.
Note: Post-magnetization is only available when ramp stop is selected (see
parameter 21.03 Stop mode).
Settings
Parameters 21.03 Stop mode (page 210), 21.08 DC current control and 21.11 Pre-
heating input source.
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 on 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 zero speed (see bit 0 in parameter 06.19
Speed control status word). If the drive is running above zero speed, pre-heating is
delayed by 60 seconds to prevent excessive current.
Reference
Motor speed
DC hold
21.09 DC hold speed
t
t