ABB ACS850 - Operating Mode

Parameters 133
11.06 Dc hold Enables the DC hold function. The function makes it possible
to lock the rotor at zero speed.
When both the reference and the speed drop below the value
of parameter 11.04 Dc hold speed, the drive will stop
generating sinusoidal current and start to inject DC into the
motor. The current is set by parameter 11.05 Dc hold curr ref.
When the reference speed exceeds parameter 11.04 Dc hold
speed, normal drive operation continues.
Notes:
• The DC hold function has no effect if the start signal is
switched off.
• The DC hold function can only be activated in speed
control mode.
• The DC hold function cannot be activated if parameter
99.05 Motor ctrl mode is set to Scalar.
• Injecting DC current into the motor causes the motor to
heat up. In applications where long DC hold times are
required, externally ventilated motors should be used. If
the DC hold period is long, the DC hold cannot prevent the
motor shaft from rotating if a constant load is applied to the
motor.
Disabled The DC hold function is disabled. 0
Enabled The DC hold function is enabled. 1
11.07 Autophasing mode Selects the way autophasing is performed during the ID run.
See section Autophasing on page 67.
Turning This mode gives the most accurate autophasing result. This
mode can be used, and is recommended, if it is allowed for
the motor to rotate during the ID run and the start-up is not
time-critical.
Note: This mode will cause the motor to rotate during the ID
run.
0
Standstill 1 Faster than the Turning mode, but not as accurate. The motor
will not rotate.
1
Standstill 2 An alternative standstill autophasing mode that can be used if
the Turning mode cannot be used, and the Standstill 1 mode
gives erratic results. However, this mode is considerably
slower than Standstill 1.
2
12
12 Operating mode
Selection of external control location and operating modes.
12.01 Ext1/Ext2 sel Selects the source for external control location EXT1/EXT2
selection.
0 = EXT1
1 = EXT2
No. Name/Value Description FbEq
Reference
Motor speed
DC hold
11.04 Dc hold
speed
t
t