Operating Mode - ABB ACS850 Firmware Manual

No. Name/Value
11.06 Dc hold
Disabled
Enabled
11.07 Autophasing mode
Turning
Standstill 1
Standstill 2
12

12 Operating mode

12.01 Ext1/Ext2 sel
DI1
Description
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
generating sinusoidal current and start to inject DC into the
motor. The current is set by parameter
When the reference speed exceeds parameter
speed, normal drive operation continues.
Motor speed
Reference
11.04 Dc hold
speed
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
• 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.
The DC hold function is disabled.
The DC hold function is enabled.
Selects the way autophasing is performed during the ID run.
See section Autophasing
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.
Faster than the Turning
will not rotate.
An alternative standstill autophasing mode that can be used if
the Turning mode cannot be used, and the
gives erratic results. However, this mode is considerably
slower than Standstill 1.
Operating mode and external reference source selection.
Selects the source for external control location EXT1/EXT2
selection.
Digital input DI1 (as indicated by
speed, the drive will stop
11.05 Dc hold curr
11.04 Dc hold
DC hold
is set to Scalar.
on page 30.
mode, but not as accurate. The motor
Standstill 1
02.01 DI status, bit 0).
Parameters 87
FbEq
ref.
t
t
0
1
0
1
2
mode
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