ABB ACSM1 Firmware Manual page 81

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
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 CUR
HOLD SPEED, normal drive operation continues.
Motor speed
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 par.
• 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.
(0) DISABLED
(1) ENABLED
11.07 AUTOPHASING MODE
Selects the way autophasing is performed during the ID run. See also section
37.
(0) TURNING
(1) STANDSTILL 1
(2) STANDSTILL 2
FW block: START/STOP MODE
REF. When the reference speed exceeds parameter
Reference
DC hold function disabled.
DC hold function enabled.
FW block: START/STOP MODE
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
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
(1) STANDSTILL
(see above)
DC Hold
99.05 MOTOR CTRL MODE
(see above)
(0) TURNING mode, but not as accurate. The motor
1.
Parameters and firmware blocks
11.04 DC HOLD SPEED,
11.04 DC
t
t
is set to (1) SCALAR.
Autophasing on page
(1) STANDSTILL 1 mode
81