ABB ACSM1 Firmware Manual page 96

96
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
HOLD
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.
Bit pointer: Group and index and bit
(0) Disabled
(1) Enabled
11.07 AUTOPHASING MODE
Selects the way the autophasing routine is performed. See also section
(0) Turning
(1) Standstill 1
(2) Standstill 2
Parameters and firmware blocks
FW block:
11.05 DC HOLD CUR
SPEED, normal drive operation continues.
Motor speed
Reference
DC hold function disabled.
DC hold function enabled.
FW block:
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
and the start-up is not time-critical. Note: This mode will cause the
motor to rotate during the motor ID run.
Faster than the
not rotate.
An alternative standstill autophasing mode that can be used if the
TURNING mode cannot be used, and the
erratic results. However, this mode is considerably slower than
Standstill
START/STOP MODE
REF. When the reference speed exceeds parameter
DC Hold
99.05 MOTOR CTRL MODE
START/STOP MODE
(0) Turning mode, but not as accurate. The motor will
1.
(see above)
11.04 DC HOLD
t
t
is set to (1)
(see above)
Autophasing on page 39.
(1) Standstill 1 mode gives
SPEED,
11.04 DC
Scalar.
(1)