Parameters and firmware blocks
81
11.06
DC HOLD
(see above)
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
. When the reference speed exceeds parameter
, 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 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
DC hold function disabled.
(1)
ENABLED
DC hold function enabled.
11.07
AUTOPHASING MODE
(see above)
Selects the way autophasing is performed during the ID run. See also section
on page
.
(0)
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.
(1)
STANDSTILL 1
Faster than the
mode, but not as accurate. The motor
will not rotate.
(2)
STANDSTILL 2
An alternative standstill autophasing mode that can be used if the
TURNING mode cannot be used, and the
mode
gives erratic results. However, this mode is considerably slower than
t
t
DC Hold
Motor speed
Reference
Summary of Contents for ACSM1 Series
Page 1: ...ACSM1 Firmware Manual ACSM1 Speed and Torque Control Program...
Page 2: ......
Page 4: ......
Page 12: ...Table of contents 12...
Page 49: ...Drive control and features 49...
Page 282: ...Standard function blocks 282...
Page 306: ...Application program template 306...
Page 312: ...Control chain block diagrams 312...
Page 331: ...331...
Page 332: ...332...
Page 333: ......