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
, 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 parameter
is set to
• 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
on page
.
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
mode, but not as accurate. The motor
will not rotate.
1
Standstill 2
An alternative standstill autophasing mode that can be used if
the
mode
gives erratic results. However, this mode is considerably
slower than
.
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
t
t
Summary of Contents for ACS850 series
Page 1: ...ACS850 Firmware Manual ACS850 Standard Control Program ...
Page 4: ......
Page 56: ...56 Control locations and operating modes ...
Page 262: ...262 Parameters ...
Page 310: ...310 Fault tracing ...
Page 348: ...348 Control through a fieldbus adapter ...
Page 358: ...358 Drive to drive link ...