102 EM-ABS-01 for ACU 03/12
8.4.5 Speed filter
ia parameter Abs. Encoder: Filter time constant 1189, you can filter hi
h frequenc
of the encoder signals and limit the control band width.
Parameters Settings
No. Description Min. Max. Factory set-
ting
1189 Abs. Encoder: Filter time constant 125 µs 8000 µs 125 µs
8.4.6 Offset
In order to enable the start of a synchronous machine, the absolute position of the
rotor must be known. This information is required in order to actuate the stator wind-
ings in the right order depending on the position of the rotor. The position of the rotar
field in the synchronous machine must be controlled in order to obtain a continuous
movement of the rotor. Durin
first commissionin
, the position of the rotor windin
o
the encoder is adjusted to the rotor displacement an
le of the synchronous motor b
ad
ustin
the offset. For operatin
a synchronous machine with encoder, the offse
must be adjusted in order to obtain perfectly true running and a maximum torque.
The correct
Offset 1188 is adjusted when the Flux-forming voltage 235 is rou
hly the
same in both directions when the motor is turnin
and comes as close as possible to
the value 0. Also note the fine setup instructions at the end of this chapter.
Parameters Settings
No. Description Min. Max. Factory set-
ting
1188 Offset -360,0° 360,0° 0,0°
The offset can be determined and adjusted as follows:
• Durin
first commissionin
“SEtUP” will be displayed in the control unit. Press
ESC to stop this operation. The guided commissionin
(“SETUP”) is performed
after adjusting the offset.
• Open the parameter menu “PARA” and enter the machine data indicated on
the type plate or the data sheet of the motor.
Before adjusting the offset, take the following safety precautions:
• Turn of release of the frequency inverter via the digital inputs for controller re-
lease.
• If possible, uncouple the motor from the load so that the motor shaft turns
freely. If installed, release the mechanical brake.
If uncoupling is not possible, make sure that the motor is loaded as little as possi-
ble.
Warning! In certain circumstances, the motor speed may reach hi
h values. If the
motor is not uncoupled from the load, personal and material dama
e ma
result. To avoid such damage, make the following settings in any case.
• Set the max. permissible output frequency of the frequency inverter to a low
frequency value via parameter
Shutdown limit frequency 417. Select the fre-
quency value such that uncontrolled acceleration of the motor ("overspeedin
")
is detected at an early stage. This limitation is necessary in order to avoid per-
sonal and material damage.
To Next Page
Loading...
Need help?
General
