Refer to LC34 Digital Pre-torque, pg. 170 for additional
information.
When US04 = Serial Speed DIN66019 Serv. 49 (4) , Serial
Speed DIN66019 Serv. 50 (5), the pre-torque value is set via
FB03 Field Bus Pre-torque.
Refer to Field Bus Parameters (FB), pg. 223 for additional
information on FB03 Field Bus Pretorque.
Closed-loop operation with field-oriented control and internal
predictive synthetic pre-torque, using 90% of the torque
from the previous run to eliminate rollback without use of
load weigher.
When using induction motors, the drive may be run open loop on inspection to
verify whether the encoder functions normally. By setting the parameter LC01
Motor Control = Open Loop V/Hz, (0) the inverter runs the motor open loop. The
encoder feedback (motor speed) is displayed in Diagnostics Screen #2 or
parameter DG07 Motor Speed, but has no effect on the operation of the motor.
Therefore, this mode can be used to verify whether the encoder is functioning
properly. Generally, when running empty car up the actual motor speed should be
equal to the set speed. If these values are off by more than 20 rpm when running
empty car up, there is most likely an encoder or encoder cable problem.
Running an induction motor in open loop can also be used to rule out any
mechanical issues when troubleshooting due to encoder feedback, motor data
settings, and speed control settings. The only parameter available for adjustment
in open loop V/Hz mode is LC32 Low Speed Torque Boost.
Risk of high motor currents and/or poor performance!
Running V/Hz mode at high speed or leveling speed can result in high
motor currents and or poor performance. Always verify that this
parameter is set correctly before running in automatic mode!
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