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Commissioning (software)
2.8 Encoder Commissioning
Control Units CU240S
2-58 Operating Instructions (Compact), 04/2006, A5E00766042B AA
Caution
Once the correct parameters values have been entered, it is recommended to operate the
inverter in V/f mode (P1300 = 0) before speed/torque control with the encoder feedback is
used and check that it functions correctly.
The user must observe the motor shaft to check the direction of rotation.
The direction of rotation must be checked against the value displayed in r0061.
If the direction of rotation does not match, then the output phases of the inverter or the
encoder channels have to transposed to prevent unstable operation of the inverter in closed-
loop control mode.
Setting P1820 to 1 can be used to reverse the motor rotation without transposing the output
phases.
Ramp times (P1120 and 1121 cause F90 (encoder feedack loss).
Note
The encoder resolution (pulses per revolution) which may be entered will be limited by the
maximum pulse frequency of the encoder option port (f
max =
300 kHz ).
The following equation calculates the encoder frequency depending on the encoder
resolution and the rotational speed (rpm). The encoder frequency has to be less than the
maximum pulse frequency:
Example: An Encoder may have 1024 pulses per revolution. It rotates at n
N
= 2850 min
-1
.
This delivers f = 48,64 kHz < f
max
= 300 kHz, therefore the Encoder can be used with the
Encoder Interface.
P0492 is measured in Hz per milliseconds. If the inverter output frequency varies faster than
the maximum allowable change in output frequency, it will trip with a fault condition F0090.
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