104 EM-ABS-01 for ACU 03/12
− The motor turns and accelerates until it reaches the Frequency Switch-Of
limit
417:
• Check the encoder lines and check the encoder connection contacts.
• In the case of fault messa
e “Overfrequency” F1100: increase the paramete
value for Offset 1188 by 180°, divided by the no. of motor pole pairs.
− If the motor turns at the ad
usted speed and in the ri
ht direction, carr
out the fine adjustment of the offset:
• Adjust the parameter value for Offset 1188 in small steps (e.g. 2.5°) until the
Flux-Forming Voltage 235 is roughly 0.
−
In case the flux-forming voltage deviates from 0 significantly, adjust the offset
in bigger steps.
−
In the case of a positive flux-forming voltage, increase the offset.
− In the case of a negative flux-forming voltage, reduce the offset.
• Adjust parameters Frequency Switch-Off limit 417 and Current Limit 728 to
the required values.
• Repeat the fine adjustment of the offset at 50 % of the rated frequency.
This completes the offset adjustment.
• Start the guided commissioning. This is required for optimum current control.
Attention! Some absolute value encoder types enable to “zero” or change the posi-
tion transmitted by the encoder. Do not use this function, as this will
change the commutation angle for
Offset 1188 and correct speed control
is not guaranteed.
8.4.7 Bits/Turn
If an absolute value encoder is used (EnDat 2.1, Hiperface, SSI), the number o
Bits/Turn (referred to encoder) must be configured in the frequency inverter. In the
case of Hiperface and SSI encoders, the value specified in the data sheet of the encod-
er used must be entered in parameter
Bits/Turn 1271.
In the case of EnDat 2.1, the value is read automatically from the EnDat encoder and
used internally. Parameter
Bits/Turn 1271 is not evaluated in the case of EnDat en-
coders.
To Next Page
Loading...
Need help?
General
