4.4.2 Safety measures before self-configuration of resolver offset
WARNING
Risk of personal and machine damage
In certain circumstances, the motor speed may reach high values.
• Before adjusting the resolver offset disconnect the motor from the load.
• To avoid damage, make the following settings.
• Turn off frequency inverter release via the digital inputs for controller release.
• If possible, uncouple the motor from the load so that the motor shaft turns freely.
• If uncoupling is not possible, make sure that the motor is loaded as little as possible.
• If installed, release the mechanical brake.
• Set the max. permissible output frequency of the frequency inverter to a low frequency value via
parameter
Switch-Off Limit 417. Select the frequency value such that uncontrolled acceleration
of the motor (“overspeeding”) is detected at an early stage. This limitation is necessary in order to
avoid personal and material damage.
Frequency Switch-off Limit
• Set parameter
Current Limit 728 of the speed controller to a low current value (e.g. 10% of the
rated motor current). In this way it is made sure that there are no excessive currents if the offset
is set incorrectly.
o: Overload factor, I
FIN:
rated current
4.4.3 Adjustment Parameter 383
In the self-setup, Parameter Voltage Constant 383 is changed only if it set to the value 0.0.
Non-zero values are interpreted as optimized setting.
The voltage constant is determined from the rated voltage, the measured inductance and the
measured stator resistance.
The voltage constant should be optimized after the setup in an open-circuit test
(50% of rated speed):
• To that end, adjust Parameter
Voltage Constant 383 in small steps until the actual value parame-
ter
Rotor Flux 225 displays value “101%” (±0,5%).
11/13
ACU
Spindle Applications 27
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