Lenze EtherCAT Controller-based Automation - Manual (Page 57)

Lenze · Controller-based Automation · EtherCAT® Communication Manual · DMS 6.4 EN · 04/2014 · TD17
57
7 Commissioning of the system
7.3 Detailed description of the commissioning steps
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
7.3.4.7 Setting the feedback system for servo control
Determining the pole position of the synchronous motor
Pole position identification (angle between the motor phase U and the field axis of the rotor) is
necessary ...
• for servo control with a synchronous motor of another manufacturer;
• for servo control with a synchronous motor and use of incremental encoders (TTL or sin/cos
encoder and resolver);
• after changes to the feedback system (e.g. replacement of the encoder).
For Lenze motors with an absolute encoder or resolver, the pole position has already been set
correctly.

Danger!
Using the encoder/resolver as a motor encoder
In the Lenze setting, the resolver/encoder cable is monitored for open circuit.
In the event of a fault, safe operation of the motor is no longer guaranteed!
• For safety reasons, always select "Fault" (Lenze setting) as a response for the (open-
circuit) monitoring of the encoder/resolver.
• To avoid interference injections when an encoder is used, only use shielded motor and
encoder cables.

Danger!
• During pole position identification, it must be ensured that the motor is not braked or
blocked. Pole position identification is therefore not permissible in the case of
hanging loads.
• The rotor will align itself during pole position identification. The motor shaft will
make a maximum of one electrical rotation, as a result of which the connected
machine will move accordingly.
• For firmly braked motors, the function "Pole position identification PPI (without
movement)" must be used.

Stop!
Before carrying out pole position identification, check that the parameters for maximum
current monitoring have been set correctly so that the motor is not permanently
damaged in the event of a fault.