Festo CMMT-ST-SW, Original Instructions Manual

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7.3.1 CiA 402
Open-loop operation objects
Parameters Index.Subindex Name Data type
Px. Manufacturer-specific objects: saved basic unit for the object is effective.
270 0x219C.02 Reactive current setpoint value FLOAT32
662 0x219C.03 Time current increase FLOAT32
4001 0x219C.04 Activation of open-loop operation BOOL
4004 0x219C.07 Active control structure UINT32
4005 0x219C.08 Selection of mode of operation open-
loop/closed loop UINT32
4006 0x219C.09 Selection of mode of operation UINT32
4007 0x219C.0A Active mode of operation UINT32
4008 0x219C.0B Velocity switching threshold FLOAT32
4010 0x219C.0D Current rise time FLOAT32
4026 0x219C.15 Current reduction activation BOOL
4027 0x219C.16 Current reduction delay time FLOAT32
4028 0x219C.17 Current reduction scaling factor FLOAT32
6694 0x219C.14 Factor current setpoint value FLOAT32
Tab. 405 Objects
7.4 Field weakening
Function
Synchronous motors can only be operated at a specific rotational speed. If the induced motor voltage
reaches the level of the DC link voltage, the torque rapidly decreases.
The objective of field weakening is to reach higher rotational speeds. In field weakening the motor
negative field voltage is reduced by a negative reactive current. This enables the motor to be operated
above the nominal rotary speed. The negative reactive current must be limited for some motors.
Parameters and diagnostic messages
ID Px. Parameters Description
Specifies whether the field weakening is active or inactive.
Access read/write
Update effective immediately
102201 Activation of field
weakening
Unit −
Technology functions
427 Festo — CMMT-ST-SW — 2019-02