GPFFV
ASCII - Command | GPFFV |
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Syntax Transmit | GPFFV [Data] |
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Syntax Receive | GPFFV <Data> | Available in |
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Type | Variable rw | MMI | Yes | |
ASCII Format | Float | CANBus Object Number | 3545 (hex) | |
DIM | - | PROFIBUS PNU | 1669 (dec) IND = 0000xxxx (bin) | |
Range | 0.0 .. 50.0 | DPR | 69 (dec) | |
Default | 1.0 |
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Opmode | 4, 5, 8 | Data Type Bus/DPR | Integer32 | |
Drive State | - | Weightning | 1000 | |
Start Firmware | 1.20 |
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Configuration | No | Revision | 1.8 | |
Function Group | Position Controller | EEPROM | Yes | |
Short Description | Position Control Loop: Feed Forward for Velocity | |||
Description
This variable is used both in the P position control loop (EXTPOS=1, 3, 4), and in the PI position control loop (EXTPOS=0, 2). Feed forward is used to ease the position controller task. A better setting for GPFFV means better utilization of the dynamic range of the position controller. The most favorable setting (usually about 1.0) depends on factors external to the drive such as friction, dynamic resistance, and stiffness. If GPFFV is set too low, the drive lags. If GPFFV is set too high, the drive oversteers.