SSI encoder interface (encoder 3)
Connection options for encoder 3:
- Directly to MOVISAFE® CSA31A:X17
- To UEA31A:X19 combi-box, further to MOVISAFE® CSA31A:X17
Technical data/feature | Value | Description |
|---|---|---|
SSI clock frequency | 200 kHz (fixed value) | Frequency of the clock signal within a pulse train controlled by the safety option CSA31A. |
SSl pause time | 20 – 200 µs | The pause time tP controlled by the inverter is the minimum waiting time between the end of a pulse train and the start of the subsequent pulse train. The pause time resolution is 1 µs. The pause time must be greater than the monoflop time specified by the encoder manufacturer. |
SSI frame rate | 1 ms | Rate at which the position is polled from the encoder. |
Startup time | 0 – 32 s | Required time until an SSI encoder can supply data after the supply voltage is switched on. |
Refresh period | 0 – 30 ms | Some encoders need time to refresh the SSI position. The time between two updated positions is the refresh time. The resolution is 1 µs. |
Static tolerance band | 108 (≈10% of the entire value range) | Static tolerance band for monitoring the absolute position. Setting value in encoder increments. |
Speed filter time | 1 – 300 ms | Time interval in which position changes of the encoder are added up to obtain the speed by division. Also sets the response time of the speed-related safety sub-functions. |
Acceleration filter time | 10 – 100 ms | Time interval in which position changes of the encoder are added up to obtain the acceleration by dividing twice. Also sets the response time of the acceleration-related safety sub-functions. |
SSI fault tolerance | 1 – 10 | Number of faulty SSI frames that are still accepted by the system without triggering a fault. |
SSI frame length | ≥ 48 bits | Number of all data bits and status bits. |
Position data | ≥ 32 bits | Number of data bits. |
Coding of position data | Binary code and Gray code | |
Max. length of the encoder cable | 100 m |
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