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Frequency operating range for Eaton's S811+ soft starters?

Frequency operating range for the S801+ and  S811+ is 47-63 Hz

The soft starter has protective features to address line frequency instability and/or excessive variations.  This protection may be set to Fault Warning Status
to allow continued operation during excessive frequency variations.

Line Frequency (high) trip level threshold range is 5–150% (default 150%) of line
voltage. The Line Frequency Trip Delay range is 1–60 seconds (default 3 seconds).

Line Frequency (low) trip level threshold range is 5–150% (default 50%) of line
voltage. The Line Frequency Trip Delay range is 1–60 seconds (default 3 seconds).