It has two sets of power going into it 53v and 10v.
If line 1 has 53v and line 2 has 10v it runs at full speed.
If line 1 has 53v and line 2 has 0v it runs at half speed.
If line 1 has 24v and line 2 has 10v it runs at half speed.
If line 1 has 24v and line 2 has 0v it proably won't run.
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