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You're very fortunate you didn't do some serious damage to your appliances. 25% high frequency, and who knows what voltage on your 220 Volts leg to leg.

R Racing is correct, the legs of three phase are 120 degrees out of phase. Single phase are 180 degrees out of phase. You need to set up the unit to run at single phase 120/240 and then check to make sure you're getting 220/240 voltage in your breaker panel across L1-L2. You need to start...