I have a 3 Hp 1 Ph 230 V motor. The incoming power changed from 242 V to 252 V and now it trips the overload in the control panel. The specs say not to run above 250 V. I’ve checked the motor and tested it on a test panel and all seems fine. Is there any way to reduce the incoming voltage? The electric company says they are within their acceptable range.
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\$\begingroup\$ @DKNguyen it seems that it is a single-phase motor. \$\endgroup\$– user57037Sep 22, 2022 at 5:27
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1\$\begingroup\$ @mkeith Oh I think I might have read 3 Hp as 3 Ph \$\endgroup\$– DKNguyenSep 22, 2022 at 13:16
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I suspect that the control panel overload is a bit too sensitive. But you might try reducing the size of the start or run capacitor by 10% or so, as it's probably the starting current that trips the overload.
Otherwise, you could utilize a buck transformer to reduce the voltage. The motor probably draws about 12-15 amps, so you could use a 200 VA 240 V to 12 or 16 VAC which will drop the motor voltage to 240 VAC or 236 VAC.
https://electricalacademia.com/transformer/buck-boost-transformer-working-principle/
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2\$\begingroup\$ Good call on the buck transformer. I was gonna suggest same! Very clever transformer application that I've found few people aware of. \$\endgroup\$– Kyle BSep 22, 2022 at 6:19