R-Pro › Field cases › Refrigeration systems
Overcurrent and Overheating from Low Voltage
Likely causes
Excessively long supply wiring or undersized conductor
Check: Measure voltage directly at compressor terminals (during both run and start)
What to do: Measure voltage directly at compressor terminals (during both run and start) → Verify within ±10% of rated voltage → Calculate voltage drop based on wire gauge and length → Tighten terminal screws and check contact quality → If voltage is unstable, contact utility or licensed electrician
Voltage drop from poor terminal contact
Check: Verify within ±10% of rated voltage
What to do: Verify within ±10% of rated voltage → Calculate voltage drop based on wire gauge and length → Tighten terminal screws and check contact quality → If voltage is unstable, contact utility or licensed electrician
Unstable supply voltage at source
Check: Calculate voltage drop based on wire gauge and length
What to do: Calculate voltage drop based on wire gauge and length → Tighten terminal screws and check contact quality → If voltage is unstable, contact utility or licensed electrician
Under low voltage, the compressor draws more current to maintain output, causing overheating. Inspect the power supply. Voltage imbalance above 3% on a 3-phase motor causes overheating and premature failure.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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