Is polarity set during the manufacturing process and cannot be changed in the field?

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Polarity is fixed in many equipment designs because the internal wiring and components have a defined orientation that the device relies on to function correctly. When current direction or reference points are set during manufacturing, diodes, capacitors, sensors, or windings are arranged so the device operates as intended. If you could reverse polarity in the field, you could flip the expected current path, cause incorrect readings or protection actions, and even damage the components. Because of this, the polarity is established at manufacture and is not meant to be changed on-site. Some models might allow reversibility, but for the unit in question, field changes aren’t supported.