The 24 V DC power supply, the heart of the cabinet, if undersized causes voltage sag and unstable PLC/sensor operation. Adding 25-30% margin to the total load current is standard.
- Current — total load + 25-30% margin
- Peak current — inrush of contactor/valve coils
- Redundancy — dual supply + diode module for critical systems
Ageing supplies lose efficiency and overheat; for unclear faults measure the 24 V rail under load.
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