1756-CN2R-CC A-B Power Board
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Inspect Medium Voltage Cable Connections Verify that all MV power cable connections and grounding cables are torqued to specification. Apply torque sealer where necessary. Check for corrosion, excessive temperature, or contamination. Inspect Power Cable and Control Wire Terminals Loose connections in power circuits can cause overheating that can lead to equipment malfunction or failure. Loose connections in control circuits can cause control malfunctions. Loose bonding or grounding connections can increase hazards of electrical shock and contribute to electromagnetic interference (EMI). Check the tightness of all terminals and bus bar connections and tighten securely any loose connections. Replace any parts or wiring damaged by overheating, and any broken wires or bonding straps. Refer to the User Manual for torque values required for power cable and bus hardware connections. Inspect Transformer Secondary Windings Check the Incoming Line Power Cable connections (L1, L2, and L3), the Outgoing Motor Power Cable connections (U, V, W), and the Isolation Transformer Power Cable Connections are torqued to specifications. See Figure 9 on page 19 and Figure 10 on page 19.Inspect the bus bars and cable connections. Check for any signs of overheating / discoloration and tighten the bus connections to the required torque specifications. Clean all cables and bus bars that exhibit dust build-up. Check for corrosion, excessive temperature, or contamination.
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