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Download 2098-IN003 - Rockwell Automation
Transcript
Connecting Your Ultra3000 3-5 Single-Phase Power Wired to Single-Phase Drives The following examples illustrate grounded single-phase power wired to single-phase Ultra3000 drives when phase-to-phase voltage is within drive specifications. Figure 3.4 Single-Phase Grounded Power Configurations Transformer Secondary L1 TB1 L1 L2 L2/N L1 L1 230V ac Output AC Line Filter L2 L2 Ultra3000 Single-Phase TB1 Terminals E Bonded cabinet ground bus Ground grid or Power distribution ground Transformer Secondary L1 115V ac Output L1 L1 TB1 L1 L2/N L2/N AC Line Filter L2/N L2 (Neutral) Ultra3000 Single-Phase TB1 Terminals E Bonded cabinet ground bus Ground grid or Power distribution ground Note: Reducing transformer output will reduce motor speed. Note: Feeder and branch short circuit protection is not illustrated. Isolation Transformer in Grounded Power Configurations When using an isolation transformer, attach a chassis ground wire to the neutral connection. This accomplishes the following: • Prevents the system from floating and thereby avoids any high voltages that might otherwise occur (e.g., through static). • Provides a solid earth path for fault conditions. ATTENTION ! If the supply transformer is an auto transformer (not recommended), a chassis earth ground should not be added. A chassis earth ground should already be included elsewhere in the system, and adding another would create a short. Publication 2098-IN003E-EN-P — April 2004
