U.S. Motors (Nidec)

TITAN Premium Efficiency

General industrial, rotary-screw compressor OEM fit.

Nameplate

Phase: 3-Phase
HP range: 1 – 400 HP
Voltage codes: 208-230/460 V · 460 V · 575 V
NEMA frames: 143T – 449T
Enclosure: TEFC (cast iron)
Poles / RPM: 2, 4, 6, 8
Efficiency: NEMA Premium
Insulation class: F (Class B rise)
Service factor: 1.15
Bearings: Double-shielded regreasable ≥184T
Family: TITAN

Lead connection diagrams

9-lead Wye (High voltage · 460 V)

L1 ─┬─ T1 ── T7
L2 ─┬─ T2 ── T8
L3 ─┬─ T3 ── T9
     T4 ─┐
     T5 ─┼── tied together (neutral point)
     T6 ─┘

Tie T4-T5-T6 together and insulate. Feed line to T1/T2/T3; jumper T7-T1, T8-T2, T9-T3.

9-lead Delta (Low voltage · 230 V)

L1 ─┬─ T1 ── T6 ── T7
L2 ─┬─ T2 ── T4 ── T8
L3 ─┬─ T3 ── T5 ── T9

Parallel pairs: T1-T6-T7, T2-T4-T8, T3-T5-T9. No neutral tie.

12-lead Wye-Start Delta-Run

Start (Wye):
  L1→T1, L2→T2, L3→T3
  T10-T11-T12 tied
  T4/T5/T6/T7/T8/T9 open

Run (Delta):
  T1-T6-T12, T2-T4-T7, T3-T5-T8
  T9-T10, T11 open? — verify nameplate

Always confirm connection chart on the peckerhead lid. NEMA MG-1 12-lead permits dual-voltage + part-winding.

Schematics & manuals

Links point to the manufacturer's own PDF hosting. If a link 404s, search the model number on the manufacturer's Download Center — filenames change with revision.

Field notes

TITAN and Corro-Duty share the same 9-lead connection chart.
Nidec bought Emerson's motor business in 2010 — badges may say 'Emerson' or 'U.S. Electrical Motors'.

The connection charts above are the NEMA MG-1 industry-standard patterns most brands follow. Always confirm the exact chart printed inside your motor's peckerhead lid before landing leads — voltage-code and lead-tag conventions vary between OEMs and production years.

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