Motor Starting Study Template (Excel)
Free download · Excel (.xlsx)
Large motor starts can cause voltage dips that affect other equipment on the same bus. This template documents the motor starting study data: motor nameplate (kW, voltage, FLC, locked rotor current, code letter), starting method (DOL, star-delta, autotransformer, soft starter, VFD), source impedance, cable impedance, calculated voltage dip percentage at the motor terminals and upstream bus, and the pass/fail assessment against the standard limit (typically 15% for AS/NZS, 3-5% for sensitive equipment). Includes fields for multiple motors starting in sequence. Use with ECalPro's voltage drop and motor calculators to verify results.
What's Included
How to Print
- ●Open in Microsoft Excel 2016+, Google Sheets, or LibreOffice Calc
- ●Add your company logo and project details to the header
- ●Copy data rows to add more circuits or equipment
- ●Print on A4 or A3 landscape for site records
- ●Keep completed records for design verification and audit trail
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Frequently Asked Questions
What size motor requires a starting study?
Generally motors above 7.5-11 kW (10-15 HP) on weak supplies, or any motor where the locked rotor current exceeds 10% of the transformer capacity. Check your utility or site connection agreement for specific limits.
What starting methods does this template cover?
Direct-on-line (DOL), star-delta, autotransformer, soft starter, and variable frequency drive (VFD). Each method has different starting current multipliers entered in the template.
How do I calculate voltage dip during motor starting?
Voltage dip = (Starting current × Cable + Source impedance) / (Supply voltage). Use ECalPro's voltage drop calculator for precise results including cable reactance at the starting power factor (typically 0.15-0.25).