DPS now. VFD later. Keep the motor at 220 V.
This plan turns the Discord thread photos and the Amazon DPS product data into a practical wiring roadmap. It is not a substitute for the DPS/VFD manuals or local electrical code, but it keeps the big decisions straight.
Known facts from the thread
Motor output from the Lagun nameplate.
Dual-voltage three-phase motor.
Use this full-load current for DPS/VFD sizing checks.
Base speed at 60 Hz.
Continuous-duty service rating.
Existing Allen-Bradley starter coil marking.
| Observed item | Meaning | Action |
|---|---|---|
| Motor terminal box | Appears already jumpered for low-voltage 220 V operation. | Keep this configuration for DPS or VFD unless verified otherwise. |
| Starter/control box | Old magnetic starter with contactor and overload heaters. | Inspect before use; do not assume the coil/overloads still match. |
| Top-right conduit/feed | Identified in the thread as the original three-phase outlet/feed path. | Meter everything before repurposing; wire color alone is not proof. |
| Amazon MY-PS-5 | 200-240 V DPS listed for 3 HP / 9 A motors. | Close, but marginal for this 9.5 A motor. |
Safety boundary: lock out power, verify with a meter, bond the machine and motor frame to equipment ground, and use a qualified electrician for final mains wiring.
Diagram 1: what exists today
The photos show a traditional three-phase machine power path: incoming three-phase feed, starter/overloads, then motor terminal box. The motor box appears set up for 220 V.
Diagram 2: DPS now
The DPS is a phase converter, not a VFD. It is for making the three-phase spindle motor run from a 200-240 V single-phase supply. It does not give real speed control.
Target DPS stage: 200-240 V single-phase supply -> larger DPS -> 200-240 V three-phase output -> motor kept in 220 V jumper configuration.
Diagram 3: starter decision
The old magnetic starter may be usable with the DPS, but only if the DPS manual covers that arrangement and the starter hardware still matches the motor.
Keep starter temporarily
DPS output | v old starter / overloads | v motor
Only if the DPS manual allows it. Verify the 208 V coil, contact rating, and overload/heater sizing for 9.5 A.
Bypass starter power path
DPS output | v manufacturer-approved motor path | v motor
Use this if the old contactor/control scheme is questionable or the DPS manual does not support it.
Do not backfeed unknown machine circuits. The DPS product page says one DPS is for one motor. Identify accessories before energizing any old panel wiring.
Diagram 4: motor terminal concept
This is a concept diagram, not a replacement for the nameplate or a meter. The photo appears to show low-voltage jumper grouping suitable for 220 V operation.
Diagram 5: VFD later
A VFD is the better long-term controller if you want speed control, soft start, reversing, acceleration/deceleration ramps, and programmable motor overload protection.
| VFD parameter | Starting value |
|---|---|
| motor voltage | 220 V or 230 V |
| motor current | 9.5 A |
| base frequency | 60 Hz |
| base speed | 1730 RPM |
| motor power | 3 HP / 2.2 kW |
| accel/decel | start conservative, then tune |
Pre-power and first-run checklist
- Supply: confirm the branch circuit is 200-240 V single-phase and matches the DPS input-current requirement.
- Motor: confirm terminal jumpers are still the 220 V configuration.
- Ground: confirm motor frame and machine frame are bonded to equipment ground.
- Wiring: replace cracked, brittle, loose, or heavily taped conductors before energizing.
- Starter: if retained, verify 208 V coil behavior, contact condition, and overload/heater suitability for 9.5 A FLA.
- Loads: keep the DPS output dedicated to the spindle motor unless the manufacturer explicitly allows more.
- Jog: start unloaded if possible and jog briefly.
- Rotation: if backwards, swap any two DPS/VFD output legs. Do not swap supply conductors.
- Heat: after 10-15 minutes, check motor and starter temperature. Too hot to keep a hand on means stop and investigate.
- Current: under normal load, measure current on each output leg if possible.
This page intentionally keeps exact jumper rewiring instructions conservative. The photo suggests the correct 220 V setup already; final confirmation should come from the motor nameplate, continuity checks, and the device manuals.