Pro Edge II, III, IV Spindle Overload Tripping

Guide Number: SG1273 | Printer Friendly Version | View Safety Disclaimer

This document illustrates the steps required to troubleshoot the possible causes of the overload(s) tripping for the spindle motor in the main electrical panel causing an alarm on the screen.

WHILE PERFORMING THIS PROCEDURE ENSURE ALL LOCK OUT / TAG OUT POLICIES IMPLEMENTED BY YOUR COMPANY ARE FOLLOWED CLOSELY.

Skill Level

Estimated time to complete: 1 hour

  1. Reset the alarm on the touch screen.
  2. Open the main electrical panel and push in the three blue buttons on the overload relays to reset them. They will click if the relay was tripped and window will go from black to white.
  3. Check for any blown fuses by inspecting the fuse holders at the top of the cabinet. The F4, F5 and F6 fuses are for the spindle. A lit indicator is a sign of a bad fuse. Check voltage at the bottom of the fuse holder to verify the fuse is good. Check incoming power to the machine as well. Verify 208/240VAC phase to phase.
  4. After resetting the overloads, try running the spindle and see if the alarm comes back and the overload trips again.
  5. If the spindle runs without alarm, return the machine to operation. If the overload trips again to to step 6.
  1. Miter the spindle to 180 degrees, then power down the machine at the disconnect. Open the junction box on the spindle motor and disconnect the six (6) wires noting their original locations.
  2. Check the spindle motor for a bad winding or grounding by testing resistance from phase to phase and phase to ground. Phase to phase resistance should be 3.0 ohms. Phase to ground should be open or OL. Check the top row of terminals as one set (High Speed) and the bottom row as another (Low Speed). If resistance is out of spec, the spindle motor may need to be replaced.
  1. If the spindle ohms out within spec reconnect the power wires and close up the junction box on the spindle motor.
  2. The next step will be to test for an issue with the wiring between the main panel and the spindle motor. On the Pro Edge II’s and III’s, there is a conduit wire run between the main cabinet and the junction box on the top of the machine. From there a multi-conductor cable runs from the junction box to the spindle. On Pro Edge IV’s a multi-conductor cable runs the complete distance from the electrical panel to the spindle motor. Locate the 2T1, 2T2, 2T3, 2T4, 2T5 and 2T6 terminals on the terminal strip. Check the resistance between the following pairs: 2T1 to 2T2, 2T1 to 2T3, 2T2 to 2T3, 2T4 to 2T5, 2T4 to 2T6 and 2T5 to 2T6. Each pair should measure 3.0 ohms of resistance. If any pair fails to meet the 3.0 ohms of resistance spec there is a break in the wire run or cable and it will need to be replaced. On Pro Edge II’s and III’s the same test can be run in the junction box on the top of the machine to isolate the problem to either the conduit main run (Main Panel to Junction Box) or the multi-conductor cable (Junction Box to Spindle Motor).
  1. If the resistance between the six pairs measures within specification the next step is to remove wires 2T1, 2T2, 2T3, 2T4, 2T5 and 2T6 from the left side of the terminal strip in the main electrical panel. Turn power back on to the machine and start the spindle on low speed. Measure voltage across the terminals between 2T1 to 2T2, 2T2 to 2T3, and 2T1 to 2T3. You should get a reading of 208/240 volts AC across each one of the three pairs. If correct voltage is not measured or the overload trips, the low speed starter is bad and will need to be replaced. Start the spindle in high speed and measure voltage across terminals 2T4 to 2T5, 2T5 to 2T6 and 2T4 to 2T6. You should get a reading of 208/240 volts AC across each of the three pairs. If correct voltage is not measured or the overload trips the high speed starter is bad and will need to be replaced.
  2. If the wiring and voltage checks test correctly then call Park Industries Technical Service Department at 1-800-785-3391 for further troubleshooting.

Last updated: November 30, 2020

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Prior to beginning installation, operation, or maintenance, you are advised to carefully read ALL instruction manuals and ALL safety materials and procedures provided with your equipment.

You are solely liable for the proper operation and maintenance of the equipment.

Park Industries® is not responsible for and expressly disclaims liability for any injuries (including death) or damage to the equipment or any other property as a result of improper operation or maintenance of the equipment, as well as failure to comply with the procedures set forth in the equipment’s instructional manual or any other safety materials and procedures. If you encounter any problems or difficulties, you are strongly encouraged to seek professional assistance.

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