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Troubleshooting Guide

11

Fault Code

Status Light

Fault Description

Problem

Solution

SOLID ON

Check safety tether

Safety tether is disconnected 

from controller or faulty con-

nection internally with tether 

switch.

Attach safety tether to control box. If 

necessary, check connections inside 

controller. Ensure control box is discon-

nected from power source prior to 

opening control box.

2 FLASHES

Power line voltage too low

Not enough power coming 

into controller to start or run 

grinder.

Be sure to use the appropriate exten-

sion cord (see Safety) and/or generator 

(10 kW, 115V if applicable). 

3 FLASHES

Power line voltage too high

Excessive power coming into 

controller.

Ensure grinder is plugged into an outlet 

and/or generator (if applicable) with the 

appropriate voltage. 

4 FLASHES

Motor short circuit or overload

Motor may be overheating 

due to using too long of an 

extension cord or because the 

outlet/generator is the wrong 

voltage.

Allow motor to cool before resetting fault 

code. Reduce amp draw by removing 

weights from grinder deck and/or reduc-

ing motor’s RPM. Ensure use of proper 

extension cord, outlet, and/or generator.

5 FLASHES

Controller overheating

Internal components of con-

troller are too hot.

Ensure external fan is plugged into con-

troller and is working properly. Reduce 

amp draw by removing weights from 

grinder deck and/or reducing motor’s 

RPM.

6 FLASHES

Open motor phases

No power from controller 

motor.

Ensure motor is properly connected to 

control box.

NO FLASHING 

LIGHTS or ANY 

LIGHTS AT ALL

No illuminated status lights or 

fault codes

Reset power supply circuit 

breaker if necessary; if the 

power source is working, it 

is likely the fuse inside the 

control box is blown.

Prior to opening control box, ensure it is 

disconnected from power source. Wait 

30 seconds for power to discharge from 

capacitors after disconnecting. Replace 

fuse. 

Note: 

For additional maintenance and repair information, reference this machine’s Service Manual.

Summary of Contents for 8274-4

Page 1: ...Read Manual Before Operating Machine 402902 Rev B 8274 4 PLANETARY GRINDER OPERATING MANUAL...

Page 2: ......

Page 3: ...s and Assembly 7 Loading and Unloading 7 Handle Assembly 7 Vacuum Port 7 Rubber Dust Guard 7 Magnetic Tooling Holder Installation 8 Pre Production Safety Checks 8 Operation 9 Start Up Procedure 9 Shut...

Page 4: ...e Weights Allows operator to easily add down pressure when required 90 Rotating Grinder Deck Grants easy access to the quick change magnetic tooling Control Box Self diagnoses and minimizes blown circ...

Page 5: ...chine is not in use and or lower cutting head to the floor Do not force equipment Equipment will perform best at the rate for which it was designed Excessive force only causes operator fatigue increa...

Page 6: ...ter stopping the machine Use correct tooling and accessories Provide barriers or shields as needed to protect others from debris Use for correct applications Do not force equipment to do heavier duty...

Page 7: ...RUBBER DUST GUARD Attaching 1 Ensure machine is in upright position 2 Attach dust guard Figure 3 keeping as close to the floor as possible Note If dust is exposed when operating machine stop machine...

Page 8: ...the machine If the rubber guard is cut damaged or worn out replace before using the machine WEIGHTS Weights rotate front to back To apply added weight one or or both weights can be rotated forward Fi...

Page 9: ...ne and 2 the surface area the weight is being distributed across If tooling with a smaller segment is used the amount of down pressure applied at the point of contact is increased Larger segments of t...

Page 10: ...Attaching The Velcro PlateAdapter The Velcro plate adapter attaches magnetically to the Magnetic tooling plate and snaps into place Figure 9 Mounting Brazed Diamond and Polishing Pads The brazed diam...

Page 11: ...ord or because the outlet generator is the wrong voltage Allow motor to cool before resetting fault code Reduce amp draw by removing weights from grinder deck and or reduc ing motor s RPM Ensure use o...

Page 12: ......

Page 13: ...or not caused by or resulting from the negligence of seller and or the manu facturer of the product unless specifically provided herein This warranty shall not apply to any products or portions there...

Page 14: ...9250 Xylon Avenue N Minneapolis MN 55445 U S A Toll free 800 245 0267 Phone 763 315 5300 Fax 800 648 7124 Fax 763 535 8255 Web Site www nationalequipment com E Mail info nationalequipment com...

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