TRAINING – OME Inc.

How To use A Multimeter

Download The Pdf for Multimeter training.

Training Videos Motor Controls

3 Phase Motor Wiring

How to Test Your Spindle Motor for Short to Ground

1. Set your multimeter to Ohms.

2. Start by completely disconnecting the spindle motor from all power sources.

3. Check each wire, including T1, T2, T3 and the ground wire. If the reading is infinite, your motor should be fine. If you get a zero reading or any continuity reading, you have either a motor problem or a cable problem.

4. Assuming you did not get an infinite reading, disconnect the motor from the cable and test each separately. While testing, make sure the leads on each end are not touching other leads or anything else. This should allow you to isolate your problem.

How to Test Your Spindle Motor for Open or Short in Windings

1. Set your multimeter to Ohms.

2. Test T1 to T2, T2 to T3, and T1 to T3. Each time, you should get a reading of around .8 Ohms, although anything from .3 to 2 is acceptable. If you get a reading of 0, you have a short between phases. If your reading is infinite or significantly over 2 Ohms, you probably have an open.

3. If your spindle motor fails the test, you may want to make sure the problem is not with the connector, which may have coolant on it that’s interfering with your results. If you dry and retest, you may get a better result.

4. Check your inserts. If the motor inserts have burn marks, this may be causing your short and you should replace them. You should also check for wear where the cable moves through tracking.

Variable Frequency Drives / Soft Starters

Installing 220v Outlets

Example:	*Volts*	*Wattage*	*Amps*	*wire size*
outlets	240	3000 watts	15 amp	14 awg
hot water tank	240	4800 watts	20 amp	12 awg
heat pump	240	6000 watts	25 amp	10 awg
dryer	240	7200 watts	30 amp	10 awg
stove	240	9600 watts	40 amp	8 awg
hot tub	240	12000 watts	50 amp	6 awg
sub panel/welder	240	14,400 watts	60 amp	6 awg
heating	240	16,800 watts	70 amp	4 awg
sub	240	19200 watts	80 amp	4 awg
heating/central	240	21600 watts	90 amp	2 awg
main panel	240	24000 watts	100 amp	1 awg
main panel	240	30000 watts	125 amp	1/0 awg
service panel	240	48000 watts	200 amp	3/0 awg

2 Post Lifts

4 Post Lift Cable Inspection / Leveling Guide

Raise the lift 3 ft. and confirm that all four safety latches engage and disengage completely.

Refer to diagram at above. Commence adjusting the level of both runways by tightening or loosening the wire rope (cables) using the ¾” NC Hex Nut at the top of each column.

Use plastic ties and clamps to secure all hydraulic and air lines that droop or hang down from the lift. Install a hose protector if required. Ensure, that no hydraulic or air lines come in contact with any lifting cable.

Operate the lift with a vehicle. Raise and lower the lift three times. Confirm all the operational functions, equalizing cables and safety lock work well.

Air Compressor Troubleshooting Guide

HARDWARE/ PRESSURE SWITCHES

· Check Low Oil Pressure Switch and verify Oil Levels, verify it is receiving 110v.

· Check tank is empty of water and electronic tank drain is functioning, verify it is receiving 110v.

· Verify pressure switch is operational and functioning, verify it is receiving 110v.

(Voltage can be higher if compressor does not use transformer.)

COMPRESSOR TROUBLESHOOTING

*Symptoms*	*Possible Causes*	*Corrective Action*
Motor will not start.	1. Main switch and fuses open. 2. Starter magnetic coils open. 3. Thermal overload tripped. 4. Defective pressure switch-contacts will not close. 5. LOSC, (Lube Oil Switch) malfunction. 6. Low voltage.	1. Check all fuses and switches. Check for loose or faulty wires. 2. Check overload relay in starter. Reset starter. 3. Reset starter. If starter trips repeatedly, have electrical system inspected by an electrician. 4. Repair or replace pressure switch. Warning – Relieve tank pressure before servicing. 5. Check with voltmeter. Be sure voltage corresponds to unit specifications.
Starter trips repeatedly	1. Improperly adjusted pressure switch. 2. Faulty check valve. 3. Incorrect fuse size or magnetic starter coil. 4. Low voltage. 5. Defective motor.	1. Adjust or replace. Warning – Relieve tank pressure before servicing. 2. Clean or replace Warning – Relieve tank pressure before servicing. 3. Be sure that fuses and coils are properly rated. 4. Check with voltmeter. Be sure voltage corresponds to unit specifications. 5. Replace motor
Tank pressure builds up slowly.	1. Air leaks. 2. Dirty air filter. 3. Defective compressor valves	1. Tighten fittings. 2. Clean or replace. 3. Install new valves
Tank pressure builds up quickly.	1. Excessive water in tank	1. Drain tank.
Discharge pressure relief valve pops off while compressor is running.	1. Wrong pressure switch setting. 2. Defective ASME relief valve	1. Adjust to correct. setting. 2. Replace valve Warning – Relieve tank pressure before servicing
Compressor will not unload (Units with head unloaders)	1. Wrong pilot valve setting. 2. Defective pilot valve. 3. Lack of air to pilot valve.	1. Adjust to correct setting. 2. Replace pilot valve. 3. Open ball valve to pilot valve.
Excessive belt wear.	1. Pulley out of alignment. 2. Belts too tight or too loose.	1. Realign motor pulley. 2. Adjust belt tension.
Compressor runs hot.	1. Improper flywheel rotation 2. Defective compressor valves. 3. Dirty air filter. 4. Dirty cylinder and/ or intercooler	1. Check for correct rotation. (Counter clockwise when viewed from drive side.) 2. Install new valve plate assembly. 3. Clean or replace. 4. Clean cylinder fins and/or intercooler
Interstage pressure relief valve pops off	1. Defective compressor valves. 2. Improper valve installation.	1. Install new valves. 2. Verify proper valve placement.
Air escapes from centrifugal unloader when unit is running	1. Centrifugal unloader release valve dirty or detective.	1. Clean or replace valve
Excessive oil consumption	1. Dirty air filter. 2. Wrong oil viscosity. 3. Oil leaks. 4. Worn piston rings. 5. Scored cylinder	1. Clean or replace. 2. Refill with proper viscosity oil. 3. Tighten bolts. Replace gaskets. 4. Replace rings. 5. Replace cylinder
Air escapes from centrifugal unloader when unit is stopped.	1. Check valve stuck in open position.	1. Replace check valve. Warning – Relieve tank pressure.
System does not alternate (Duplex units only)	1. Starter tripped. 2. Loose wiring in alternator. 3. Defective alternator. 4. Defective motor.	1. Reset starter. If starter trips repeatedly, have electrical system inspected by an electrician. 2. Check and tighten all wiring connections. 3. Replace alternator. 4. Replace motor.

Evac Troubleshooting