Troubleshooting High-speed lifters
LIFT MASTER Specification with three-phase motor
The table below shows the cause and solution to be taken when a trouble occurs. Switch off the power before checking.
| 1 | Does not operate |
|---|---|
| 2 | Operates in reverse |
| 3 | Operation is unstable |
| 4 | Slip down |
| 5 | Poor stopping accuracy |
| 6 | Abnormal noise/vibration occurs |
LIFT MASTER Specification with servo motor
The table below shows the cause and solution to be taken when a trouble occurs. Switch off the power before checking.
※For servo motor drive types, see also the motor manufacturer's instruction manual.
| 7 | Does not operate |
|---|---|
| 8 | Operation is unstable |
| 9 | Misalignment |
| 10 | Abnormal noise/vibration occurs |
LIFT MASTER Specification with three-phase motor
| 1 | Does not operate |
|---|
| Cause 1 | Power is not switched on | Inspection method | Check power supply voltage | Solution | Connect power supply circuit correctly |
|---|---|---|---|---|---|
| Cause 2 | Poor connection of motor terminal block screws | Inspection method | Check for loose or unconnected screws | Solution | Connect securely |
| 2 | Operates in reverse |
|---|
| Cause 1 | Phase order of power lines (U, V, W) is different | Inspection method | Check phase order of power lines (U, V, W) | Solution | Replace two of power lines (U, V, W) |
|---|
| 3 | Operation is unstable |
|---|
| Cause 1 | Overload, brake release | Inspection method | Check connection of power lines (U, V, W phases), etc. | Solution | Fix loose terminals, etc. |
|---|
| 4 | Slip down |
|---|
| Cause 1 | Malfunction of brakes | Inspection method | Check for brake operation noise | Solution | Please contact us |
|---|---|---|---|---|---|
| Inspection method | Check for loose or unconnected screws | Solution | Connect securely |
| 5 | Poor stopping accuracy |
|---|
| Cause 1 | Worn brake lining | Inspection method | Inspect brake gap | Solution | Adjust brake gap |
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| 6 | Abnormal noise/vibration occurs |
|---|
| Cause 1 | Loose bolts for fixing main unit | Inspection method | Check installation and loose bolts | Solution | Install correctly and tighten fixing bolts securely |
|---|---|---|---|---|---|
| Cause 2 | Open phase of power supply | Inspection method | Measure power supply voltage (U, V, W) | Solution | Connect power supply properly |
LIFT MASTER Specification with servo motor
| 7 | Does not operate |
|---|
| Cause 1 | Power is not switched on | Inspection method | Check power supply voltage | Solution | Connect power supply circuit correctly |
|---|---|---|---|---|---|
| Cause 2 | Overloaded | Inspection method | Trial operation without load | Solution | Lighten load or change motor capacity |
| Cause 3 | Servo amplifier and motor are not connected | Inspection method | Check connection of power lines (U, V, W phases) | Solution | Set up correctly |
| Cause 4 | No speed/position command input | Inspection method | Check input signal | Solution | Enter speed/position command correctly |
| Cause 5 | Servo-on signal remains off | Inspection method | Check servo-on signal | Solution | Turn on servo-on signal |
| Cause 6 | Incorrect mode selection of command pulse | Inspection method | Check command pulse form | Solution | Set up correctly |
| Cause 7 | Forward drive inhibit and reverse drive inhibit input signals remain off | Inspection method | Check input signal | Solution | Turn on input signal |
| Cause 8 | Failure of servo amplifier | Inspection method | Inspect internal circuit board | Solution | Replace servo amplifier |
| 8 | Operation is unstable |
|---|
| Cause 1 | Poor wiring connection | Inspection method | Check connection of power line (U, V, W phase) and signal line connector | Solution | Fix loose terminals and connectors |
|---|
| 9 | Misalignment |
|---|
| Cause 1 | Increased backlash of reducer | Inspection method | Check misalignment in positioning operation to an origin or a predetermined position | Solution | Need an overhaul Please contact us |
|---|---|---|---|---|---|
| Cause 2 | Defective servo motor or servo amplifier | Inspection method | Check operation of motor itself (Positioning) Check rotation amount |
Solution | Replace servo motor and/or servo amplifier |
| 10 | Abnormal noise/vibration occurs |
|---|
| Cause 1 | Loose bolts for fixing main unit | Inspection method | Check installation and loose bolts | Solution | Install correctly and tighten fixing bolts securely |
|---|---|---|---|---|---|
| Cause 2 | Insufficient servo gain adjustment | Inspection method | Check servo gain | Solution | Adjust servo gain |
