During Upward Travel
1. During upward travel the motor and pump run but the car does not start
The shut-off valve is closed
Open the valve (operating with the valve closed causes the pressure to rise sharply).
The car is caught on the guide rails or elsewhere
Check and eliminate the problem.
The cylinder rod is jammed or out of the vertical tolerance (3mm)
Check and eliminate the problem.
The motor rotates in reverse
Swap the motor phases or the primary-side phases (R, S, T) (see the motor wiring diagram (Korean)) (reverse rotation of the pump causes a loud noise)
The motor is running on a single phase
Check and fix the wire connections in the control box, terminal box, etc. (it rotates briefly but has no power, and may burn out).
The motor is wired incorrectly
Refer to the motor wiring diagram (Korean). It is inside the terminal block cover (not interchangeable).
The unit piping is incorrect
Check especially the piping lines of the pump and valve.
The coupling shaft between the motor and pump is broken
Check and take action.
No power is supplied to coil A or the voltage is low
Check the voltage and distinguish DC or AC (Donam uses DC 110V).
Foreign matter is caught in coil A or the coil is not tightened enough
Remove foreign matter, clean and tighten sufficiently (the valve is not closing fully).
Adjuster #1 is open too far
Turn it clockwise while watching for changes (the adjuster is sensitive).
Adjuster #2 is closed
Turn it counterclockwise little by little (the adjuster is sensitive).
The relief adjuster pressure is set too low
Close the shut-off valve and turn it clockwise little by little until the specified value is reached. However, do not exceed 70kg/cm² (after adjustment, the bolt must be tightened to lock it).
2. The start is delayed
Adjuster #1 is open too far
Turn it clockwise while watching for changes.
Adjuster #2 is closed too far
Turn it counterclockwise while watching for changes.
3. The start is too fast and the shock is severe
Adjuster #1 is closed too far
Turn it counterclockwise while watching for changes.
Adjuster #2 is open too far
Turn it clockwise while watching for changes.
4. No high speed after starting; keeps running at low speed
The motor capacity is too small or it is running on a single phase
Check the motor capacity, and check and fix the terminal block, magnetic switch and other parts.
No power is supplied to coil B or the voltage is low
Check the voltage and whether it is AC or DC
There is foreign matter in coil B
Disassemble and clean coil B (be careful not to lose parts).
The friction pressure is high because the cylinder or car is jammed
Check mainly the car or guide rails. Check the surface of the cylinder rod and the condition of the packing (replenish lubricant, etc.).
5. Abrupt slowdown with severe shock when decelerating
Adjuster #3 is open too far
Turn adjuster #3 clockwise (try adjusting adjusters #3 and #4 together).
Adjuster #4 is closed too far
Turn adjuster #4 counterclockwise (try adjusting adjusters #3 and #4 together).
Adjuster #2 is closed too far
Turn adjuster #2 counterclockwise slightly.
No power is supplied to coil A or the voltage is low
Check the supply voltage and whether it is AC or DC.
6. Keeps running at high speed without slowing down
Power is supplied to coil B and it remains magnetized
Check coil B for a power short circuit.
Adjuster #3 is closed too far
Turn adjuster #3 counterclockwise little by little.
Adjuster #2 is open too far
Turn adjuster #2 clockwise little by little.
Adjuster #4 is open too far
Turn adjuster #4 clockwise little by little.
Adjuster #1 is closed too far
Turn adjuster #1 counterclockwise little by little.
The O-ring on part "U" of adjuster #1 (bypass) has come off and is jammed
Disassemble the valve and replace the O-ring.
7. The car stops a certain distance short of the landing floor and goes no higher
Coil A and coil B are swapped
Swap coil A and coil B.
The cylinder is too short
Check the stroke and the cylinder length.
The cylinder is installed incorrectly
Adjust the cylinder height.
The landing limit switch is positioned incorrectly
Correct the limit switch position.
The oil is insufficient
Replenish the oil (if there is a leak, fix it first).
8. The slowdown speed is too slow
Adjuster #4 is closed too far
Turn adjuster #4 counterclockwise.
Adjuster #3 is open too far
Turn adjuster #3 clockwise slightly.
9. Severe shock when landing
The slowdown speed is too fast
Turn adjuster #4 clockwise.
Adjuster #5 is open
Turn adjuster #5 clockwise.
The slowdown zone is too short
The slowdown zone must be adjusted. When the car speed is 0.5m/sec (30m/min), a slowdown zone of 50cm is ideal.
Normally the motor should keep running for 0.5 ~ 1 second after coil A is de-magnetized. Adjuster #5 can be adjusted in this state.
The moment the cylinder rod is fully extended coincides with the moment the car stops
Check the cylinder length and the installation height.
Adjust the spacing of the limit switch or guide plate.
10. The car stops off the landing position
The landing limit switch has moved further up
Correct the limit switch position.
The slowdown speed is fast
Turn adjuster #4 clockwise.
Adjuster #5 is closed too far
Turn adjuster #5 counterclockwise.
11. Other possible symptoms, causes and remedies
The car travels irregularly or pulsates
Completely remove the air inside the cylinder.
Check the cylinder rod surface for bending (open the air valve and let oil flow out, feel it by hand, check with a plumb bob).
The car vibrates or is very noisy
Check the cylinder centre position.
Check the guide rail surface and apply lubricant.
If the oil is insufficient, replenish it (open the air valve and let oil flow out, feel it by hand, check with a plumb bob).
The car cannot climb or barely climbs when slowing down from travel (climbs while shaking)
The relief set pressure may be set lower than the specified value. (Open the air valve and let oil flow out, feel it by hand, check with a plumb bob)