【 Weak current College 】 Mitsubishi elevator malfunction analysis and solution

Mitsubishi GPS series elevator design maturity, control system operation stable, if maintenance is correct, the failure rate is very low, and you can easily check call failure code, easy to find the direction of maintenance. But if there is negligence, failure is very difficult to find the cause. In the years to maintain the GPS elevator worked on several representative's fault that they are generalizations out for reference.

1 brake failure of insufficient iron core itinerary

Fault is like: one GPS-2-import ladder has been running for eight years. Emergency stop appearing irregularly, and less frequently, after an error can automatically ping layer, open the door, you can continue to run. P1 Panel gives the failure code is EA, brake failure. But check the brake is in poor condition are OK, its resistance value is normal (80-90 ohm), normal braking voltage.

Analysis and solution: a preliminary judgment is not a control cabinet, because if so, be very frequent. Check brake, find its contact gap is small, only 2 1.0mm, should normally. ± 0.5mm And then disassembled for brake core, found that the lack of maintenance for many years, core cavity accumulated oil, resulting in insufficient expansion core itinerary domes, power electromagnetic forces to the maximum, when the external voltage fluctuations or other reasons, the core contraction, brake failure, caused by the contact points. Thoroughly clean the cores and cavities, adjusting the itinerary as 1.5mm iron core, brake clearance open as 2.5mm, fault no longer present.

Summary: the core should be regularly maintained, at least every 3 months time, brake and its contact points should be standardized and regular checks, in this case the failure is due to oil-resistance makes magnetic coils are insufficient to balance the brake force strong spring, causing brake-contact moments, to pass out the error message, the motherboard elevator emergency stop.
2, knocked arch deformation caused by the fault

Trouble phenomenon: a GPS-I imports, run for 7 years, usually with very little trouble, because of wear and replace imported boots, running close to the top-level location emergency stop and then climbing onto the top level, in a non-running without problems, there is no error display P1 plate.

Analysis and solution: sure and top equipment for not to leveling locations, regardless of the limit and limit switches, first check the 1USD, USR switch, manual joins properly, when you hit the bow and switching distance 62mm (standard 58 ± 2mm), large side. To slow running through 1USD, USR, multimeter ° 1USD, USR and 420 of the voltage, the voltage 48V switching action points. That its actions properly. But to express run, hit the bow across the USR there is a moment when voltage attest elevator in high speed operation, through the USR USR USR instant action, but has caused the signal disappears. emergency stop Then check the entire knocked arch, which amongst a SAG, length 30mm, inward curved 10mm, may be installed before the bend. Switch on the wheel surface run time moments. Fix knocked arch deformation and adjust and switch distance to fault disappears after 56mm.

Summary: car replacement guide boots, not reinstated and knocked arch have caused deformation, rare fault, so do the maintenance, you should try to ensure that the relevant size does not change.
3. weighing device fault

GPS series elevator car to signal through the rope head of differential transformer voltage values are given for DA after conversion, transfer to the CPU, and then under car weight, given run curve, GPS elevator in different load still has the ideal comfort. Then if the rope head weighing device is not working properly, the weight value is set in the cabin without load values are small, the lift will not run.

Fault is like: weighing device is faulty, no driver status cannot run, maintenance status can be run. In P1 Board cancels weighing function (WGHO knob 0) after the driver status can run, but no error display P1 plate.

Analysis and solution: in general such failure is due to the rope head of brass sleeve and rope head lever between the debris to lead CU set run blocked. You can clear debris, but note that copper sleeves and do not come between the lever, because oil is easier to accumulate dirt. Then adjust the size of the differential transformer spring as 37.5mm. Finally back to idling, half the data is written to the P1 plate.
4, group control cabinet issues caused by parallel two ladders can't run

Mitsubishi GPS series lift two or more parallel has a group control cabinet, specialized processing returns, emergency power supply for fire runs, stop and other additional features.

Trouble phenomenon: two parallel GPS-I elevator, has been working, suddenly two ladder Express, climbing can run, but check each external lines are normal.

Analysis and solution: two ladder at the same time has the same chance of failure is small, first consider the group control section. Discover FERR, pick-up by electrical appliances not EMRR, then check the coil voltage-free, finally found CR fuse is burnt out, replaced everything is normal.

Summary: different ladder types have different design ideas, the failure is due to the group control part of a key circuit caused by voltage, 420C NS (no services) feature to take effect, resulting in all lifts cannot be run if you are not familiar with its features, from stand-alone check failure and unable to resolve the problem.