Lack of   phase, power failure

1, Bad   contact of Conductive Rails joints

2, Too much   wear length of Conductive Carbon Brushes
  3, The steel strips delaminated with Conductive Rails

4, Bad   contact between Brushes and Conductive Rails, and foreign bodies in Conduits.

1, Check the   contact of Conductive Rail joints, replace joints or Rails. 

2, Check the   wear of the Collector guide wheels, replace Current Collector or its Guide Wheels   and/or Brushes.
  3, Replace the Conductive Rails.

4, Clean the   Brushes surface and remove the foreign bodies inside Conduits.

Under   voltage occurs at heights irregularly

1, The   distance between the hoist and transformer is too far, and the cable cross   section is too small.

2, There is   high power appliance at branch cable.

1, Replace   by bigger cross sectional cable.

2, Use the   cable specially for the hoist.

Obvious   Conductive Conduits deformation (S shape) causes Collector to be unable to   move normally.

1, The   Fastener spacing is too big, or the Fastener is loose.

2, The   conduits sliding down.

1, Shorten   the distance between the Conduit Connectors and the Conduit Fasteners, and   adjust them. 

2, Check the   fastening of the Fastener bolts.

3, Add more Anti-drop Suspenders.

The Conduits   shake too much when hoist running.

1, Straightness   of the Conduits is not good.
  2, Conduit Fasteners are loose.

1, Correct   the verticality of the Conduits.
  2, Fasten the bolts of Conduit Fasteners.

Too fast   Brush wear. 

1, Conductive   Rail joints are not smooth.
  2, The current-carrying capacity is too large that cause arc burns.

3, Bad   contact of Brushes and Conductive Rails produces spark burns.

1, Check and   adjust joints of Conductive Rails to make them smooth to ensure the contact   area of Brushes and Conductive Rails be 60-90%. 

2, Increase   quantity of Current Collector.

Scratch and   pits at Brush side.

1, Bad   positioning of the Current Collector so its Guide Wheels wear.

2, The   Current Collector cannot move left or right freely so that its side force is   big.

1, Replace   Collector or Guide Wheels.

2, Adjust or   replace the Collector Guide Device.
  
 

Big noise   when the Collector sliding.

1, The   Conductive Rail joints are not smooth.

2, Verticality   of Conductive Conduits is not good.

3, The   Collector Guide Wheels damage.

1, Check the   contacts of Conductive Rails, make a smooth transition between the two   Conductive Rails.

2, Adjust   the verticality of Conduits.

3, Replace   the Collector guide wheels.

Easy   tripping in rainy days.

1, There is   water in the Junction Box.

2, There are   some foreign bodies in the input end of the Conduit at the bottom.

3, Crack of   Collector make the water and dust go in.

1, Drain the   water and make more drain holes at the bottom of Junction Box.

2, Clean the   foreign bodies, move the cable out of the Conduits.

3, Replace   the Collector.

Easy burn   and spark-over at the contact of Brushes and Conductive Rails at the bottom   position where the Non-VFD hoists stop.

Starting   current of no inverter hoists is larger.

Increase the   Collector quantity.