Lotem 400
Troubleshooting

L400 TS Load Gripper End Posn 1112

Haim Vaknin
13-Nov-01

Problem - Load Gripper does not reach the end position (EP)

Problem Description
The status of the detectors does not change after the Load Gripper is activated.

Cause

1. Air pressure
   
2. Detector or mechanical problem
   
3. Drum position (enable detector)
   
4. Local board
   

Solution

a. Air Pressure:

1.Verify that the air pressure dial indicator shows 6 atm.
2. Drain excess water from the air pressure unit.

b. Detector or Mechanical Problem:

1. Open the left and right load gripper EP detectors. (Hardware>Drum System>Gripper System) The detectors should be off.
2. Activate the load gripper manually by pushing the load gripper valve in the manifold and check:

• Flags are inside the detectors, and nothing mechanical has prevented them from entering the detectors.
  
• The left and right flags are activated at the same time and are moving at the same speed.
  If not, adjust the piston regulators.
  
• If the flags are inside the detectors, verify that the detector status changes to ON.
  If not, replace the detector. (Check that the detector connectors are plugged in.)
  

c. Drum Position:
In order for the load grippers to be activated by the GUI, the load gripper enable detector should be ON.

1. Bring the drum to load position:
   Others/Lotem 400 (right-click)
   Machine>Unload Head Gripper Location (mm)
   
2. Open the load enable detector
   (Hardware>Drum System>Gripper System and make sure that the status changed to ON.
   If the status does not change, check for:
   

• Existence of silver reflecting tape on head gripper (on drum) and on tail gripper
  
• Defective enable detector
  Try cleaning the enable detector. If that does not help, replace the enable detector.
  
• Wrong drum position
  

d. Local Board:
If none of the above steps helped, replace the local board.