Ransburg MMA-303 Direct_Ind Charge Atomizer A12870 - Manual (Page 102)

MMA-303 Direct/Indirect Charge - Maintenance
99 LN-9269-11.3
General Problem Possible Causes Corrective Action
Speed Feedback 1. Damaged fiber optic cable 1. Repair or replace the fiber optic cable.
Fault
between robot plate and con-
trol panel
2. Connection at robot or bell 2. Reinstall cable and tighten locking set screw.
plate is loose
3. Fiber optic transmitter failure 3. Replace fiber optic transmitter.
4. Bad transceiver module 4. Replace transceiver module.
5. Excessive vibration 5. a. Check bell cup for damage.
b. Check bell cup for excessive paint buildup.
c. Ensure bell cup is tightened properly.
d. Check cup and shaft tapers for cleanliness.
No Fluid Flow 1. Turbine is not rotating 1. Verify rotation of turbine (the paint valve air
pilot must be interlocked with the turbine
speed feed back signal to ensure that paint
does not flow into the air bearing).
2. Fluid valve does not actuate 2. a. Verify that air pilot signal is present.
b. Fluid valve air pilot signal is too low.
Increase air pressure to 70 psig (482.6 kPa)
minimum.
c. Replace fluid valve.
3. Clogged fluid tube 3. Remove and inspect fluid tube.
4. Bad transceiver module 4. Replace transceiver module.
Continuous Fluid
Flow
1. Fluid valve open 1. a. Remove air pilot signal.
2. Fluid valve seat damaged or b. If still open, replace fluid valve.
worn 2. Inspect and retighten.
Uncontrollable Fluid 1. Insufficient back pressure to 1. Replace fluid tube with the next smaller
Flow fluid regulator inner diameter size.
2. Fluid regulator does not con-
trol
2. Disassemble fluid regulator and inspect for
flow (system) paint and solvent.
Troubleshooting Guide — Direct Charge (Cont.)