422.x Powder: insufficient startup current
Description
The minimal cascade current could not be reached during start-up of production.
Remedy
- Clean coating chamber and electrodes.
- Check the electrode purge air.
- If there is no purge air: check purge air tubes D=3 mm between CPF and spray arm.
- Set the high voltage (powder: maximum voltage setpoint) to 40 kV
- Check wiring: HVS card to cascade, see the HVS troubleshooting instructions.
If the current is 0 uA but the high voltage is at maximum, either the Ground-Sense or the Current-Sense hardware line is interrupted or short-circuited. See the diagram and the HVS troubleshooting instructions. - Measure the voltage with a high-voltage measuring instrument (see the HVS troubleshooting instructions); if the voltage in the electrode is too low, replace the cascade.