77
OPERATING MANUAL
VERSION 05/2017 ORDER NUMBER DOC 2357061
8.5 SPRAYING MODE
8.5.1 PREREQUISITES
Optimum painting results are obtained if:
− The system parameters are set correctly.
− Product data such as the mixing ratio and pot life correspond to the working material.
− The ushing program is dened.
− The supply pressures are constant.
−
The A/B/C/D pressure ratio is set correctly (see Chapter 8.5.2).
− AIS is used.
Or without AIS: If the dosing valve (B side) is set using the valve stroke such that as many
cycles are undertaken as possible (depending on ow rate and mixing ratio every
0.5 - 2 seconds). See the operating manual for the valves (Order No. in Chapter 1.3.1).
− The product pumps can draw in the product perfectly and no cavitation occurs with
piston pumps (pump breaking through during down stroke). If necessary, the product
must be fed with a feed pump.
Optimum operation is fullled under the following conditions:
− When the ushing agent pressure for the ushing pumps as well as the product
pressure for the A, B and C pumps are always present on the device.
− When lling the mixed product in the product hose ensure that the nozzle is inserted
in the gun.
− When the ushing process is performed without the nozzle in the gun.
− When the levels in the product and ushing agent tanks are checked visually, in order
to prevent unintended interruptions in the spray process.
Prerequisites
−
At the start, all pumps must be lled with working material and the system must be
ready to start, as described in Chapter 6.6.5.
− The nozzle is inserted into the gun. Gun secured.
− Operating manuals for the aected components must be known.
− With an electrostatic gun:
Commissioning the electrostatics according to corresponding operating manual.
8.5.2 A/B/C/D PRESSURE RATIO
− Set the pressure ratio between base lacquer and hardener correctly. With a mixer:
B must be approx. 5–10% higher than A. C approx. 2–5% higher than B, D approx. 2–5%
higher than C.
− The pressure drop between pressure gauge and mixer can be dierently for A/B/C/D.
For longer distances, dierent ow rates and viscosities that may be relevant (e.g., for
external mixer or if the pressure gauges are at the pumps).
To Next Page
Loading...
Need help?
General