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 flushing program is defined.
− The supply pressures are constant.
− The A/B/C/D pressure ratio is set correctly (see Chapter
).
− 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 flow rate and mixing ratio every
0.5 - 2 seconds). See the operating manual for the valves (Order No. in Chapter
).
− 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 fulfilled under the following conditions:
− When the flushing agent pressure for the flushing pumps as well as the product
pressure for the A, B and C pumps are always present on the device.
− When filling the mixed product in the product hose ensure that the nozzle is inserted
in the gun.
− When the flushing process is performed without the nozzle in the gun.
− When the levels in the product and flushing agent tanks are checked visually, in order
to prevent unintended interruptions in the spray process.
Prerequisites
− At the start, all pumps must be filled with working material and the system must be
ready to start, as described in Chapter
− The nozzle is inserted into the gun. Gun secured.
− Operating manuals for the affected 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 differently for A/B/C/D.
For longer distances, different flow rates and viscosities that may be relevant (e.g., for
external mixer or if the pressure gauges are at the pumps).
