Graco ProMix PD2K Operation page 42

Operation Using a Programmable Logic Controller (PLC)
Operation Flow Flow Charts
Operation Operation Flow
NOTE: NOTE: All flow charts reference registers for Mix Unit NOTE:
#1. For Mix Unit #2, reference the Network Maps for
corresponding register indices.
Purge Mode Mode Sequence Sequence
Purge Purge Mode Sequence
System opens color solvent valve at remote stack to allow
solvent flow through mix manifold and out gun.
Purge time set according to the flush sequence assigned to
System Mode = Standby: Mix Not Ready
System closes color solvent valve at remote stack.
42
Charts
Charts
Purge A System Command
Write '6' to Input Re gis te r 00
Is Mix Unit #1 in Standby or
Pumps Of f?
System Mode = Purge A
(Output Register 00 = '9')
material A in re cipe .
Is solvent flow switch 1 ON?
Purge time expired?
(Output Register 00 = '13')
NOTE: Purge B command works
similarly with the catalyst lines and
solvent flow switch 2.
No action taken.
Either pumps are currently
running or an alarm condition
exists.
NO
Purge no flow timeout expired?
No solvent flow detected.
Generate alarm.
3A4486D