Operation Using a Programmable Logic Controller (PLC)
Operation
Operation
Operation Using
Using
Using a
a
a Programmable
Programmable
Programmable Logic
Logic
Logic Controller
Controller
Controller (PLC)
(PLC)
(PLC)
Network
Network
Network Communications
Communications
Communications and
and
and
Discrete
Discrete
Discrete I/O
I/O
I/O
The ProMix PD3K+ Automatic system does not use
a Booth Control module. Instead, it uses Network
Communications and has optional Discrete I/O
features to drive the system remotely.
Some automation control elements of the
ProMix PD3K+ can be driven by a discrete
input
or
network communications. These
options need to be configured at the ADM (see
). The following features
can be set to ‘Discrete’ or ‘Network’:
• Flow
Flow
Flow Control
Control
Control – Means of adjusting the control set
point (see Flow
Flow
Flow Control
Control
Control Set
Set
Set Point
Point
Point below).
• Gun
Gun
Gun Trigger
Trigger
Trigger – Means of signaling the ProMix
PD3K+ when the spray device is triggered.
NOTE:
NOTE:
NOTE: The Manual Override check box enables a
user to operate the system before the automation
(PLC) is available. Manual Override can be used to
run all functions of the system if a proper gun trigger
signal is provided. It is not intended to be the main
mode of control. Graco recommends that Manual
Override be disabled during normal operation to
avoid driving the system in a way that conflicts with
the automation sequence.
Discrete
Discrete
Discrete I/O
I/O
I/O
The ProMix PD3K+ does not supply power for
Discrete I/O. A clear understanding of these inputs
is necessary to properly integrate the ProMix PD3K+
with the PLC or networking device. Input and output
connections are made at the Discrete I/O terminal
strips on the Enhanced Fluid Control Module (EFCM)
inside the control box.
Table 3 and Figure 12 show where discrete I/O
connections are made on the ProMix PD3K+.
Table
Table
Table 3
3
3 PD3K+
PD3K+
PD3K+ Discrete
Discrete
Discrete I/O
I/O
I/O Connections
Connections
Connections
I/O
Description
EFCM
Connector
Pins
Type
Gun Trigger
Input
6
1,2
Normally Open
Contact
Control Set
Point
7
1,2
4-20 mA Input
Safety
Interlock
Input
7
11,12
Normally Open
Contact
Digital
Digital
Digital Inputs
Inputs
Inputs
• Safety
Safety
Safety Interlock
Interlock
Interlock: This normally open contact works
like a soft emergency stop button. If the ProMix
PD3K+ reads the input as CLOSED it interrupts
system operation and removes power from the
pumps regardless of the current operating mode.
If the input is read as OPEN, the system operates
normally
NOTE:
NOTE:
NOTE: This digital input is always enabled.
Do not toggle this input to put the system into
Standby mode.
• Gun
Gun
Gun Trigger
Trigger
Trigger: This normally open (maintained)
contact provides a signal to the system to indicate
whether or not a spray device is triggered. This
input provides timing for alarm functions and also
drives the flow control algorithm. If the input is
OPEN the system operates as though the spray
device is off. The input must be maintained
CLOSED to signal that the spray device is
triggered.
NOTE:
NOTE:
NOTE: The Gun Trigger discrete input must be
enabled via
on the
ADM. If it is set to ‘Network’ the discrete input
is ignored and the spray device trigger signal is
handled via the network communications.
If enabled, it is imperative that this signal be sent
any time the spray device is triggered. Without the
signal, the flow control features will not work.
Analog
Analog
Analog Inputs
Inputs
Inputs
Flow
Flow
Flow Control
Control
Control Set
Set
Set Point
Point
Point: When enabled, this 4-20mA
signal input is used to set and adjust the operating
flow control set point. The ProMix PD3K+ scales the
set point linearly from 0 to the Max Set Point setting
(see
).
Examples
,
• In
In
In Flow
Flow
Flow Control
Control
Control Mode:
Mode:
Mode: If the Max Set Point is 500
cc/min, a 4mA signal is 0 cc/min and a 20mA signal
is 500 cc/min.
• In
In
In Pressure
Pressure
Pressure Control
Control
Control Mode:
Mode:
Mode: If the Max Set Point is
500 psi, a 4mA signal is 0 psi and a 20mA signal
is 500 psi.
NOTE:
NOTE:
NOTE: The Flow Control discrete input must be
enabled via
on the ADM.
If set to ‘Network’ the discrete input is ignored and
set point adjustment is handled via the network
communications.
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