When selecting the components for our NITRA Compact Modular Valves, we need to first understand
the required communications and air pressures.
Let's start on the Left side of the system.
There are several different left supply/exhaust end plates and
determining communications to the valve configuration and system pressures will help determine which
plate to choose.
Let's discuss communications first: Will this be hard wired using the 25 pin D-sub or will
this be connected and communicated with EtherNet/IP?
If choosing Ethernet/IP, there are much less wires to deal with.
The system must have an Ethernet control device like a PLC to control the valves.
We have several How To videos on connecting these
Ethernet/IP modules to our AutomationDirect PLCs.
The Ethernet IP modules can be daisy chained by using one of our cables like this model.
Automation direct offers M12 ethernet cables in several
lengths with straight and ninety-degree connectors.
The number of ethernet modules daisy chained are
limited by the number of IP addresses in a subnet.
Don't forget to grab one of the communication ethernet cables and power cables for the ethernet
modules.
This cable connects from the control device to the first module on the communication drop.
Selecting the D-Sub connector style requires the connection of wires to the plate for each
valve.
While the plate is less money, the connection can
be more labor intensive
After we have selected our communications on the left hand modular plate, lets discuss
system pressures.
For example, if we selected the EtherNet/IP communications, there are still two end plates
to choose from: one push-to-connect, or two push-to-connect
fittings.
What is the difference?
If we want all valves to operate with a pressure between 45 and 100 psi, we should select the
CMV-E1X- 4X, with one push to connect fitting.
If we need to operate valves either at vacuum to 45 psi or 100 -145 psi, then we should
use the CMV- E2X-4X with two inlet ports.
This module will allow two valve inlet pressures: vacuum to 145 psi at ports
1 and 11 but also require a 45-100 psi pilot supply connected to port X.
If the system requires high air flow, there are several options to supply more inlet and
exhaust connections to the modular valve assembly.
We can simply add a CMV-C3X-5X right end plate.
Air supply or vacuum to 145 psi must be connected to
both ports 1 and 11.
There is also an exhaust port on this end plate.
We can add an intermediate module.
The CMV-D1X-3X adds an inlet at port 4 that will connect to the inlets of all valves in
the assembly.
Port 2 is an extra exhaust port that connects to
all valves.
This module can be added anywhere in the middle of the system.
The CMV-D2X-3X is a way to change the supply pressure to only the valves to the right of
this module.
It blocks the main inlet pressure coming from
the left side and allows a new supply to feed any valves
installed to its right.
Be sure to connect both ports 2 and 4 to supply.
The last intermediate module, the CMV-D3X-3X is simply an additional exhaust port for valves
installed to its right.
These give the system an additional exhaust when the exhaust air needs to be released
more quickly.
To build out the rest of the CMV system, we simply select the solenoids needed.
When adding valves to the assembly, it is important to count SOLENOIDS when figuring
system capacity.
Each modular assembly can support up to 16 solenoids.
Many of the individual valve units have two solenoids.
All of the CMV model 3-way valves are doubled-up in a valve unit to save space.
This means that each 3- way valve unit has two independent valves,
but it also means that each 3-way unit has two solenoids.
These double 3-way units are available with two normally closed, two normally opened,
or one normally closed and one normally opened valves.
With so many options in our CMV series, you will save time, space and money.
Optional accessories include DIN rail mounting brackets and replacement
screws and gaskets.
Don't forget, we sell pneumatic fittings, tubing, air cylinders
pressure sensors and more!
If you have any questions about using AutomationDirect's NITRA pneumatics, please contact
AutomationDirect's free award-winning support team during regular business hours.
They will be happy to help.
Click on this short video to learn more about AutomationDirect's support options and click
here to learn more or see more videos on the NITRA
products.
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