Ross Controls M DM2 C Series User manual

M DM2®Series C
Double Valve with Integrated Soft Start
Pneumatic equipment should be installed only by persons
trained and experienced in such installation.
Air Lines: Before installing this valve in a new or existing
system, the air lines must be blown clean of all contaminants. It
is recommended that a 5-micron rated air filter be installed in the
inlet line close to the valve.
Valve Inlet (Port 1): Be sure that the supply line is of adequate
size and does not restrict the air supply because of a crimp in the
line, a sharp bend, or a clogged filter element. The air supply must
not only provide sufficient pressure (see Standard Specifications,
page 3), but must also provide an adequate flow of air on demand.
Otherwise, the valve elements will be momentarily starved for air
and the valve may fail to operate.
Valve Outlet (Port 2): For faster pressurizing and exhausting of
the mechanism being operated by the valve, locate the valve as
close aspossible tothe mechanism. The linesmust beof adequate
size and be free of crimps and sharp bends.
Valve Exhaust (Port 3): Do not restrict the air flow from
the exhaust port as this can adversely affect the operation of
the valve. The valves are factory equipped with a properly sized
silencer. ROSS MUFFL-AIR® silencers reduce impact noise by
as much as 25 dB, and produce little back pressure.
Reset Solenoid: M DM2® Series C double valves are supplied
with a 3/2 normally closed solenoid valve for reset purposes.
Electrical reset signal must be momentary and of correct voltage.
Electrical Supply: M DM2® Series C double valves get electrical
power through plug-in connectors. The electrical supply must
correspond to the voltage and hertz ratings of the solenoids.
Otherwise, the solenoids are subject to early failure. If power
is supplied by a transformer, it must be capable of handling the
inrush current without significant voltage drop. See Standard
Specifications on page 3 for current data.
Operating Pressures and Temperatures: Allowable ranges
for pressure and temperatures are given in the Standard
Specifications on page 3. Exceeding these values can adversely
affect performance and shorten valve life.
Pipe Installation: To install pipe in ports, engage pipe one turn,
apply pipe thread sealant (tape not recommended), and tighten
pipe. This procedure will prevent sealant from entering and
contaminating the valve. To install pipe with parallel threads (e.g.,
SAE, ISO 228-G, etc.) do not use sealant.
Test: After installation or repair and prior to normal use, the
internal lockout feature of the M DM2®
Series C double valve must
be tested for proper functioning. Observe normal equipment
operation safety precautions during these tests to avoid personal
injury or damage to equipment.
NOTE: Reset may need to be performed prior to beginning the
test procedure. Also, the valve is designed such that both pilot
solenoids must be de-energized prior to reset, and must remain
de-energized until after the reset signal is removed. Otherwise,
the valve will not reset.
A) Electrically energize both pilot solenoids simultaneously, then
de-energize onepilot solenoid. This shouldresult ina valve lockout
and prevent the valve from operating.
B) Energize both solenoids and the valve should remain in the
lockout condition.
C) De-energize both pilot solenoids and reset the valve.
D) Electrically energize both pilot solenoids simultaneously again.
De-energize the other pilot solenoid this time. Again, this should
result in a lockout.
E) Energize both pilot solenoids. The valve should remain in a
lockout condition.
F) De-energize both pilot solenoids and then reset the valve.
After satisfying these tests, energizing both pilot solenoids
simultaneously should result in normal operation.
Fault Indication: The built-in status indicator can be used
to signal the machine controls that a fault has occurred. The
status indicator utilizes a pressure switch. The pressure switch
has 4 electrical contacts. During normal operation the pressure
switch is pressurized. A lockout condition depressurizes the
switch until the valve is reset. Pins 1 and 4 are closed when
the switch is depressurized (normally closed) and pins 1 and
2 are closed when an adequate pressure signal is applied to
the switch (normally open).
You have purchased a premium-quality ROSS®pneumatic valve.
It is a high quality M DM2® Series C control reliable double valve with
integrated soft start for Category 4 applications (except press clutch/
brake applications). The valve is designed for base mounting for ease of installation and maintenance. With
care in its installation and maintenance you can expect it to have a long and economical service life. Before
you install this valve, read the information in this folder completely, and save it for future reference.
NOTE: This valve is expressly not intended for use in press clutch/brake applications.
ROSS produces the DM2® Series D and a number of other double valve configurations specifically for use with
press clutch/brake applications.
VALVE INSTALLATION
Thank You!
ROSS CONTROLS®www.rosscontrols.com
Please read and make sure you understand all installation instructions before proceeding with the installation.
Additional technical documentation is available for download at www.rosscontrols.com.
If you have any questions about installation or servicing your valve, please contact ROSS or your authorized ROSS
distributor, see contact information listed at the back of this document, or visit www.rosscontrols.com to find your distributor.

VALVE MAINTENANCE
COMPATIBLE LUBRICANTS
Maker Brand Name
Amoco............ American Industrial Oil 32; Amoco
Spindle Oil C; Amolite 32
Citgo .............. Pacemaker 32
Exxon ............. Spinesstic 22; Teresstic 32
Mobil............... Velocite 10
Non-Fluid Oil .. Air Lube 10H/NR
Shell ............... Turbo T32
Sun................. Sunvis 11; Sunvis 722
Texaco............ Regal R&O 32
Union.............. Union Turbine Oil
2ROSS CONTROLS®
VALVE OPERATION
On first operation, or after repair, the pilot valve supply circuit and
inherent monitoring elements may need to be reset. This reset
is accomplished by energizing the reset solenoid momentarily.
After reset, the valve will then be ready for operation.
The air supply to each pilot valve is controlled by the position
of the inlet poppets. In the ready-for-operation position these
poppets are held on their seats and maintain pilot air flow.
During shifting of the valve elements the poppets move off seat
and momentarily allow pilot air to escape to exhaust. If either
valve element fails to operate correctly, the pilot supply to the
other valve element will remain connected to exhaust causing
the valve to lockout.
The internal monitoring system will lock out the valve if the
time difference between both elements shifting fully is longer
than approximately 125 milliseconds. This timing is preset by
restricting-orifices and chambers in the pilot air circuit.
The main airflow from port 1 to port 2 is via crossflow passages
between both main valves, so that both valve elements must be
fully shifted in order for port 2 to be pressurized.
If the valve locks out, further operation is prevented until the valve
has been reset. Electrical signals to the solenoids must be "off"
to allow the valve to be reset.
The M DM2® Series C valve is completely self-contained and
does not need an external monitoring system.
The M DM2® Series C valve also contains an EEZ-ON®function
that will allow outlet pressure to increase at a slower than normal
rate until it reaches approximately 60% of inlet pressure. The time
it takes for the outlet pressure to reach approximately 60% of inlet
pressure can be changed by adjusting the flow control in the inlet
flange. Turning the flow control clockwise will increase the time.
Turning the flow control counter-clockwise will reduce the time.
Pneumatic equipment should be maintained only by persons trained
and experienced in the maintenance of such equipment.
Supply Clean Air. Foreign material lodging in valves is a major cause
of breakdowns. The use of a 5-micron-rated air filter located close to
the valve is strongly recommended. The filter bowl should be drained
regularly, and if its location makes draining difficult, the filter should be
equipped with an automatic drain.
Check Lubricator Supply Rate. A lubricator should put a fine oil mist
into the air line in direct proportion to the rate of air flow. Excessive
lubrication can cause puddling in the valve and lead to malfunctions.
For most applications an oil flow rate in the lubricator of one drop per
minute is adequate. Note that the double valve itself does not require
air line lubrication.
Compatible Lubricants. Although this valve does not require air line
lubrication, it may be used with lubricated air being supplied to other
mechanisms. Some oils contain additives that can harm seals or other
valve components and so cause the valve to malfunction. Avoid oils with
phosphate additives (e.g., zinc dithiophosphate) and diester oils; both
types can harm valve components. The best oils to use are generally
petroleum base oils with oxidation inhibitors, an aniline point between
180°F (82°C) and 220°F (104°C), and an ISO 32 or lighter viscosity.
Some compatible oils are listed at the right. These oils, although believed
to be compatible, could change without notice because manufacturers
sometimes reformulate their oils. Therefore, use oils specifically
compounded for air line service. If it is a synthetic oil, contact the oil
manufacturer for compatibility information.
Cleaning the Valve. If the air supplied to the valve has not been well
filtered, the interior of the valve may accumulate dirt and varnish which
can affect the valve's performance.
A schedule should be established for cleaning all valves, the frequency
depending on the cleanliness of the air being supplied.
To clean the valve, use any good commercial solvent.
Do not scrape varnished surfaces. Also, do not use
chlorinated solvents or abrasive materials. The former
damages seals, and abrasives can do permanent
damage to metal parts. Before reassembling the valve,
lubricate all sliding surfaces with a grease such as Dow
Corning BR 2 Plus.
Electrical Contacts. In the electrical circuits
associated with the valve solenoids, keep all switches
or relay contacts in good condition to avoid solenoid
malfunctions.
Replace Worn Components. In most cases it is not
necessary to remove the valve from its installation for
servicing. However, turn off the electrical power to the
valve, shut off the air supply, exhaust the air in the
system, and lockout before beginning any disassembly
operation. Service kits are listed on page 3.
GRAY
(Equip. Ground)
WHITE
(N.O.
Status Contact)
BROWN
(+24 Volts DC)
BLUE
(Common)
5 Pin “A” Code Female Connector
BLACK
(N.C. Status Contact)
12
5
43
GRAY
(Reset)
WHITE
(Sol 2)
BROWN
(+24 V
olts DC)
BLACK
(Sol 1)
BLUE
(Common)
5 Pin “A” Code Male Connector
21
5
34
Valve Wiring
Solenoid Reset: Energize solenoid momentarily
to reset valve after lock-out condition occurs.
NOTE: The valve is designed such that both pilot
solenoids must be de-energized prior to reset, and
must remain de-energized until after the reset signal
is removed. Otherwise, the valve will not reset.

www.rosscontrols.com 3
STANDARD SPECIFICATIONS
VALVE SERVICE
Construction: Dual Poppet.
Mounting Type: Base mounted.
Pilot Solenoids: According to VDE 0580. Enclosure rating
according to DIN 400 50 IP 65. Three solenoids, rated for
continuous duty.
Standard Voltages: 24 volts DC.
Pilot Solenoids Power Consumption (each solenoid):
For primary and reset solenoids: 1.2 watts on DC.
Enclosure Rating: IP65, IEC 60529.
Solenoid & Status Indicator Connection:
M12, 5-pin Male Receptacle, A-Coded.
Ambient Temperature: 15° to 122°F (-10° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered, lubricated or unlubricated (mineral oils
according to DIN 51519, viscosity classes 32-46); 5-micron
recommended.
Inlet Pressure: 30 to 150 psig (2 to 10.3 bar). Under certain
circumstances, such as maximum restriction of the adjustable
flow control or a very large downstream system volume, the
minimum inlet pressure may need to be set up to 60 psig (4 bar)
to prevent nuisance valve faults.
Pressure Switch (Status Indicator) Rating: 5 amps at 30
volts DC.
Monitoring: Dynamically, cyclically, internally during each
actuating and de-actuating movement. Monitoring function has
memory and requires an overt act to reset unit after lockout.
Mounting orientation: Vertically with pilot solenoids on top.
Functional Safety Data: Category 4 PL e; B10D: 20,000,000;
PFH D : 7.71x 10 -9 ; MTTFD: 301.9 (nop: 662400).
Certifications: CE Marked for applicable directives, BG, CSA/
UL, TSSA for appropriately tested valves.
Vibration/Impact Resistance: Tested to BS EN 60068-2-27.
ROSS would be happy to service this valve for you at its factory repair center. If you purchased your valve from
ROSS please contact ROSS customer service, if you purchased your valve thru an authorized ROSS distributor
please contact the distributor for return instructions.
However, if you choose to service this valve yourself, it is strongly recommended that you visit our website at
www.rosscontrols.com for available downloadable technical documentation.
When servicing the valve yourself, be sure to turn off electrical power to the valve, shut off the air supply, exhaust the
air in the system, and lock-out all power sources before beginning any disassembly operation. Listed below are kits for
servicing M DM2® Series C double valves, as well as replacement solenoid information.
CAUTION: Before operating the M DM2® Series C double valve, be sure to complete the test procedure (TEST), on page
1, upon installation and after any maintenance is performed on the valve. Failure to do so could result in
personal injury or equipment damage.
If you have any questions about installing or servicing your valve, call ROSS Technical Services at your nearest ROSS
location (see page 4) or in the U.S.A. at: 1-888-TEK-ROSS(835-7677).
IMPORTANT NOTE: Please read carefully and thoroughly all the CAUTIONS and WARNINGS on page 4.
BROWN
Input
Power +
GREY
Power Input
WHITE
Digital
Output Signal
BLUE
Digital
Output 2 Signal
BLACK
Analog
Output Signal
12
3
4
5
Optional Digital Pressure Transducer
Model Number 2447H77
Wiring Kits
Kit Number Description
2431H77 Wiring Kit - 5 meters (16.4 feet), 5-pin, 22-gauge conductors
Includes two cords, and the cord grips.
2432H77 Wiring Kit with Transducer - 5 meters (16.4 feet).
Includes three cords. and the cord grips.
Solenoid Coils (main and reset)* * 3 solenoid coils required.
Part Number 2466H77
Service / Replacement Parts Kits Kit Number Description
Valve Body Service Kits 2430H77
These kits contain all parts needed for complete
reconditioning of a valve body. Included are poppets,
spindles, gaskets, seals, and instructions for use.
Status Indicator Assembly Service Kit 2444H77 This kit includes all parts needed for complete
reconditioning of the status indicator assembly.
Pressure Switch Replacement 2445H77 This kit includes a replacement pressure switch and
electrical connector for the status indicator assembly.

PRE-INSTALLATION or SERVICE
1. Before servicing a valve or other pneumatic component, be sure
that all sources of energy are turned off, the entire pneumatic system
is shut off and exhausted, and all power sources are locked out (ref:
OSHA 1910.147, EN 1037).
2. All ROSS®products, including service kits and parts, should
be installed and/or serviced only by persons having training and
experience with pneumatic equipment. Because any installation can be
tampered with or need servicing after installation, persons responsible
for the safety of others or the care of equipment must check every
installation on a regular basis and perform all necessary maintenance.
3. All applicable instructions should be read and complied with before
using any fluid power system in order to prevent harm to persons
or equipment. In addition, overhauled or serviced valves must be
functionally tested prior to installation and use. If you have any
questions, call your nearest ROSS location listed in the table below.
4. Each ROSS product should be used within its specification limits.
In addition, use only ROSS parts to repair ROSS products.
WARNINGS: Failure to follow these directions can adversely affect
the performance of the product or result in the potential
for human injury or damage to property.
FILTRATION and LUBRICATION
5. Dirt, scale, moisture, etc. are present in virtually every air system.
Although some valves are more tolerant of these contaminants than
others, best performance will be realized if a filter is installed to clean
the air supply, thus preventing contaminants from interfering with the
proper performance of the equipment. ROSS recommends a filter
with a 5-micron rating for normal applications.
6. All standard ROSS filters and lubricators with polycarbonate
plastic bowls are designed for compressed air applications only. Do
not fail to use the metal bowl guard, where provided, to minimize
danger from high pressure fragmentation in the event of bowl failure.
Do not expose these products to certain fluids, such as alcohol or
liquefied petroleum gas, as they can cause bowls to rupture, creating
a combustible condition, hazardous leakage, and the potential for
human injury or damage to property. Immediately replace a crazed,
cracked, or deteriorated bowl. When bowl gets dirty, replace it or
wipe it with a clean dry cloth.
7. Only use lubricants which are compatible with materials used in
the valves and other components in the system. Normally, compatible
lubricants are petroleum based oils with oxidation inhibitors, an
aniline point between 180°F (82°C) and 220°F (104°C), and an ISO
32, or lighter, viscosity. Avoid oils with phosphate type additives
which can harm polyurethane components, potentially leading to
valve failure which risks human injury, and/or damage to property.
AVOID INTAKE/EXHAUST RESTRICTION
8. Do not restrict the air flow in the supply line. To do so could reduce
the pressure of the supply air below the minimum requirements for
the valve and thereby cause erratic action.
9. Do not restrict a valve’s exhaust port as this can adversely affect
its operation. Exhaust silencers must be resistant to clogging and
must have flow capacities at least as great as the exhaust capacities
of the valves. Contamination of the silencer can result in reduced
flow and increased back pressure.
WARNINGS:
ROSS expressly disclaims all warranties and responsibility for any
unsatisfactory performance or injuries caused by the use of the
wrong type, wrong size, or an inadequately maintained silencer
installed with a ROSS product.
POWER PRESSES
10. Mechanical power presses and other potentially hazardous
machinery using a pneumatically controlled clutch and brake
mechanism must use a press control double valve with a monitoring
device. A double valve without a self-contained monitoring device
should be used only in conjunction with a control system which
assures monitoring of the valve. All double valve installations involving
hazardous applications should incorporate a monitoring system which
inhibits further operation of the valve and machine in the event of a
failure within the valve mechanism.
ENERGY ISOLATION/EMERGENCY STOP
11. Per specifications and regulations, ROSS L-O-X® valves
and L-O-X® valves with EEZ-ON® operation are defined as energy
isolation devices, NOT AS EMERGENCY STOP DEVICES.
STANDARD WARRANTY
All products sold by ROSS CONTROLS are warranted for a one-year period [with the exception of
all Filters, Regulators and Lubricators (“FRLs”) which are warranted for a period of seven years]
from the date of purchase to be free of defects in material and workmanship. ROSS’ obligation
under this warranty is limited to repair or replacement of the product or refund of the purchase price paid solely at the discretion of ROSS
and provided such product is returned to ROSS freight prepaid and upon examination by ROSS is found to be defective. This warranty
becomes void in the event that product has been subject to misuse, misapplication, improper maintenance, modification or tampering.
THE WARRANTY EXPRESSED ABOVE IS IN LIEU OF AND EXCLUSIVE OF ALL OTHER WARRANTIES AND ROSS EXPRESSLY DISCLAIMS
ALL OTHER WARRANTIES EITHER EXPRESSED OR IMPLIED WITH RESPECT TO MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. ROSS MAKES NO WARRANTY WITH RESPECT TO ITS PRODUCTS MEETING THE PROVISIONS OF ANY GOVERNMENTAL
OCCUPATIONAL SAFETY AND/OR HEALTH LAWS OR REGULATIONS. IN NO EVENT IS ROSS LIABLE TO PURCHASER, USER, THEIR
EMPLOYEES OR OTHERS FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM A BREACH OFTHE WARRANTY
DESCRIBED ABOVE OR THE USE OR MISUSE OF THE PRODUCTS. NO STATEMENT OF ANY REPRESENTATIVE OR EMPLOYEE OF
ROSS MAY EXTEND THE LIABILITY OF ROSS AS SET FORTH HEREIN.
ROSSCONTROLS USA Tel: [phone] web site: www.rosscontrols.com
ROSS EUROPA GmbH Germany Tel: [phone] web site: www.rosseuropa.com
ROSS ASIA K.K. Japan Tel: [phone] web site: www.rossasia.co.jp
ROSS UK Ltd. UK Tel: [phone] web site: www.rossuk.co.uk
ROSS SOUTH AMERICA Ltda. Brazil Tel: [phone] email: [email protected]
ROSS CONTROLS INDIA Pvt. Ltd. India Tel: [phone] email: [e-mail]
ROSS CONTROLS (CHINA) Ltd. China Tel: [phone] web site: www: rosscontrolschina.com
ROSS FRANCE S.A.S. France Tel: [phone] web site: www.rossfrance.com
ROSS CANADA Canada Tel: [phone] (416-251-ROSS) web site: www.rosscanada.com
(6077170 CANADA INC. AnIndependent RepResentatIve)
CAUTIONS And WARNINGS
Printed in the U.S.A. – Rev. 05/17 © 2017, ROSS CONTROLS®. All Rights Reserved. Form SS305
Content subject to change.