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2.1.2. Common Cause Failure – CCF
The product has been engineered and manufactured according to the fundamental and
proven safety principles of ISO 1389-1 and -2.
Critical failure modes and causes:
• Incomplete reversal - caused by incomplete return of solenoid valve B.
• The pressure applied at port (4) not being dissipated - caused by incomplete return
of solenoid valve A.
• Failure of the safety function - caused by simultaneous incomplete return of both
solenoid valves (A and B).
Common Cause Failures (CCF) are failures of different components, resulting from
a single event. CCF are not to be confused with cascading faults or common mode
faults. Common cause failures can cause loss of the safety function, especially in dual
channel circuits where both channels could fail simultaneously due to a single event.
•
Maintain compressed air quality, i.e., filtration, pressure regulation, lubrication.
•
Avoid compressor oils that can cause valve seals to swell, soften, or otherwise
deteriorate.
•
Operate within prescribed temperature limits.
•
Install the valve such that the normal stroke travel of the valve elements are
perpendicular to the main direction of machine vibration and/or mechanical shock.
•
Do not use a test pulse longer than allowed by the Technical Specifications.
•
Avoid external magnetic fields.
•
Do not plug the valve exhaust port.
•
Use only high-flow, non-clogging silencers, with similar or higher specifications as
ROSS
®
silencers.
2.1.3. Diagnostic Coverage
A diagnostic coverage of 99% is achievable through appropriate integration of the RSe
Series valve into the safety control system. The monitoring system must check for
the proper change of state of each valve sensor (S1 & S2) with each change of state
of the safety control system outputs to the valve solenoids (Sol 1 & Sol 2). Detection
of a fault by the safety control system must trigger a shut-off of the safety controller's
outputs to the valve solenoids (Sol 1 & Sol 2). See section 8.
NOTE: On 5/2 versions, in the event of a fault where the side A valve element is de-
actuated and the side B valve element sticks within a very small, specific range of its
travel, there is a possibility of a condition where pressure may not be present in port 2.
This fault is detectable because one position sensor's output will be high (on) and the
other sensor's output will be low (off).
WARNING: On 5/2 versions, in the event of loss of pressure in port 2 during a fault
could cause unexpected movement of a cylinder that is being controlled by the valve.
2.1.4. Fault Modes
Note that normal operation requires that Sol 1 & Sol 2 be energized simultaneously
for switching the RSe Series valve on, and de-energizing both Sol 1 and Sol 2
simultaneously for switching the RSe Series valve off. Faults that could occur during
normal operation:
Sol 1 & Sol 2 energized simultaneously
S1 ON, S2 OFF
S1 OFF, S2 ON
S1 OFF, S2 OFF
Sol 1 & Sol 2 de-energized simultaneously
S1 ON, S2 OFF
S1 OFF, S2 ON
S1 ON, S2 ON
2.1.5. Foreseeable Misuse
Risk of Injury!
Misuse may result in injury or damage.
f The product must be used exclusively as intended.
Foreseeable misuse includes:
•
Use outdoors
•
Bypassing the safety function or diagnostics
•
Failing to utilize the onboard sensors to verify valve operation on every cycle –
energizing and de-energizing
•
Allowing continued operation of the valve when one or both valve shifted signals
(from position sensors) are not confirmed.
•
Use in reverse operation (reversal of supply and exhaust air)
•
Operation in low-demand mode per IEC 61508
•
Operating at pressures below minimum operating pressure or above maximum
operating pressure.
2.3. Responsibilities of the System Owner
Observe the information on assembly and operating conditions listed in the
•
operating instructions or the data sheet.
4
WARNING
•
Comply with the further requirements of ISO 13849 (e. g., CCF, DC, PLr, software)
if you intend to use the product in higher categories (2 to 4).
•
Make sure that the maximum number of switching cycles (B
life T
is not exceeded. If the expected number of switching cycles for a component
M
exceeds the B
value during its period of use, suitable replacement intervals
10D
have to be specified.
•
Switch the valve at least once a month to ensure its proper operation.
•
Make sure that the fundamental and proven safety principles in accordance with
ISO 13849 for implementation and operation of the component are complied with.
•
Make sure that the permissible switch-on and switch-off pulses for feedback-free
operation of the pneumatic devices are observed.
•
If you operate the RSe Series valve together with an electric two-hand control, it
must comply with the EN 574 standard. Selection and installation of this two-hand
control must take place in accordance with the manufacturer's specifications.
2.4. Safety Instructions
•
When implementing surge suppression measures, be sure to check whether or
not this extends the valve shut off response time which could extend the machine
stopping time.
•
In case of high levels of machine vibration, use appropriate vibration-reducing
elements when installing the valve.
•
Supply the proper voltage as overvoltage situations can result in solenoid burnout.
•
Make sure that the silencer's flow capacity is not restricted as this could affect
system performance.
•
If required, replace the silencer with a model equivalent or higher in specifications
as ROSS
silencers.
®
3. Product Identification
Date of manufacture and site of manufacture are permanently stamped:
Manufacturing site
Site abbreviation
ROSS CONTROLS USA
(L)
ROSS EUROPA
(G)
ROSS UK
(RB)
ROSS ASIA
(J)
ROSS SOUTH AMERICA
(B)
ROSS CONTROLS CHINA
(C)
ROSS CONTROLS INDIA
(RCI)
See back page for ROSS addresses.
Product label identification & product key identification example, see page 2.
4. Prerequisites for Use of the Product
f Make these operating instructions available to the engineer and assembly
technician of the machine/system in which the product will be used.
f Keep these operating instructions for the entire product life cycle.
4.1. Qualified Personnel
Assembly, installation, commissioning, maintenance, and decommissioning should
only be carried out by qualified personnel that have the required knowledge of and
experience in dealing with electrical and pneumatic control technology.
5. Package Contents
Items included:
•
RSe valve •
•
Operating instructions
6. Service, Repair, and Maintenance
f In case of technical problems or a required repair, please contact your local ROSS
representative. If used properly, the RSe valves will not require maintenance.
Unless otherwise required, ROSS
least once a month (see 8.1 Test Procedure).
7. Assembly and Installation
Risk of injury due to installation while pressurized or with live parts!
Installation while pressurized or with electrical power switched on can result in injuries
due to sudden pressure build-up or electric shock.
f De-energize and de-pressurize the relevant system parts before installing the valves.
f Secure the system to prevent it being switched back on again.
RSe Series Operating Instructions
) within the service
10D
Valve printing
(example May 2016)
(5 16 L)
(5 16 G)
(5 16 RB)
(5 16 J)
(5 16 B)
(5 16 C)
(5 16 RCI)
®
recommends performing a functional test at
CAUTIONS
www.rosscontrols.com
®
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