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  1. srini1785

    IP65 PROTECTION CLASS FOR NON ELECTRICAL EQUIPMENT

    Worked perfectly before and after the test. However it was not accepted as it not as per "Specs".
  2. srini1785

    IP65 PROTECTION CLASS FOR NON ELECTRICAL EQUIPMENT

    Yes. It has failed testing.
  3. srini1785

    IP65 PROTECTION CLASS FOR NON ELECTRICAL EQUIPMENT

    Thank you for the replies. Some clarifications. 1. The valve is used in Railway pantograph and cannot be relocated anywhere else. Its is exposed to the elements 24x7. 2. This valve controls the maximum height that the panto can reach. I've tried to educate the customer but then again it...
  4. srini1785

    IP65 PROTECTION CLASS FOR NON ELECTRICAL EQUIPMENT

    Hi, Does the IP65 protection class apply to Non - electrical equipment too? I have a Pure pneumatic valve (3/2 single plunger operated) which has no electrical component. Our customer wants it IP65 rated. There is very little room for modification to make it water or dust tight (actually we...
  5. srini1785

    VIBRATION TEST FIXTURE.

    Few points to clarify now. The design is changed. We've now incorporated two gussets, M6 nuts (Cheese head with Allen nuts) 8 nos for each surface, more number of holes for mounting on the table. Further, the thread will be only on one mating part with the other having a through hole and a...
  6. srini1785

    VIBRATION TEST FIXTURE.

    Yes, countersunk screws
  7. srini1785

    VIBRATION TEST FIXTURE.

    Thank all members for your suggestions. Some clarifications. 1. The General Design is as given below. 2. The vibration test is done through an external lab and the dimensions of the bench are as follows. XY Table Z Table 3. I've dropped the idea of welded plates based on your...
  8. srini1785

    VIBRATION TEST FIXTURE.

    Hello, I am aware that there are threads which discuss this topic but there are some specifics which i wanted to share in this thread. 1. Specimen : Pneumatic Panel 448x187mm with 3mm R4 bend. Aluminium, 3mm sheet thickness. 2. Test Standard : IEC 61373 HL2 2. Weight 3Kgs (approx.) 4...
  9. srini1785

    My pneumatic cylinder needs to push down 25% of its capacity at the start and then push with 100%.

    Two solutions come to my mind. 1. Use a 5/2 way valve with port 1 connected to a I/P converter. You can set the output pressure using 0-10V /4-20mA signal. 2. Use two 3/2 way valves to connect to port 1 of a 5/2 way valves. These two 3/2 way valves can be connected to different pressures to...
  10. srini1785

    Using a pneumatic cylinder or syringe to compress air and move a payload very fast

    The max speed of a Pneumatic cylinder of 40mm dia (1.5") is roughly 3m/sec. No way you are going to get a speed of 250m/sec using a pneumatic cylinder. Try firing a bullet type projectile.
  11. srini1785

    Cylinders in series to rotate a load

    Any application diagrams?. What is the load (in kgs) that you want to rotate and what is the approx Nm needed?. A Pneumatic cylinder with a rod eye in the piston and a rotary swivel joint to the rear end cover might just rotate a load.
  12. srini1785

    Solenoid valve symbology: detented coil on a two-position single-coil spring-return valve?

    Something to do with Manual Override?. Its a 3 position mid position closed valve. Hence the two dents. Pneumatic valves have them. I'm not sure about hydraulic ones.
  13. srini1785

    Small Hydraulic Proportional Valve

    This is what i could get from what i understand of the application. The pressure can be varied from 15 to 5000psi using a 0-10V or a 4-20mA signal. You write a code in the PLC for the scaling between the strain gauge input and the signal output to tune the PID...
  14. srini1785

    EX d Vs EX e

    Ex d (Flame proof) - Up to Zone 1 : Usually Die cast AL/Iron. Wiring rigged in such a way that the power trips if the lid is opened. Glands have to be Ex d rated too. Max wattage of each component has to taken into account before wiring. Extensively used in lighting. Ex e (Increased protection...
  15. srini1785

    intrinsic safety circuits

    IS circuit means that the Entity parameters (L/C) of the load (Transmitter) is lower than that of the barrier. So no chance of sparking due to hot working or Shorting. Technically, even the cable's entity parameter has to be considered for the length between the marshaling cabinet and the...
  16. srini1785

    Solenoid Valve Voltage Drop Issues

    Crazy thought: Can't you just not ground the negative of the power supply and the PLC output common and switch the valve?.
  17. srini1785

    Ask for a name of a pneumatic symbol

    From what i can see, its a pneumatic piston operated ON/OFF valve. The valve may be a ball / butterfly / knife gate etc.
  18. srini1785

    Pneumatic End of stroke / threshold sensor

    "The cylinder oscillates as you mentioned using some sore of a pilot switch, what I do not understand is how does the port I marked on the picture work, it is outside of the cylinder so how does the cylinder pressure or lack thereof get to that port? There's got to be internal pathway os some...
  19. srini1785

    Pneumatic End of stroke / threshold sensor

    What is the application?. Some sort of volumetric filling?. From the pics, i can only figure out that there are no solenoid or reed switches involved so its a pure pneumatic circuit. A threshold sensor is a pneumatic signal generator which sends out a pneumatic signal every time the cylinder...
  20. srini1785

    OMRON CP1EN40DT1-D PLC - PULS2 INSTRUCTION

    Hi, I am trying to control a Step Servo Motor (EX d) using an Omron CP1EN40DT1-D CPU. The task involves positioning control of a belt pulley system for positioning the carriage using a Step Servo motor. So its a position control application. I am trying to use the PULS2 instruction to limit the...

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