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Endress+Hauser nivocompact FTC 831, Installation And Operating Manual

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Endress+Hauser nivocompact FTC 831 Installation And Operating Manual Download Page 22

Safety Switching

By using the rotary switch, select the fail-safe mode for your particular
application:

•

Maximum fail-safe: The circuit is blocked if the probe is covered or the
power supply fails.

•

Minimum fail-safe: The circuit is blocked if the probe is covered or the
power supply fails.

Changing the fail-safe mode also changes the LED status indication.  

Fig. 16
Selecting the safety switching and function.

Nivocompact FTC 831

Calibration

20

Summary of Contents for nivocompact FTC 831

Page 1: ...nivocompact FTC 831 Level Limit Switch Installation and Operating Manual BA 024F 00 en 07 98 015191 0001 Hauser Endress The Power of Know How...

Page 2: ......

Page 3: ...ion 13 Wiring Connection 13 EC 40 Two Wire Connection for AC 14 EC 42 Three Wire PNP for DC 15 EC 43 Three Wire NPN for DC 16 EC 44 Relay output for DC and AC 17 Wiring On Site 18 Calibration 19 Switc...

Page 4: ...Nivocompact FTC 831 2...

Page 5: ...from above Application Examples Lime Kaolin Grain Spices Plaster Plastic Flour Semolina Cement granulates Fodder and similar bulk solids Note Bulk solids should have dielectric constants r 1 6 Please...

Page 6: ...IN ISO 228 I Process connection material glass fibre reinforced polyester PBTP Probe material reinforced steel wire mesh and electronics with PE coating Insulation from material fully insulated Probe...

Page 7: ...Fig 2 Dimensions Nivocompact FTC 831 Technical Data 5...

Page 8: ...ous max 350 mA Residual current with transistor blocked 100 A Protected against reverse polarity Power supply U 20 V 200 V or Power supply U 21 V 250 V 50 60 Hz Current consumption rms max 5 mA Peak i...

Page 9: ...is an electronic switch The entire measuring system consists of Nivocompact FTC 831 power supply and connected control systems switches signal transmitters e g process control systems PLC relays micro...

Page 10: ...hen the capacitance CA increases and with it the time constant This change in the time constant is evaluated and the Nivocompact FTC 831 is activated according to its switching mode Safety Switching T...

Page 11: ...om the probe end of an FTC 831 to the probe end of an FTC 731 must also be at least 500 mm The distance from the probe end of a Nivocompact FTC 831 to the silo wall or to any material build up must be...

Page 12: ...tensile forces present at this point may damage the probe or subject the silo roof to excessive strain e Too near the silo wall When swinging gently the probe can hit the wall or touch any build up w...

Page 13: ...rn the instrument by the 60 AF nut only If the instrument will not turn easily then slightly cut into the thread of the boss A torque of 80 Nm 100 Nm is normally sufficient to produce a reliable seal...

Page 14: ...n the electronic insert Remove the plug in electronic insert from the housing using the handle Slightly loosen the 3 screws in the housing see Fig 7 Rotating The housing can now be rotated through 360...

Page 15: ...hat the rating of the fine wire fuse corresponds to the maximum load to be connected The fine wire fuse does not protect the electronic insert of the Nivocompact FTC Diameter of Wiring Because of the...

Page 16: ...e drop across the connected load Load Cut off Note that loads connected in series are not completely disconnected from the power supply if the electronic switch in the electronic insert of the Nivocom...

Page 17: ...n normal switching mode The transistor is blocked on level alarm or with a power failure Protection Against Voltage Peaks Connecting to an instrument with a high inductance a voltage limiter should be...

Page 18: ...witching mode The transistor is blocked on level alarm or with a power failure Protection Against Voltage Peaks Connecting to an instrument with a high inductance a voltage limiter should be connected...

Page 19: ...n between Terminal 3 and Terminal 4 on level alarm or with a power failure Protection Against Voltage Peaks and Short Circuiting Protect the relay contact by connecting a spark barrier to instruments...

Page 20: ...10 mm A suitable gasket must also be used for other cable diameters You can seal with the water tight cable gland with cable having diameters from 5 mm to 12 mm Ensure that there is a good short groun...

Page 21: ...over the terminals with insulating tape before calibration Turn on the power supply Switching Delay Set the switching delay to between approx 0 5 s and 20 s Refer to Fig 15 The time interval is the s...

Page 22: ...e The circuit is blocked if the probe is covered or the power supply fails Minimum fail safe The circuit is blocked if the probe is covered or the power supply fails Changing the fail safe mode also c...

Page 23: ...ry set value may also be required if the minimum distances cannot be maintained For this calibration the silo must be empty or the level must be at least 100 mm below the probe The adjuster for calibr...

Page 24: ...required refer to Page 20 Fig 18 The capacitance calibration must be carried out both slowly and carefully Fig 19 Accurate adjustment ensures high switching reliability Material characteristics bulk...

Page 25: ...any material build up on the end of the probe With initial but permanently low material build up Carry out another capacitance calibration after the material build up if the Nivocompact does not swit...

Page 26: ...tant of the material too small Different material used than calibrated for Drier material used than calibrated for Cable damaged Fig 20 Troubleshooting with maximum fail safe mode Error with minimum f...

Page 27: ...he cable see Page 26 Carry out a new capacitance calibration with an empty silo Check operation Returning Parts for Repair If a Nivocompact FTC 831 cannot be repaired and needs to be sent back to Endr...

Page 28: ...he cable up from below The terminal clamps will come out at the top Shortening Push the cable upwards from below to the correct cable length Cut off the cable about 150 mm above the hexagonal nut univ...

Page 29: ...upper part of the Nivocompact FTC 831 Above right The cores shown being cut off and the plug connector pulled apart Below right Diagram to show how far the shortened cable projects out from the threa...

Page 30: ...g base for the electronic insert with mounting on the central threaded rod in the housing The plug base should lie approximately opposite the ground screw Put the plug connector and cores right at the...

Page 31: ......

Page 32: ...L Cochabamba Tel 042 56993 Fax 042 50981 Brazil Samson Endress Hauser Ltda Sao Paulo Tel 011 5363455 Fax 011 5363067 Canada Endress Hauser Ltd Burlington Ontario Tel 905 6819292 Fax 905 6819444 Chile...

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