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5

Troubleshooting

5.1

Maintenance and error messages

The level switch indicates error messages while in measurement mode and
during calibration routines.

Table 5-1: In Measurement Mode

Display

LED

Description

Possible causes and
solutions

UR

Flashing red

Under Range
Actual measured
capacitance is lower
than 3 pF.

Probe is defective or
the probe is
incorrectly wired.
The signal output
relay is de-energized.

OR

Flashing red

Over Range
After changing the
sensitivity from ≥ 2 pF
to ≤ 1 pF.

Actual calibrated
capacitance is higher
than 100 pF and
cannot be measured
with Sensitivity
setting ≤ 1 pF.
Change to Sensitivity
2 pF (if DK of the
material is high
enough) or
recalibrate.

ERR

Constant red

Auto or Manual
Function Test error

Electronics fault.
Replace the
electronics.
The output signal
relay is de-energized.

October 2020

Quick Start Guide

Quick Start Guide

39

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Содержание Rosemount 2555

Страница 1: ...Quick Start Guide 00825 0100 2555 Rev AC October 2020 Rosemount 2555 Solids Level Switches Capacitance Probe ...

Страница 2: ...Contents Introduction 3 Mechanical installation 9 Electrical installation 14 Configuration 20 Troubleshooting 39 Maintenance 44 Quick Start Guide October 2020 2 Quick Start Guide ...

Страница 3: ...oting and order related questions United States 1 800 999 9307 7 00 am to 7 00 pm CST Asia Pacific 65 777 8211 North American Response Center Equipment service needs 1 800 654 7768 24 hours a day includes Canada Outside of these areas contact your local Emerson representative WARNING Physical access Unauthorized personnel may potentially cause significant damage to and or misconfiguration of end u...

Страница 4: ... level switch Ensure the wiring is suitable for the electrical current and the insulation is suitable for the voltage temperature and environment Process leaks could result in death or serious injury Ensure the level switch is handled carefully If the process seal is damaged gas or dust might escape from the silo or other vessel Any substitution of non recognized parts may jeopardize safety Repair...

Страница 5: ... included with the returned level switch 1 2 Applications A Rosemount 2555 Solids Level Switch is used for monitoring the level of bulk materials in all types of containers and silos The level switch can be used with all powdery and granulated bulk materials slurry and liquids Four different housing options are available Standard local for installations in non hazardous area ordinary locations for...

Страница 6: ...has an extended length mount it vertically on top of a silo to monitor the maximum filling limit The length of the capacitance probe can be up to 98 4 in 2 5 m with a rod extension tube or up to 787 in 20 m with an extension rope The use of a sliding sleeve is recommended so that the switching point can be changed easily during the live operation of the level switch Note The Rosemount 2555 Product...

Страница 7: ...and sliding sleeve for adjustable height I Rope version full silo detection J Rope version empty silo detection K Optional sliding sleeve Active and inactive probe lengths The active length is always inside the silo and generates an electrical field between the probe and the silo wall With active shield technology the RF measurements are unaffected by product build up on the probe The inactive len...

Страница 8: ...rom the probe level it causes a decrease in capacitance that is detected by the electronics and the output switches to indicate an uncovered state When the solids medium in the vessel silo rises and covers the rod it causes an increase of capacitance that is detected by the electronics and the output switches to indicate a covered state The electrical output will vary depending on the electronics ...

Страница 9: ...able precautions Regular checks as part of routine inspections or establishing from a material s data sheet that it is resistant to specific chemicals 3 It is the responsibility of the installer to a Take protective measures such as fitting an angled shield reverse V shape to the silo or selecting an extension tube option when there are high mechanical forces b Ensure that the process connection i...

Страница 10: ...torque of 80 Nm 2 1 4 Sliding sleeve Tighten both M8 screws with a torque of 20 Nm to establish a seal and maintain the process pressure 2 1 5 Mechanical load The load at points A and B Figure 2 1 must not be exceeded All ratings are for 104 F 40 C Figure 2 1 Maximum Mechanical Loads A B Table 2 1 Maximum Mechanical Loads Rosemount 2555S Rosemount 2555R Rod version Rope version A 125 Nm 4 kN tensi...

Страница 11: ...s will help prevent difficulties when the cover needs to be removed during future maintenance tasks 2 1 8 Minimum distances Figure 2 2 shows the minimum distances required between installed level switches the walls of a silo and a protective shield The installation of a protective angled shield above the level switch is recommended depending on the type of bulk solids Figure 2 2 Minimum Distances ...

Страница 12: ... Correct installation The inactive length is correctly used with a long socket D Correct installation The inactive length is correctly used even though there is a build up of solids material E Incorrect installation The active probe is inside the socket F Incorrect installation The active probe is covered by a build up of material and is not detecting the true level G Incorrect installation The ac...

Страница 13: ...et height is short C Correct installation The inactive length is correctly used within a long socket D Incorrect installation The active probe is inside the socket E Incorrect installation The active probe is covered by a build up of material and may not be detecting the true level October 2020 Quick Start Guide Quick Start Guide 13 ...

Страница 14: ...regulations or VDE 0100 Regulations of German Electrotechnical Engineers must be observed When using 24 V supply voltage an approved power supply with reinforced insulation to mains is required 3 1 4 Fuse Use a fuse as stated in the connection diagrams For details see Wiring the level switch 3 1 5 Residual Current Circuit Breaker RCCB protection In case of a defect the distribution voltage must au...

Страница 15: ...pped to show no more than 0 31 in 8 mm of the copper strands For Type DE housings remove insulation of no more than 0 35 in 9 mm Always check that the power supply is disconnected or switched off to avoid coming into contact with dangerous live parts 3 1 8 Cable glands The screwed cable gland and stopping plug must have the following specifications Ingress protection IP67 Temperature range from 40...

Страница 16: ...ountry must be observed The flameproof seals and stopping blanking plugs must have an adequate type approval and a temperature range of at least 40 to 176 F 40 to 80 C In addition they must be suitable for the conditions and correctly installed Where available the original provided parts of the manufacturer must be used Installation with a conduit system in a hazardous area In a conduit system sin...

Страница 17: ... to avoid a static electrical build up This is particularly important for applications with pneumatic conveying and non metallic containers 3 1 13 Opening the lid Before opening the lid ensure no dust deposits no airborne dusts and no hazardous atmosphere are present Do not remove the lid cover in hazardous areas while circuits are alive 3 2 Wiring the level switch Figure 3 1 Connections Overview ...

Страница 18: ...tective Earth PE terminal Figure 3 3 Connections Overview for Type DE Housing A B C A Connection terminals in a terminal box for increased safety The fixing torque is 0 5 to 0 6 Nm B Internal Protective Earth PE terminal C External Protective Earth PE terminal Quick Start Guide October 2020 18 Quick Start Guide ...

Страница 19: ...mum 10 A 250 V HBC fast or slow Signal output floating relay DPDT Maximum 250 Vac 8 A non inductive Maximum 30 Vdc 5 A non inductive Fuse on signal output maximum 10 A 250 V HBC fast or slow Figure 3 4 Power Supply and Signal Output 1 1 2 3 4 5 6 7 8 PE L N A B A Power supply B Signal output October 2020 Quick Start Guide Quick Start Guide 19 ...

Страница 20: ... calibration Calibration automatically starts when the Rosemount 2555 is powered up for the first time If the level switch is powered off and then on again this calibration procedure is not repeated when starting up Prerequisites The level switch must be correctly mounted and wired The level of the solids material must be below the probe Procedure 1 Ensure the level of the solids material is not c...

Страница 21: ...tatus of the signal output Display 1 LED Description u c Green or yellow 2 Actual measured capacitance in pF 3 Actual signal output states uncovered probe u or covered probe c 1 If unexpected messages are displayed see Maintenance and error messages 2 Green or yellow depending on setting of FSH and FSL 3 Resolution is 0 1 pF 100 pF or 0 5 pF 100 pF If values are 100 pF a dot behind the number mean...

Страница 22: ...conds to enter the quick start menu While in the quick start menu press and hold the Menu button for 3 seconds to return to Measurement mode Press the Menu button for less than 1 second to store a new setting and proceed to the next menu item CAL TEST Use the arrowed buttons CAL and TEST to increase and decrease the value of a setting Table 4 3 Quick start Menus Display Description Menu item A FSH...

Страница 23: ...setting is 2 pF Optional standard settings if ordered 4 4 1 FSH and FSL settings FSH Use the FSH setting for full silo detection applications Power failure or line break is considered by the electronics to be as full signal as protection against overfilling FSL Use the FSL setting for empty silo detection applications Power failure or line break is considered by the electronics to be as empty sign...

Страница 24: ...acitance and excessive build up the sensitivity can be reduced 4 pF or more For the calibration procedure see Powering up the first time calibration Calibration with uncovered and covered probe Sets the switching point in the middle between uncovered and covered probe capacitances It ensures the maximum switching distance to both uncovered and covered probe capacitance and helps to prevent materia...

Страница 25: ...e solids material is not covering the probe 3 Set the sensitivity This is only required in certain circumstances See Guide to push button calibration Use the quick start menu item D to set the sensitivity See Quick start menus 4 Press and hold the CAL button for three seconds CAL The LED is red and flashing when the calibration is started a Wait approximately 10 seconds until the calibration is co...

Страница 26: ... Menu button 2 Press and hold the CAL button again for three seconds to restart the calibration If any other messages are displayed see Maintenance and error messages Postrequisites The Rosemount 2555 is now calibrated and ready to be configured Quick Start Guide October 2020 26 Quick Start Guide ...

Страница 27: ...obe 3 Press and hold the CAL button for three seconds CAL The LED is red and flashing when the calibration is started a Wait approximately 10 seconds until the calibration is completed b The display then indicates the actual measured capacitance and a u for the uncovered probe state 4 Make a note of the actual measured capacitance displayed when the probe is uncovered 5 Make a note of the actual m...

Страница 28: ... to 35 pF 25 pF 53 pF 35 pF 35 pF 35 pF 1 Capacitance difference between uncovered and covered probe 2 The difference between uncovered and covered should be well above the sensitivity setting i e approximately 50 percent 3 The difference between uncovered and covered does not need to be above the sensitivity setting since with the capacitance will increase with rising solids material If different...

Страница 29: ...arts again when the level switch is powered up Note Only the calibration is affected The settings in the menus are not changed 4 7 Data storage of the last valid calibration values If the power supply is switched off the last valid calibration values are stored and are still valid when power is switched on again 4 8 Manual function test proof test The Rosemount 2555 can self test the internal elec...

Страница 30: ... press and hold the MENU button for 10 seconds to enter the Advanced menu Keep holding the MENU button even when the Quick start menu item A FSx appears after 3 seconds If Code is displayed a Lock Code is required Set the code number with the arrow buttons CAL and TEST and confirm with the MENU button Then press and hold the MENU button again for 10 seconds to enter the Advanced menu While in the ...

Страница 31: ...item D for more than two minutes Do not set to ON if excessive solids material build up is present since this build up may decrease the measured capacitance and cause an incorrect calibration 1 Menu item F is not valid and will not appear on the display if manual calibration Menu item G is set to ON 2 Factory default setting 4 9 2 Manual calibration Note The LED will be red and flashing while the ...

Страница 32: ...to covered switching point E Capacitance of covered probe Factory setting for the lowest pF value is 3 pF Resolution is 0 1 pF 100 pF or 0 5 pF 100 pF If values are 100 pF a dot behind the number means 0 5 pF e g 100 means 100 5 pF L pF Hysteresis Hysteresis can be adjusted to minimize constant switching of the signal output This can happen when there are unstable capacitance measurements due to m...

Страница 33: ...d and starts flashing The status output relay is de energized N pF Auto calibrated switch point covered to uncovered If OR or UR is displayed there is no valid calibration See Troubleshooting P pF Auto calibrated switching point uncovered to covered If OR or UR is displayed there is no valid calibration See Troubleshooting Q C Minimum Stored Electronics Temperature R C Maximum Stored Electronics T...

Страница 34: ...ration is recommended for special purposes Calibration with uncovered probe only This is the simplest method and therefore is recommended It is applicable for higher DK values which give a higher change of capacitance between an uncovered and covered probe The DK value of the solids material is required to be known to set the sensitivity range and an increase to the switching point For the calibra...

Страница 35: ...Low Recommended 10 pF Possible 10 Low Recommended 15 pF Possible 4 10 1 Manual calibration for an uncovered probe Prerequisites The level switch must be correctly mounted and wired The level of the solids material must be below the probe The signal output delay should be set to 0 5 seconds Procedure 1 Review the stages in the calibration procedure A C E F B D A Capacitance of uncovered probe B Inc...

Страница 36: ...o uncovered state If the output has once changed to uncovered and changes back to covered the value must be decreased by setting the Hysteresis menu item L 5 Set a switch point for the covered to uncovered change Use the Advanced menu item K to set the switch point to the established capacitance of an uncovered probe an increase to the switch point See Advanced menu 6 Set the Hysteresis Use the Ad...

Страница 37: ...for uncovered to covered probe E Capacitance of covered probe 2 Set the sensitivity Check for the required sensitivity range low or high depending on the material to be measured Use the calibration guide See Guide to manual calibration Use the Advanced menu item H to set the sensitivity See Advanced menu 3 Make a note of the actual measured capacitance displayed when the probe is uncovered 4 Make ...

Страница 38: ...ty range Advanced menu item H If the difference between uncovered and covered probe is smaller than 1 pF use a more sensitive probe longer active probe For rope version call factory 6 Set the Hysteresis Use the Advanced menu item L to set the hysteresis The factory setting is normally sufficient and does not need to be changed Need help If the actual measured capacitance is close to the limits of ...

Страница 39: ...ective or the probe is incorrectly wired The signal output relay is de energized OR Flashing red Over Range After changing the sensitivity from 2 pF to 1 pF Actual calibrated capacitance is higher than 100 pF and cannot be measured with Sensitivity setting 1 pF Change to Sensitivity 2 pF if DK of the material is high enough or recalibrate ERR Constant red Auto or Manual Function Test error Electro...

Страница 40: ...g 2 pF or 100 pF sensitivity setting 1 pF Calibration is not possible A long rope version in an empty silo may exceed 100 pF capacitance Change Sensitivity setting to 2 pF if DK of the material is high enough Probe may be covered with material Ensure that the probe is uncovered The probe may be faulty or incorrectly wired G ON Flashing red CAL button pressed with Manual calibration set to ON Start...

Страница 41: ...K of the material is high enough Probe may be covered with material Ensure that probe is uncovered The probe may be faulty or incorrectly wired 400 2 Yellow or green With the sensitivity range set to low Actual measured capacitance is close to or higher than 400 pF depending on capability of electronics Calibration is not possible Probe may be covered with material Ensure that the probe is uncover...

Страница 42: ...ect probe wiring Check the probe wiring see below Signal output state is uncovered probe even though the solids material is above the probe The actual measured capacitance 3 is less than the calibrated switching point 4 for an covered to uncovered probe change of state Calibration was done with covered probe Recalibrate 3 Calibration was performed with a sensitivity that was too low Recalibrate wi...

Страница 43: ...s with a multimeter A B C D E A Orange probe and yellow shield B Green yellow ground C Ground D Shield E Probe Less than 5 Ohm must be present between Orange wire and probe Yellow wire and shield Green yellow wire and ground More than 1 MΩ resistance must be present between Orange and yellow wires Orange and green yellow wires If other values are present the wiring of the probe is incorrect or def...

Страница 44: ...bserved Cleaning agent must comply with the materials of the unit chemical resistance Mainly the shaft sealing lid sealing cable gland and the surface of the unit must be considered The cleaning process must be done in a way that The cleaning agent cannot enter into the unit through the shaft sealing lid sealing or cable gland No mechanical damage of the shaft sealing lid sealing cable gland or ot...

Страница 45: ...6 5 Production date The production year is shown on the nameplate 6 6 Spare parts Refer to the Rosemount 2555 Product Data Sheet for all spare parts October 2020 Quick Start Guide Quick Start Guide 45 ...

Страница 46: ...Quick Start Guide October 2020 46 Quick Start Guide ...

Страница 47: ...October 2020 Quick Start Guide Quick Start Guide 47 ...

Страница 48: ... 6340 Baar Switzerland 41 0 41 768 6111 41 0 41 768 6300 RFQ RMD RCC Emerson com Asia Pacific Regional Office Emerson Automation Solutions 1 Pandan Crescent Singapore 128461 65 6777 8211 65 6777 0947 Enquiries AP Emerson com Middle East and Africa Regional Office Emerson Automation Solutions Emerson FZE P O Box 17033 Jebel Ali Free Zone South 2 Dubai United Arab Emirates 971 4 8118100 971 4 886546...

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