5550 & 5550G MECHANICAL VIBRATION SWITCHES User Guide
Contents
1. N8 OUO 1300 MODEL a680 aN o HOLIMS NOLLVHHIA 9B 3 00 horizontal orientation 9D 9 00 horizontal orientation preferred Figure 9 Horizontal orientations of 5550 9D position is strongly recommended conduit hole facing down to allow drainage of any accumulated condensation 2 8 Affixing The Switch To The Machine Mount the switch securely to the machine using the 4 hole pattern 5550 or 2 hole pattern 5550G on the baseplate It is extremely important that the device be rigidly attached to the machine so that it reflects machinery vibration not vibration incurred by a loose mounting an insufficiently stiff mounting bracket or a bracket resonance Also the switch should be mounted in a location where its own mass does not appreciably affect the natural frequency ies of the member to which it is attached When attaching to a support beam skid or other member thought should be given to the usefulness of the measurement and what level of machinery damage must be present before sufficient acceleration will occur at the measurement location For additional application assistance consult the factory or your nearest Metrix representative 2 9 Wiring The switch provides a single SPDT relay or optional double SPDT relays allowing use as a DPDT device When a reset startup delay coil is specified optional on 5550 standard on 5550G suitable wiring terminals are also available Refer to Fig2. Figure 7 shows the same horizontal machine as in Figures 5 and 6 but with the switch ori ented vertically As noted in Section 2 4 a vertical orientation of the switch is discouraged because machines will generally experience less vibration in the vertical direction than in the horizontal direction and the switch will be less effective Metrix does not recommend installation as shown in Figure 7 unless the machine truly experiences more vibration in the vertical direction than in the horizontal direction or the 2g 24V reset coil option is being used see note in Section 2 4 METRIX Doc 1231558 REV B Oct 2014 Page 6 of 20 Emm N Shaft Radial Y Axis 5550 MOUNTING LOCATION SHAFT CENTERLINE Shaft Radial X Axis SHAFT Z AXIS AXIAL SHAFT CENTERLINE CONDUIT BASEPLATE SIDE VIEW END VIEW Figure 7 Horizontal machine showing vertictal 5550 mounting orientation not recommended 2 6 Vertical Machines Figure 8 shows the preferred installation for a vertical machine The switch is mounted horizontally and with its sensitive axis pointing directly at the shaft In contrast Figure 7 shows the switch mounted vertically which is not recommended Because most vertical machines like horizontal machines are rigidly fixed by a baseplate or other mounting that constrains them from vibrating in the vertical direction aligning the switch s sensitive axis in the vertical direction aligns it in the direction of least vib
3. 2 5 Horizontal Machines Although Figures 5 and 6 both show horizontal switch orientations they are not equivalent In Figure 5 the sensitive axis of the switch points directly at the machine s shaft in Figure 6 it does not and instead is aimed at point P somewhere above the shaft Either mounting orientation can be effective but 5 is preferred METRIX Doc 1231558 REV B Oct 2014 Page 5 of 20 N TES Shaft Radial Y Axis 5550 MOUNTING LOCATION NOTE A Hate hole WITH CONDUIT FITTING A drain hole at low point is recommended to allow accumulated FACING DOWN moisture to exit except in g explosion proof installations SHAFT CENTERLINE Shaft Radial X Axis SHAFT Z AXIS SHAFT CENTERLINE CONDUIT SIDE VIEW END VIEW Figure 5 Horizontal machine showing horizontal 5550 mounting orientation and preferred location Conduit fitting faces down to allow drainage of any condensation Shaft Radial Y Axis 5550 MOUNTING LOCATION Sore eat leri A WITH CONDUIT FITTING A drain hole at low point is recommended to allow accumulated FACING DOWN moisture to exit except in explosion proof installations SHAFT CENTERLINE Shaft Radial X Axis SHAFT Z AXIS AXIAL SHAFT CENTERLINE CONDUIT COND BASEPLATE SIDE VIEW END VIEW Figure 6 Horizontal machine showing horizontal 5550 mounting orientation and alternate location Conduit fitting faces down to allow drainage of any condensation
4. gaskets are used at each of these entry points and silicone dielectric grease is applied at the factory However in extremely moist environments an additional liberal coating of silicone dielectric grease should be applied in the field at time of installation This practice will provide added protection against moisture ingression over time Metrix recommends Dow Corning 33 Molykote Extreme Low Temperature Silicone Grease or equivalent 2 12 Outline Diagrams and Physical Dimensions Refer to the Metrix product datasheet 1004461 available at www metrixvibration com 3 IMPORTANT SAFETY INFORMATION 3 1 General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it e USE ONLY AS SPECIFIED To avoid potential hazards use this product only as specified Only qualified personnel should perform installation and removal procedures e CONNECT AND DISCONNECT PROPERLY Do not connect or disconnect this product while it is connected to a live power source e GROUND THE PRODUCT The housing of this product should be connected to earth ground Before energizing the product ensure its housing is properly grounded e OBSERVE ALL TERMINAL RATINGS To avoid fire or shock hazard observe all ratings and markings on the product Consult the individual sections of this manual for further information before making connections to the product e DO NOT OPERATE WITHOUT COV
5. mount the switch so that the conduit outlet faces down 2 10 3 Units with NPT conduit holes ordering option E 1 2 3 7 have 4 NPT threads Units with metric conduit holes ordering option E24 6 and 8 have M20 x 1 5 threads Refer to Metrix datasheet 1004461 for a complete list of ordering options 2 10 4 Use proper conduit seals and hole plugs meeting the environmental requirements of the installation to prevent ingress of moisture and dust conduit hole provide only physical thread protection dur ing shipping and handling They are not designed for use as permanent hole plugs and do not provide adequate environ mental protection for the switch when installed in the field 9 NOTE The disposable plastic plugs caps that ship in each 2 11 Protecting Against Moisture Ingression All installations should observe the guidelines of 2 10 These are particularly important when the switch will be mounted in moist environments such as on cooling tower struc tures evaporative fans marine applications or other installations where the switch will be exposed to rain elevated humidity hose directed water or any environmental conditions that might allow condensation to form at or in the switch associated wiring and conduit 2 11 1 Ensure the cover is properly tightened The importance or properly tightening cover bolts 5550 or screw type lid 5550G per tains not just to sealing against ignition of a flammable atmosphere outside t
6. render machinery protection ineffective DO NOT at this time attempt to adjust the setpoint for high vibration encountered during machine startup This will be addressed in step 4 2 11 METRIX Doc 1231558 e REV B Oct 2014 Page 14 of 20 N d NOTE If more than one full turn of the setpoint screw is re quired to accommodate variations in normal running conditions without false trips the 5550 may not be an appropriate device for your application Contact the factory for assistance 4 2 10 You have now established your unique setpoint and no further adjustment is required If the switch was supplied with an optional reset startup delay coil connect all field wiring and proceed to section 5 If the switch was not supplied with this coil proceed to step 4 2 11 to determine whether a startup delay is needed for your application 4 2 11 Stop the machine press the reset plunger pushbutton to ensure the switch is in its untripped state and then restart the machine If the switch does not trip during machine startup you do not require a startup delay Connect all field wiring and place the switch into service If it does trip due to elevated vibration levels during startup you will require an appropriate startup delay coil see section 5 Consult the factory or your nearest Metrix representative for assistance to normal machinery operation not startup vibration levels DO NOT adjust the setpoint screw to increase the switch s t
7. ER The cover serves multiple purposes that may include protection against moisture and dust ingression protection of personnel from electrical shock and protection against METRIX Se eae pt ne ee Doc 1231558 e REV B Oct 2014 Page 11 of 20 l Pag ignition of flammable atmospheres when used in locations with hazardous area ratings Do not use the device without its cover except when making adjustments or connections as noted in this manual e AVOID EXPOSURE TO CIRCUITRY Do not touch exposed electrical connections and components when power is present e DO NOT OPERATE WITH SUSPECT FAILURES If you suspect there is damage to this product have it inspected by qualified personnel 3 2 Safety Terms and Symbols Terms that appear in this manual requiring special attention include e WARNING Warning statements identify conditions or practices that could result in injury or loss of life e CAUTION Caution statements identify conditions or practices that could result in damage to the product loss or corruption of data or damage to the environment or other property e NOTE Notes identify material of special interest or importance to the user not includ ing cautions or warnings Symbols that may appear on the product and or in this manual include e HIGH VOLTAGE PRESENT e PROTECTIVE EARTH DANGER or CAUTION e FUNCTIONAL GROUND e NOTE 4 SETPOINT ADJUSTMENT Metrix mechanical vibration switches are shipped from the
8. METRIX ee 5550 amp 5550G MECHANICAL VIBRATION SWITCHES User Guide Installation Manual The 5550 and 5550G mechanical vibration switches provide vibration protection for low to medium speed machinery An inertia sensitive mechanism activates a snap action switch with SPDT output contacts if the vi bration exceeds an adjustable setpoint The 5550 mechanical vibration switch contacts can be used to activate an alarm or initiate equipment shutdown The housing is weath erproof with an optional hazardous area MODEL 5550 rating Electrical remote reset with start up time delay and a second set of SPDT output contacts to accommodate DPDT needs C c Uus e g separate trip and trip light circuits are 1180 LISTED available The 5550G uses identical internal mecha LE nisms but carries an IECEX rating ideal for IIC gas group applications NOTE The 5550 5550G MODEL 5550G switches must be stored in a dry area when not installed The C included cap plug protects the conduit hole thread from dam 1180 ages during shipping handling and potential debris dust from entering the housing DOC 1231558 REV B Oct 2014 1 PRINCIPLES OF OPERATION 1 1 Overview Model 5550 and 5550G Mechanical Vibration Switches offer basic protection against gross changes in structural seismic acceleration The two units are identical internally and differ only in their enclosure style and external access
9. TIGHTLY CLOSED WHEN IN OPERATION CABLE TEMPERATURE RISE 15K USE SUITABLE CABLE ATTENTION AFIN DE PREVENTIR L INFLAMMATION D ATMOSPHERES DANGEREUSES COUPER L ALIMENTATION ELEC TRIQUE CIRCUIT AVANT D OUVRIR COFFRET GARDER LE COUVERCLE BIEN FERMETANT QUE LES CIRCUITS SONT SOUS TENSION TEM PERATURE DE CABLE MONTE 15K UTILISEZ CABLE APPROPRIE Doct 1231558 REV B Oct 2014 Page 19 of 20 IECEx Approval IEC Markings IEC Standards CAUTION TO REDUCE RISK World Ex d IIC T6 Gb IEC60079 0 2011 OF IGNITION OF HAZARDOUS Ex tb IIIC T85 C Db Ta IEC600079 1 2007 ATMOSPHERES DISCONNECT THE 40 C to 70 C IP66 IEC600079 31 2008 SUPPLY CIRCUIT BEFORE OPENING IECEx BAS10 0095X KEEP ASSEMBLY TIGHTLY CLOSED WHEN IN OPERATION CABLE TEMPERATURE RISE 15K USE ATEX Approval ATEX Markings EN Standards SUITABLE CABLE Europe EN60079 0 2012 x 11 2GD Ex d IIC T6 Gb EN60079 1 2007 ATTENTION AFIN DE PRE VENTIR L INFLAMMATION Ex tb IIIC T85 C Db T EN60079 31 2009 s a D ATMOSPHERES DANGEREUSES 4 eae are COUPER LALIMENTATION ELEC TRIQUE CIRCUIT AVANT D OUVRIR COFFRET GARDER LE COUVERCLE BIEN FERMETANT QUE LES CIRCUITS SONT SOUS TENSION TEMPERATURE DE CABLE MONTE 15K UTILISEZ CABLE APPROPRIE C Baseefa 10ATEX0177 ENVIRONMENTAL INFORMATION This electronic equipment was manufactured according to high quality stan dards to ensure safe and reliable operation when used as intended Du
10. acceleration smaller than 1G must be reliably detected Instead Metrix offers more sophisticated electronic vibration sensing solu tions that are better suited for such applications 1 3 Primary Variables Affecting 5550 Operation The required seismic acceleration to move the 5550 or 5550G mechanical switch from its un tripped position to its tripped position is a function of three variables as detailed in sections 1 3 1 through 1 3 4 1 3 1 Variable 41 Spring Force Direction The movable trip plate mass inside the switch housing is SETPOINT RESET PLUNGER free to move on an essentially frictionless pivot and is ADJUST restrained in its untripped position by a spring By turning the setpoint adjustment screw Figure 3 changes are made to the spring s direction and to a much lesser extent its tension Thus the spring mechanism exerts an essentially constant force on the trip plate and turning the setpoint ad justment screw changes the direction of this force Turning the setpoint screw clockwise CW aligns the spring force more fully in the untripped direction below the pivot see Figure 1 making it more difficult to trip the device Turn ing the setpoint screw counter clockwise CCW does the opposite making it easier to trip the device FIGURE 3 MODEL 5550 setpoint adjustment and manual reset NOTES 1 Turning the screw too far in the counter clockwise CCW direction will eventu ally pull the spring past t
11. atmospheres refer to Metrix manuals M8905 5550 and 100356 5550G for important safety information All of these manuals as well as additional technical resources are available on our website at www metrixvibra tion com You may also contact Metrix or its local representative for additional assistance using the information on the last page of this manual METRIX Doc 1231558 e REV B Oct 2014 Page 4 of 20 Emm N 2 1 Maintenance Convenience Versus Measurement Quality While it is desirable to mount the switch in a location in which it can be easily serviced and maintained this should not be the dominant consideration The switch serves as a me chanical sensor and for it to provide suitable machinery protection it must be mounted ina location and orientation where the machine s inertial forces during malfunction conditions will be suitably large to trip the switch Thus locating the switch for optimal mechanical sensing rather than optimal serviceability must always remain the primary consideration However in most circumstances judicious choice of mounting location and switch orienta tion can accommodate both requirements satisfactorily 2 2 Sensitive Axis The switch is designed to respond to inertial forces only in the direction of its sensitive axis Figure 4 When care is not taken to mount the switch properly relatively large inertial forces can occur elsewhere on the machine that will not be transmitted properly to t
12. e to its nature this equipment may contain small quantities of substances known to be hazardous to the environment or to human health if released into the environ ment For this reason Waste Electrical and Electronic Equipment commonly known as WEEE should never be disposed of in the public waste stream The Crossed Out Waste Bin label affixed to this product is a reminder to dispose of this product in accordance with local WEEE regulations If you have questions about the disposal pro cess please contact Metrix Customer Service info metrixvibration com www metrixvibration com 8824 Fallbrook Dr Houston TX 77064 USA Tel 1 281 940 1802 e Fax 1 713 559 9421 After Hours CST Technical Assistance 1 713 452 9703 METRIX Doc 1231558 e REV B Oct 2014 Page 20 of 20 N
13. ed off before opening the enclosure in an explosive atmosphere 2 9 5 The switch must be electrically connected by means of a flameproof dust cable gland or stopping box certified to IEC60079 0 2011 EN60079 0 2012 IEC60079 1 2007 EN60079 1 2007 and IEC600079 31 2008 EN60079 31 2009 2 9 6 For ambient temperatures below 10 C use field wiring suitable for the minimum ambient temperature 2 9 7 Reinstall the cover by first ensuring the o ring is in place and properly seated in the housing s groove Place the cover on the unit and screw tight model 5550G or by torqueing the four cover bolts shown in Figure 11 model 5550 only to 6 7 ft lbs Figure 11 5550 cover bolt locations METRIX Doc 1231558 REV B Oct 2014 Page 9 of 20 N Pag d NOTE Do not over torque the cover bolts on the model 5550 switch This could damage the housing and compromise the seal 2 10 Conduit When attaching conduit observe the following 2 10 1 Avoid long runs of unsupported conduit that can transfer unwanted impacts or vibration of the conduit rather than of the machine 2 10 2 Always slope conduit away from the switch and generally orient such that accumu lated moisture or condensation does not drain into the switch For non explosion proof installations consider the use of an adequate number of J traps or other drain mecha nisms at low points to preclude moisture from collecting in the switch or in the conduit When possible
14. elay to hold the switch in an Figure 1B 5550 mechanical switch trip untripped state for as long as coil excitation is sup mechanism in tripped position Micro plied up to 30 seconds the maximum duration switch red is actuated is governed by a non adjustable factory installed thermistor circuit The startup delay feature is useful during machinery startup when vibra tion in excess of the normal trip setting may be temporarily incurred 1 2 Typical Application The model 5550 and 5550G mechanical vibration switches are typically used on cooling tower fans and mounted such that loss of a blade will result in significant structural accelera tion at the switch mounting location Figure 2 The switch may be used on other types of machin ery as well but care must be taken to ensure that adequate change in acceleration between normal and malfunction conditions will exist at the switch s mounting location The switch is not designed to reli ably trip for acceleration levels below approximately 1 g 9 8 m s or when less than 1 g exists between a machine s normal running vibration levels and mal function vibration levels Figure 2 Typical 5550 installation on cooling tower fan support strut METRIX Doc 1231558 e REV B Oct 2014 Page 2 of 20 8 NOTE Metrix Mechanical Vibration Switches are not intended for use on high speed tur bomachinery or on machines where changes in seismic
15. factory such that when slowly rotated 180 degrees from an upright position cover facing up to an upside down position cover facing down the trip plate will snap from its untripped position to its tripped posi tion 4 1 Verification of Factory Setpoint To verify the factory setpoint place the switch on a flat surface with the cover facing up Do not connect any wiring yet Press the reset plunger model 5550 only remove cover on model 5550G to ensure the switch is in its untripped position it may have tripped due to shock or vibration incurred during shipping and handling Then slowly lift the switch METRIX Doc 1231558 e REV B Oct 2014 Page 12 of 20 N CAUTION The default setpoint as shipped from the factory is not intended to be suitable for any particular machinery appli cation Each application requires that the setpoint be careful ly field adjusted for the specifics of your machine as outlined in Section 4 2 below Failure to adjust the setpoint in this manner constitutes a misuse of the product and may lead to ineffective machinery protection resulting in extensive machinery damage and personnel injury up and rotate it to an upside down position as shown in Figure 12 As the switch reaches the 180 degree position you should hear an audible click indicating it has snapped to its tripped state If the device does not trip turn the setpoint adjustment screw approximately 1 16th turn CCW and repeat the abo
16. h facing up will require the most excitation to trip a switch facing horizontally will require 1g less excitation to trip and a switch facing down will require 2g less excitation to trip GRAVITY q GRAVITY q gt gt lt L aa Iv SENSITIVE LLI EY Nn X z lt LLI n SENSITIVE AXIS 4A Horizontal orientation 4B Vertical orientation 4C Vertical orientation cover facing right cover facing up cover facing down FIGURE 4 Side views showing horizontal and vertical orientations of 5550 switch NOTE Depending on how the setpoint is adjusted sim ply turning the switch on its side or upside down may be sufficient to cause it to trip due to the effects of gravity 1 3 3 Variable 3 Vibration Forces Acting on the Switch By shaking or impacting the switch along its sensitive axis with sufficient inertial force for a sufficient duration and within its frequency response range the trip plate mechanism will overcome the combined forces of gravity depending on orientation and spring ten sion snapping from untripped to tripped position 2 INSTALLATION and thoroughly understand these instructions They are intended for experi enced personnel who require only basic installation guidance and assume that the switch has already been selected and applied properly for the machinery at hand WARNING Before proceeding to install model 5550 and 5550G switches read When installing the switches in hazardous
17. he switch and or will occur in a direction perpendicular to the switch s sensitive axis Both of these conditions can render the switch s ability to trip less effective or even ineffective 2 3 Horizontal Orientation A horizontal orientation of the switch means that it is mounted with its sensitive axis per pendicular to the direction of gravity refer to Figure 4A In this orientation the effects of gravity on the switch s trip mechanism are negligible and the trip point is governed almost entirely by the spring It is recommended that the switch be oriented horizontally because most machines are less constrained less stiff in the horizontal direction than in the vertical direction and will therefore vibrate more in the horizontal direction 2 4 Vertical Orientation A vertical orientation of the switch means that it is mounted with its sensitive axis parallel to the direction of gravity It is not recommended that the switch be oriented vertically except as noted above because most machines are more constrained more stiff in the vertical di rection than in the horizontal direction and will therefore vibrate less in the vertical direction NOTE When specifying units with 2g reset coil holding strength simultaneously with a 24 VDC reset coil do not install the switch with a horizontal orientation or upside down The reset coil lacks sufficient holding force for anything other than a vertical face up orientation Figure 4B
18. he over center location and cause the switch to snap into the tripped position without any external inertial excitation When adjusted in this manner the switch cannot be reset from its tripped position Also the nature of this over center mechanism can cause it to be very unstable when adjusted too close to its equilibrium location resulting in false trips 2 The setpoint adjustment screw on the model 5550G switch is not externally accessible The cover must be removed Do not remove the cover while energized circuits are pres ent in hazardous areas 1 3 2 Variable 2 Switch Orientation Depending on how the switch is oriented gravity will act on the trip mechanism s mov able mass to either add to or subtract from the spring force For both model 5550 and 5550G switches the switch orientation is the direction in which the cover faces With the switch oriented horizontally Figure 4A the effects of gravity will be negligible and only METRIX Doc 1231558 REV B Oct 2014 Page 3 of 20 N pee the spring force will govern the trip plate s behavior With the switch oriented vertically up Figure 4B gravity acts to keep the trip plate s movable mass in the untripped position and inertial excitation must counteract both gravity and the spring force With the switch oriented vertically down Figure 4C gravity acts in the opposite direction and opposes the spring s force Thus with the same setpoint adjustment a switc
19. he switch but also to prevent dust or moisture ingression to the switch internals 2 11 2 Examine Cable Insulation for Nicks and Cuts In some cases properly rated cable may be installed without solid or flexible conduit to CAUTION Do not over or under torque housing screws Over torqueing can damage the housing and compro mise the seal Under torqueing can permit moisture to weep into the switch Either condition can compromise switch operation and or present an electrical shock hazard METRIX Doc 1231558 e REV B Oct 2014 Page 10 of 20 EE preclude it as a potential source of moisture collection However whether installed with or without conduit all cables should be examined for nicks and cuts that compromise the protective outer jacketing In particular multi conductor cables can act as very effective wicks when the outer jacket has been cut or damaged Once moisture ingresses into the cable it will often find its way into the switch via this wicking mechanism even when an appropriate gland seal is used at the switch s conduit opening and the outer periphery of the cable is not leaking at the gland 2 11 3 Liberally Apply Silicone Dielectric Grease to all Openings The primary points of moisture entry into the switch are where the housing is penetrated The setpoint adjustment screw 5550 only The reset plunger 5550 only The conduit fitting s The seal between housing body and housing cover O ring seals and
20. he switch on the machine following the guidelines of section 3 Ensure the field wiring is disconnected If it has already been connected disconnect temporarily METRIX a ence pon eee Doc 1231558 e REV B Oct 2014 Page 13 of 20 l Pag taking appropriate cautions around any wiring that is or may become energized during machine starting sequences and the setpoint adjustment procedure 4 2 3 Reset the switch by depressing the reset plunger 5550 or manually pushing the exposed trip plate into its untripped position 5550G 4 2 4 Connect a continuity tester or ohmmeter across COM amp NOM OPEN terminals refer to Figure 10 This will allow you to visually confirm when the normally open relay contacts close indicating the switch has tripped This is also true for COM amp NOM CLOSE the normally closed relays contacts open when tripped NOTE This step accomplishes two objectives First it allows the in staller to easily ascertain when the switch has snapped from its un tripped state to its tripped state as it may be difficult or impossible to listen for an audible click in the presence of ambient machine noise Second it allows appropriate setpoint adjustments to be made without unnecessary trips of the machine repeated starts stops on a machine are usually undesirable and may be electrically and or mechanically damaging in some circumstances 4 2 5 Hold the reset plunger 5550 or trip plate 5550G down and start
21. is identical in terms of its internal mechanisms but has a different housing that is rated for use in the more stringent IIC gas group For additional in formation on models 5550 and 5550G including outline diagrams Metrix specifications and ordering information refer to Metrix product datasheet 1004461 Refer also to hazardous area installation manuals M8905 5550 and 100356 5550G as appropriate METRIX Doc 1231558 e REV B Oct 2014 Page 18 of 20 N 7 HAZARDOUS AREA APPROVALS IECEx Approval World ATEX Approval Europe UL Approval North America METRIX IEC Markings Ex d IIB H2 T6 Gb Ex tb IIIC T85 C Db Ta 40 C to 70 C IP66 IECEx BAS10 0020 ATEX Markings Ex 2GD Exd IIB H2 T6 Gb Ex tb IIIC T85 C Db Ta 40 C to 70 C IP66 CE Baseefa 10ATEX0098 UL Markings Ous LISTED Models 5550 2XX XXX or 5550 7XX XXXZ Class Div 1 Groups B C D Class Il Div 1 Groups E F G Type 4 or 4X IP66 Models 5550 1XX XXX or 5550 6XX XXX Class Div 1 Groups C D Class Il Div 1 Groups E F G Type 4 or 4X IP66 IEC Standards IEC60079 0 2011 IEC600079 1 2007 IEC600079 31 2008 EN Standards EN60079 0 2012 EN60079 1 2007 EN60079 31 2009 UL CSA Standards UL 698 UL 508 CSA C22 2 No 25 CSA C22 2 No 30 CSA C22 2 No 14 CAUTION TO REDUCE RISK OF IGNITION OF HAZARDOUS ATMO SPHERES DISCONNECT THE SUPPLY CIRCUIT BEFORE OPENING KEEP ASSEMBLY
22. ith a sole noid mechanism When voltage is continuously applied current flows in the circuit and the thermistor s temperature rises gradually restricting current flow When the current drops below the minimum value required to keep the coil energized the solenoid retracts Nor mally it takes approximately 30 seconds for the thermistor to reach this cut off tempera ture However several factors can serve to shorten or lengthen this interval as follows e Ambient Temperature Effects The time for the thermistor to reach its cut off value depends on the initial tem perature of the thermistor If the switch is at an ambient temperature of 30C dur ing the winter months it will exhibit a longer startup delay than during the summer months when ambient temperatures may be 30C Likewise if the switch is placed on a machine that can sustain a large temperature rise at the mounting location the switch may be near its maximum temperature rating of 70C after a period of prolonged operation This will shorten the startup delay interval when compared to operation on a cold machine METRIX Doc 1231558 e REV B Oct 2014 Page 16 of 20 Emm N e Cool Down Period If the circuit activating the startup delay leaves the voltage continuously applied as is typical the thermistor will remain hot until voltage is removed such as follow ing a machine trip Thus when the thermistor is not allowed to cool to its ambient surroundings it will shorten
23. n its untripped state even in the pres ence of high vibration encountered during machine startup If the reset coil supplied will not hold the switch in an untripped state during startup it may be the wrong size Refer to Table 1 and consult the factory for assistance METRIX Doc 1231558 REV B Oct 2014 Page 17 of 20 Le l Pag A 5 3 2 Duration Considerations The duration of the startup delay approximately 30 seconds is factory set and cannot be altered With the switch in an untripped state continuous application of the specified voltage to the reset terminals will initiate the delay feature but will not cause it to persist That is applying a continuous voltage across the reset terminals for longer than 20 30 seconds does not allow one to arbitrarily increase the duration of the startup delay See section 5 2 1 for a more in depth explanation of the circuit operation NOTE The 24 VDC reset coil comes in three different versions depending on the holding strength option specified option C Although each has the same min max voltage rating the current draw will be larger for larger holding coil strengths as noted in Table 1 Be certain your power source for this coil is capable of supplying the neces sary current for the rated holding strength 6 DRAWINGS SPECIFICATIONS AND ORDERING INFORMATION Unless otherwise noted all figures and illustrations in this manual depict the model 5550 mechanical switch The 5550G
24. only using the plunger pushbutton to allow a hot restart Alternatively it may be desirable to program the machine s control system to ap ply voltage to the reset coil for only 30 40 seconds during machine start up This practice ensures that the thermistor is more likely to be cold following a trip allowing an immediate remote reset 5 2 Startup Delay The startup delay feature is intended for use in machines that exhibit high vibration during startup This feature maintains the switch in an untripped position for a factory pre set delay period of approximately 30 seconds after which the switch resumes normal operation To activate startup delay continuously apply the specified voltage across the reset terminals and the switch will be suppressed from tripping for the preset delay period allowing the machine to run up to operating speed and normal vibration levels Voltage must be continu ously applied for the duration of the startup delay approximately 30 seconds If this volt age is removed prematurely the coil will de energize and the switch will not be suppressed from tripping WARNING Voltages present at reset terminals can result in serious injury or death Always de energize these circuits prior to installation or maintenance and use ap propriate lock out tag out procedures where applicable 5 2 1 Thermistor Considerations The startup delay feature works through use of an internal thermistor in series w
25. ration Instead mount the switch as shown in Figure 5 to ensure that radial not axial vibration is detected Mount the switch as shown in Figure 7 only when the machine actually vibrates more in the vertical than horizontal direction or when the 2 g 24 V reset coil option is used see note in section 2 4 SHAFT CENTERLINE BASEPLATE CONDUIT n 5550 MOUNTING LOCATION WITH CONDUIT FITTING FACING DOWN SIDE VIEW NOTE A drain hole at low point is recommended to allow accumulated moisture to exit except in explosion proof installations Shaft Radial Y Axis SIXV Z LHVHS CONDUIT Shaft Radial X Axis Figure 8 Vertical Machine showing horizontal 5550 mounting orientation and recommended location METRIX Doc 1231558 REV B Oct 2014 Page 7 of 20 l Pag 2 7 Mounting Rotation The switch can be rotated about its sensitive axis without affecting its operation Figure 9 Thus positions 9A 9B 9C and 9D showing the model 5550 switch rotated at 12 00 3 00 6 00 and 9 00 positions respectively do not affect the operation of the switch and are pri marily a matter of preference and serviceability However when possible it is recommend ed that conduit fittings be oriented facing down helping to prevent moisture or condensa tion accumulation inside the device GRAVITY FT T T T t H i SE s UE VIBRATION amp wrrcH
26. rip point if the machine trips due to high vibration during startup CAUTION The switch s setpoint must be established relative The startup delay feature optional on 5550 standard on 5550G is specifically designed to suppress the switch from tripping for a pre set interval during startup Elevating the setpoint to accommodate start up vibration levels can result in missed trips during genuine machinery malfunction conditions and constitutes a misuse of the switch 5 ELECTRICAL RESET AND STARTUP DELAY When a reset coil is specified standard on 5550G optional on 5550 where ordering option D 1 2 3 or 4 an electrical solenoid mechanism is installed that allows remote reset of the switch when in its tripped position and initiation of a startup delay when in its untripped position To activate these features the rated voltage must be applied to the reset coil wir ing terminals refer to Figure 10 The reset function requires only momentary application of voltage The startup delay function requires continuous application of voltage for the dura tion of the factory pre set time delay approximately 20 30 seconds 5 1 Electrical Remote Reset This feature allows remote reset of the switch from its tripped position To activate momentarily apply the rated voltage across the appropriate terminals refer to Figure 10 taking care to observe the polarity The application of this voltage will energize the solenoid mechanism e
27. the machine When the machine has reached running speed release the plunger 5550 or trip plate 5550G 4 2 6 If the switch trips when releasing the plunger trip plate rotate the setpoint screw a full turn 360 degrees CW and then depress the plunger trip plate holding it in the untripped position Release the plunger trip plate once again and watch to see if the switch trips Repeat this process until the switch does not trip with the machine running at normal operating speed Then proceed to step 4 2 7 4 2 7 With the machine running SLOWLY turn the setpoint adjustment screw CCW in 1 8th turn increments until the switch trips Then turn the screw in the opposite direc tion CW 1 8th turn and reset the switch 4 2 8 Allow the machine to run for as long as necessary to ensure the switch does not trip under normal speed load and other operating condition changes If the switch does not trip proceed to step 4 2 10 If it trips proceed to step 4 2 9 4 2 9 Perform this step only if the switch tripped in step 4 2 8 Turn the setpoint adjustment screw in the CW direction increasing setpoint in the smallest increment pos sible preferably 1 16th turn or less Reset the switch and repeat step 4 2 8 NOTE The objective is to establish a setpoint as close as possible to normal operating conditions while still allowing normal fluctuations in speed load flow etc without false trips Establishing a setpoint that is too high may
28. the startup delay e Immediate Restart If a restart is required immediately following a trip the thermistor may be so hot that the switch cannot be immediately reset using the remote reset function In such situations it will be necessary to either manually reset the switch or wait for the thermistor to cool sufficiently Alternatively it may be desirable to modify the machinery control logic such that voltage is only applied to the reset terminals for the duration of the factory pre set delay ensuring that the thermistor circuit is only energized at startup e Current Flow The amount of current flowing through the thermistor will be a function of the volt age applied the thermistor s resistance and the resistance elsewhere in the circuit Loose intermittent or corroded wiring connections can increase resistance and result in a longer startup delay interval If the resistance is too great the reset coil will not energize at all due to insufficient current Insufficient voltage and or current can also be a problem Be certain that the coil voltage rating ordering option D matches the voltage and current your circuit supplies See Table 1 on the following page 24 Ve 0 3 Table 1 Reset Startup Delay Coil Electrical Characteristics 5 3 Coil Considerations 5 3 1 Coil Hold Strength The reset startup delay coil is sized to provide a specified holding strength option C al lowing the startup delay feature to hold the switch i
29. to adjustments The 5550G is used for haz ardous area applications requiring gas group IIC approvals but has no externally accessible adjustments The 5550 has externally available setpoint adjustment and reset facilities and can be used for applications up to gas group IIB hydrogen Refer to hazardous area instal lation manuals M8905 model 5550 and 100356 model 5550G for additional information The operating mechanism is purely mechanical and consists of a tension spring attached to a pivoting plate on an over center fulcrum magnets are not employed Normally this plate is in an untripped position Figure 1A However in the presence of sufficient seismic acceleration whether vibratory or impact the trip plate will pivot beyond this over center position snapping to a stable tripped position Figure 1B where it contacts an internal Figure 1A 5550 mechanical switch trip micro switch relay changing the state of the relay mechanism in untripped position Micro This relay is available for external wiring connec switch red is not actuated tions where on off changes in electrical continuity can be used to trip the machine and or annunci ate excessive vibration After the switch assumes its tripped position it must be reset manually by means of the external reset plunger 5550 only or by means of a remote electrical reset standard on 5550G optional on 5550 The remote reset capability can also be used as a Startup d
30. ure 10 for wiring terminal assignments METRIX Doc 1231558 REV B Oct 2014 Page 8 of 20 EET WIRING DIAGRAM SPOT DPDT NOTE It is not recommended that wiring be connected to the device until after verifying the factory default setpoint in Section 4 1 and performing the in situ setpoint NOM NOM OPEN C OPEN COM NOM NOM CLOSED CLOSED NOM e adjustments in Section 4 2 This will pre vent having to disconnect the wiring and remove the device from its mounting loca tion It will also prevent unwanted trips while initially adjusting the setpoint OPEN NOM CLOSED L 4 e RESET COIL L e RESET COIL ae a a 2 Ee GRN GRN NO e RESET COIL No A RESET COIL WARNING Voltages present at DPDT CONTACTS AND RESET COIL OPTION switch terminals can result in de energize these circuits prior to installation or maintenance and use appropriate lock out tag out proce dures where applicable When wiring the device observe the following 2 9 1 Do not exceed switch contact ratings listed on the nameplate 2 9 2 Comply with all applicable electrical codes 2 9 3 Keep field wiring away from the moving parts of the trip plate mechanism CAUTION If field wiring is allowed to obstruct the moving parts of the switch it may prevent the trip plate from operating correctly Machinery protec tion can be compromised and serious machinery damage and or personnel injury may result 2 9 4 All power must be switch
31. ve procedure Continue adjusting in 1 16th CCW turn increments until the unit trips when turned from right side up to upside down When per forming this verification on the Model 5550G it is recommended that you leave the cover off The presence or absence of the cover does not affect the setpoint during the verification process and ensures the cover does not have to be repeatedly removed and reinstalled to adjust the setpoint and reset the trip plate However never remove the cover with ener gized wiring connected remove power before opening cover 1 8th turn CW and press the reset button Repeat this pro cedure adjusting 1 8th of a turn each time until the device can be reset While performing this procedure keep the device sitting on a flat sur face with the cover side facing up y d Audible click should be heard as switch approaches 180 degrees and snaps to its tripped state NOTE If the switch will not reset adjust the setpoint screw Figure 12 Verifying the factory default setpoint on the 5550 4 2 In Situ Setpoint Adjustment The setpoint adjustment is accessible externally on the model 5550 see Figure 3 For model 5550G the lid must be removed Follow the steps below to adjust the setpoint for the par ticulars of your machine 4 2 1 Verify the factory setpoint as described in 4 1 above Then rotate the adjustment screw one full turn 360 degrees clockwise and proceed to step 4 2 2 4 2 2 Install t
32. xtending its plunger and resetting the switch to its untripped position Once the solenoid has reset the switch voltage can be removed The switch will remain in its untripped position until sufficient acceleration trips it 5 1 1 Continuous Bypass It is not possible to continuously bypass the switch using the reset function A continu ous voltage across the reset terminals will activate the startup delay feature lasting approximately 20 30 seconds after which the switch will return to normal operation If a continuous bypass function is required an isolation switch should be installed in the same METRIX en ence pens ae TENUIS Doc 1231558 e REV B Oct 2014 Page 15 of 20 l Pag circuit as the output relay s allowing the 5550 5550G to be removed from the machinery shutdown loop NOTE The reset coil circuit contains a thermistor that allows the circuit to also function as a startup delay when voltage is continuously applied see section 5 2 If the thermistor is hot current will not flow and the reset function will not operate A cool down period may be required see Section 5 2 1 In many applications voltage is continuously applied to the reset coil ter minals while the machine is running In such situations the thermistor will still be hot immediately following a trip and it will not be possible to electrically reset the switch until the thermistor has cooled sufficiently If necessary the switch can be manually reset 5550
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