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User Manual QT series generation 2.5, ID 2021, rev 3.2, January 14, 2022

Lubricate threads with a lubricant giving friction coefficient between 0.08 to
0.14. To prevent galling when using stainless steel fasteners, a lubricant
containing MoS2 is recommended.

Stainless steel fasteners tend to gall while being tightened. The risk of
galling or thread seizing can be reduced by:

•

Using recommended lubrication.

•

Tighten the screws in the sequence indicated in the figure below.

•

Tighten fasteners with low rpms, without interruptions.

•

Apply only light pressure.

Figure 50: Tightening sequence for M4 screws

Summary of Contents for QT Series

Page 1: ...ID 2021 rev 3 2 January 14 2022 User Manual QT series generation 2 5 ...

Page 2: ...y Date 3 2 DB Added Dual Power option JMG 14 01 2022 Copyright 2022 Eltorque AS This document is submitted in confidence and contains proprietary information which shall not be reproduced or transferred to others for the purpose tender or any other intensions without written permission of Eltorque AS ...

Page 3: ...esign 25 3 9 2 Duty performance 25 3 9 3 Endurance 25 3 9 4 Shielding considerations 26 3 9 5 Communication interface considerations 26 3 9 6 Cabling considerations 27 3 9 7 Installations with Eltorque Hybrid Marine Cable 28 3 9 8 Orientation 29 3 9 9 Space requirements 29 3 9 10 Mounting 32 3 9 11 Additional information adaption actuator valve 32 3 9 12 Torque considerations for valve and actuato...

Page 4: ...pply connection 62 Chapter 11 Failsafe Option 63 11 1 Disposal and waste handling 64 11 2 Product Description 64 11 2 1 Failsafe actuator components 64 11 3 Planning 64 11 3 1 Technical differences between standard and failsafe actuator 65 11 3 2 Considerations for products with batteries during installation 65 11 3 3 Available Failsafe protocols 66 11 3 4 Maintenance plan 66 11 3 5 Storage 67 11 ...

Page 5: ...Table of Contents User Manual QT series generation 2 5 ID 2021 rev 3 2 January 14 2022 Page 5 of 88 A 3 M4 screws on communication interface box 84 Earthing Methods in Maritime Installations 85 ...

Page 6: ......

Page 7: ...ay solution with low installation costs and a high level of security By combining the Eltorque actuators with the Eltorque Hybrid Marine Cable the installation cost is further reduced The bus connected actuator eliminates the cable clutter transportation loss and air or oil leakage associated with conventional actuators The use of permanent magnet based motor technology and efficient electric mech...

Page 8: ...log Digital and CAN interfaces see Product Description in Chapter 3 Failsafe An actuator configured as Failsafe is functional extension with additional battery of Analog Digital CAN actuator see Product Description in chapter 11 2 CANOnly An CAN actuator contain only the CAN bus interface CAN bus interface can be configured as Single CAN or Dual CAN See Product description in chapter 9 1 Dual Powe...

Page 9: ...perature providing high operational safety Robust implementation of CAN bus CAN bus protocol ensuring a reliable bus connection Reduced power consumption that gives a greener profile The self lock feature allows movements from the motor but immediately locks movements from the valve side Fast and precise motor that reduces the closing time Low start up load enables a high number of actuators per p...

Page 10: ...ect and engineering personnel Installation personnel Operators Supervisors Technical support personnel Technical management personnel The following notations have been used in this manual Bold is used for commands and menu selection Italic is used to emphasize information It is also used for names of documents referred to in the manual Note A note is used to draw attention to important or helpful ...

Page 11: ...ontrol utilizing analog signals e g 4 20 mA Allows positioning of the valve actuator between Open and Closed BTO Break to open The torque required to unseat the closed valve CAN CAN bus Controller Area Network CANopen CANopen is a higher level protocol running on top of the CAN bus CCS Central Control System Communication Interface Box Electronic device controlling the actuator according to signal...

Page 12: ...ion model The model is a conceptual model that standardizes communication systems without regard to the underlying internal structure The model partitions a communication system into abstraction layers Out of range Definition of position The outgoing shaft is outside the defined position area PF Power factor PCB Printed circuit board PLC Programmable Logic Controller Power loss The power supply is...

Page 13: ...llation on valves and the electrical installation of power and control signal The reader group for this chapter is installation personnel Chapter 5 covers the use of the actuator such as how to use the manual emergency operation There is also an overview of error messages and a troubleshooting overview The reader group for this chapter is operators Chapter 6 covers maintenance inspection and repai...

Page 14: ...verview of torque recommendations for actuator bolts The reader group for this chapter is installation personnel Appendix B includes the document Earthing Methodology in Maritime Installations The reader group for this chapter is installation personnel technical support and technical management personnel ...

Page 15: ...and installed by personnel with certifications according to applicable laws and regulations Ensure that all such work is done according to applicable laws and regulations Service must always be performed by trained personnel All batteries and electronic equipment may contain substances harmful to the environment Therefore after removing used equipment return them for disposal according to local go...

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Page 17: ...ation 2 5 is fragmented in to five products QT70 QT250 QT400 QT800 and QT1000 See relevant datasheet for details Figure 2 Actuator mounted on a valve The actuator must be integrated with the main control system in one of two ways Directly to the main control system In this case it is important to consider the communication protocol Through a stand alone sub system delivered by Eltorque This is a s...

Page 18: ... sensors can also be connected to the E VCS The E VCS includes an HMI interface on the cabinet and can also support an HMI interface on the main control level Figure 3 Eltorque Valve Control System E VCS with valve and pump control Figure 4 shows Eltorque actuators connected directly to customer specific PLC PC or other control units In addition Eltorque actuators support digital and analog connec...

Page 19: ...tegrated through a stand alone sub system delivered by Eltorque The solution illustrated in Figure 5 shows a ring connection with the Eltorque Hybrid Marine Cable and Dual CAN communication from two sides The Eltorque Dual CAN actuators are connected to a cabinet with an Eltorque valve control system E VCS In this example pump starters are also connected to the E VCS Other equipment such as sensor...

Page 20: ... connected directly to a customer specific PLC PC or other control unit In addition Eltorque actuators support digital and analog connections On system level the PLC PC or Controller must be compliant with Eltorque communication protocol according to Eltorque System Integrators Manual CANopen Interface Figure 6 Eltorque actuator dual CAN loop connected to Integrated Automation Control System IAS o...

Page 21: ...Figure 8 show describes exterior of the QT70 QT70 QT250 and QT400 external construction and QT800 and QT1000 external construction respectively Bottom view Bottom view Top view Figure 7 QT70 QT250 and QT400 external construction Bottom view Top view Figure 8 QT800 and QT1000 external construction ...

Page 22: ...itches and indicator lamps Alternatively it can be controlled from a PLC with digital inputs and outputs Analog interface allowing regulating valves where positioning of the valve is needed The actuator provides continuous feedback of its actual position for comparison between desired and actual position Both positioning and feedback signals are analog 4 20 mA The Analog Interface also has a digit...

Page 23: ...ation interface box are shown in Figure 11 The labels describe HW FW version at delivery time signals on CAN terminal X1 digital terminal X2 analog terminal X3 placement of label for X5 terminal and Terminal Block Connections The last label is placed on the separation plate Figure 11 Label overview inside the communication interface box ...

Page 24: ...but not cabled please ensure that all glands and gland holes are thoroughly tightened to avoid moisture ingress The actuator s IP rating is not valid until correctly installed Eltorque cannot accept responsibility for deterioration caused on site if the actuator has been opened in ways not described in this manual In principle the product should be powered within three years after production to pr...

Page 25: ...ter 4 7 2 2 b For classes C and D modulating and continuous modulating duty performance is defined as the minimum number of starts per hour where one start consists of a movement of at least 1 In either direction with a load of at least 30 of the rated torque EN 15714 2 chapter 4 7 2 2 c Rotating electrical machines chapter 4 2 Duty type S2 Operation at a constant load for a given time less than t...

Page 26: ... Eltorque recommends a maximum of 80 nodes on 500 m 1660 ft cable Note For the Dual CAN configuration Eltorque recommends no more than 75 nodes on 500 m Hybrid marine cable Note The cable between the nodes can be maximum 500m with bus speed with the Eltorque Hybrid Marine Cable For other data rates and cable lengths check with Eltorque service department Table 4 Cable requirements and recommendati...

Page 27: ...ative and we will help you to get the correct set up Cable termination For Hybrid Marine cable nominal 120 Ω Both Dual CAN inputs on the actuator must be impedance matched to the characteristic impedance of the cable used When projected by Eltorque this is handled by our project personnel For the analog interfaces both the input and the outputs are passive Analog has two outputs One Alarm output a...

Page 28: ...dly the most cost effective installation method Eltorque has developed a ground breaking Hybrid CAN bus Power cable especially designed for maritime applications Figure 13 Bus connection of actuators The Eltorque Hybrid Marine Cable combines signal and power cable in a hybrid cable with maritime type approval The cable can only be used for installations with CANopen communication interface box Whe...

Page 29: ...date both power and signal cables When ordering please inform if you intend to use the Hybrid Marine cable or a standard cable The actuator can freely be mounted both vertically standing or horizontally lying to the side An upside down hanging position should be avoided Figure 15 QT70 QT250 and QT400 dimensions Figure 16 QT800 and QT1000 dimensions ...

Page 30: ...ation service and manual operation There must be a minimum of 150 mm 5 9 in space above and to the sides of the actuator to accommodate room for installation operation and service In front of the communication interface box there should be at least 200 mm 7 9 in Figure 17 QT70 QT250 and QT400 Space requirements for installation service and manual operation side view ...

Page 31: ... rev 3 2 January 14 2022 Page 31 of 88 Figure 18 QT70 QT250 and QT400 Space requirements for installation service and manual operation top view Figure 19 QT800 and QT1000 Space requirements for installation service and manual operation side view ...

Page 32: ... is necessary to use an adaptor Various adaptors are available but the two most common ones are the square reducer and the flange stem adapter When buying actuator and valves together from Eltorque this is handled by our project personnel If you order just the actuator take care to verify the critical dimensions and whether the valve has a parallel or standard configuration Square reducers might b...

Page 33: ... most suitable actuator to use The break to open torque is defined as the torque required to move the valve out of the seat Be aware that the MAST of the valve needs to be verified to prevent damage to the stem Eltorque can assist in selecting the correct actuator size for the valve For the QT series the closing time is configurable within a predesigned interval The opening and closing profiles ar...

Page 34: ...d always insert two pieces with QT250 and QT400 The QT70 QT800 and QT1000 only has room for one 6 Check that the actuator is correctly positioned on the valve The actuator s interface box should be placed in the same direction as the piping see Figure 22 If square reducers are needed see section 3 9 11 Additional information adaption actuator valve on page 32 7 Remove the top cover and use the han...

Page 35: ...021 rev 3 2 January 14 2022 Page 35 of 88 Figure 22 Piping direction The actuator provides fastening holes of different dimensions to facilitate mounting on different types of valves Figure 23 QT70 QT250 and QT400 Valve flange fastening holes ...

Page 36: ...g allowed to do any work on installations The supply voltage must be 1 phase 110 240V AC 50 60 Hz Max 100 VA Make sure the fuses are disconnected before you open the Communication Interface Box If ferrules are used the sole responsibility for a correct installation lies on the installing party Caution When using stranded wires make sure that all wire strands are properly fastened in the spring con...

Page 37: ...em according to the type of communication interface box used See section 4 8 7 Connect the configuration medium to X5 configuration connector if applicable Note When re assembling the communication interface box with the actuator make sure that no wires are jammed between the surfaces and that the screws are cross tightened It is also recommended to apply some seal lubrication on the gasket to ens...

Page 38: ... to ensure correct positioning of all parts For other glands follow the instructions from the supplier Figure 26 Mounting of cable gland Note The connection of the power supply is identical for all types of communication interface boxes for QT series actuators Figure 27 shows the location of the terminal X4 with a pinout for incoming and outgoing power cables Each actuator has a double power suppl...

Page 39: ...n Maritime Installations on page 85 for information on the connection of screen for the last actuator in the loop actuator N For maximum personnel and equipment protection the installation shall comply with Guidelines for earthing in maritime installations published by The Norwegian Electrical Safety Directorate Failing to do so may void the warranty Exception Field equipment shall be grounded thr...

Page 40: ... that are integrated parts of internal components of the equipment such as relays and contactors Also see Appendix B Earthing Methods in Maritime Installations on page 85 Note Not following the recommended earthing guidelines may result in unwanted system behavior Strip the wire end to 8 9 mm 0 31in 0 35in Insert the wires according to the labeling All terminals can accommodate wires of cross sect...

Page 41: ...st unit and signal pinout Note The cable termination is set on the last unit in the loop by using a 0 75mm2 wire and connect pin A5 with pin B2 on the CANopen connector see Figure 29 Figure 29 CANopen connection interface terminals An example of a CAN installation for n 2 nodes with a CANopen controller is shown in Figure 30 Figure 30 Example of CANopen network connections ...

Page 42: ...the Dual CAN connector X1 see Figure 31 The termination must be present on all Dual CAN nodes Actuators with incorrect termination might cause communication errors Figure 31 Dual CAN connectors Figure 32 shows a typical dual CAN network with termination for n 2 nodes and two CAN controllers Figure 32 Dual CAN network connection For information on how to set the node ID please consult the Eltorque ...

Page 43: ...y to CANOnly Figure 33 Digital connection interface terminals The digital interface can be used in various control circuits Two examples are shown in Figure 34 Figure 34 Digital interface options Caution The Common input terminal D1 on X2 is active and has an internal power supply of 5 V 50 mA Do not attempt to connect an external supply to this terminal as it can damage the communication interfac...

Page 44: ... of the Analog Interface connector X3 and signal pinout Specifications for IOs are given in section 3 7 1 Note This chapter does not apply to CANOnly Figure 35 Analog connection interface terminals An example of using the analog interface is shown in Figure 36 Figure 36 Example of 4 20 mA analog control circuit ...

Page 45: ... output torque for handwheel Input torque on the handwheel Nm Output torque on the actuator Nm QT70 QT250 QT400 QT800 QT1000 1 19 75 90 225 311 2 38 150 180 450 622 3 57 225 270 675 933 4 76 300 360 900 1244 Note A manual operation will most likely result in an error message in the system 1 Remove the hand wheel cover by grabbing the tabs and pulling it straight up 2 Turn the hand wheel clockwise ...

Page 46: ...r TORQUE is active Reaction from actuator None for the GENERAL alarm itself but the other active alarms that are active have reactions Reset conditions The alarms POSITION UNDEFINED TEMPERATURE and TORQUE must be inactive Trigger conditions The outgoing shaft of the actuator is out of range Reaction from actuator None besides an active alarm Reset conditions The outgoing shaft must be run back wit...

Page 47: ...f the actuator is near the maximum operating temperature of the internal electronics This may happen if the environmental temperature is higher than the maximum rated temperature for the actuator or if the actuator has been run with a higher duty cycle than specified in section 3 3 Reaction from actuator The voltage to the motor is cut off if the temperature increases above the maximum operating t...

Page 48: ...ed via the bus communication The actuator can operate the valve but the operation time is longer or shorter than desired Change the actuator s speed by using the E3C configuration software as described in the Eltorque E3C Manual On bus control systems speed can be adjusted via the bus communication The actuator s alarm output is active on a bus system it gives temperature alarm The actuator respon...

Page 49: ...he Eltorque E3C Manual OR The digital or analog control system is not wired or configured correctly The actuator does not respond either to control signals or when tested with E3C Restart the actuator power on off Verify the power supply with a voltage meter If the power is OK the communication interface box is defect and must be replaced After replacement of interface the actuator does not operat...

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Page 51: ...d operation shaft are lubricated If they seem to be dry follow the procedure in 6 4 Check for corrosion or other physical damage Perform a test run for each actuator from the control unit Eltorque recommends that the unit is inspected for damage by Eltorque qualified personnel if the actuator has been submerged in seawater See Appendix A Torque and Screw Recommendations on page 83 The top cover ga...

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Page 53: ...typically anodized CED coated and steel parts treated with Dacromet and painted The Eltorque communication interface consists of three main modules 1 Power supply 2 Motor control 3 Interface Figure 39 Communication interface schematics For more technical information about the Eltorque CANopen communication refer to the System Integrators Manual CANopen interface ID 1691 For more technical informat...

Page 54: ... and lamps or PLC As shown in the illustration above actuators with the digital interface can be controlled directly from a conventional panel with buttons switches and indicator lamps Alternatively it can be controlled from a controller with Digital inputs and outputs This allows extended functionality in terms of automatic control and visual user interface on display In case both the Close and O...

Page 55: ... mA control signal is lost Note This chapter does not apply to CANOnly Figure 41 Analogue level and flow control Note The accuracy of an actuator with analog interface is 5 if the control signal is 12 mA 50 the valve position is in the range of 45 55 If higher accuracy is needed please consider a CAN bus interface with an accuracy of 0 5 instead ...

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Page 57: ...s more robust to short circuits and break in the cable The actuators can be connected in a bus topology like before In addition the system installations utilizing Dual CAN allow a redundant PLC to be connected at the other end of the CAN bus This introduces a possibility to retain full control of all actuators in the event of a single signal cable failure short circuit breakage etc Note Due to its...

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Page 59: ...scribes the CANOnly option The CANOnly supports only the CAN interface and can t be combined with the failsafe option The CANOnly can be configured as Single CAN or Dual CAN interface This configuration shall be used in the situation where a customer doesn t require digital and or analog interfaces ...

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Page 61: ...nalysis The focus of the analysis is voltage drop Factors contributing but not limited to the voltage drop are the following cross section of the backbone cable length of the backbone cable cross section of the cable stub length of the cable stub maximum of actuators active simultaneously The critical system parameter to consider is the lowest allowed battery voltage Figure 42 shows a draft of an ...

Page 62: ...GO 221 412 or similar splicing connectors one for the ground conductor and one for the hot conductor Leads in the interface box are black and red for ground and hot conductors respectively The splicing connector accepts 0 14 mm 4 mm 24 AWG to 12 AWG conductor sizes Strip conductor to 11 mm insert the conductor in the splicing connector and secure it For connecting the main power supply follow the ...

Page 63: ...ion A self lock function that ensures that the actuator is kept in position Additionally the following options are available A Dual CAN option providing a more robust CAN network A Failsafe option providing and UPS back up battery This appendix describes the Failsafe option The Dual CAN option is described in Chapter 8 Dual CAN on page 57 Note The failsafe actuator supports CAN digital and analog ...

Page 64: ...e the certified temperature rating is reduced and the overall size is increased Still it enables the internal power source for a pre defined operation after a signal or power loss Both these interruptions are individually adjustable by a predefined time delay Figure 44 Actuator with Failsafe option The bottom views for the motor and gear housing and the communication interface box are identical to...

Page 65: ... months after reception please refer to section 11 3 5 for input on proper storage conditions It is important to consider the information below when planning the installation of the failsafe actuators Due to it being a solution with a battery it cannot sit without external power for an unlimited time due to self draining See Table 11 Battery lifetime below for details on expected battery lifetime ...

Page 66: ...as temperature The failsafe option offers a safety aspect in terms of operation after a failure As there are an internal battery and onboard management it is possible to preprogram the actuator to move to the predefined safest position when contact with the actuator is lost The failsafe function supports the following protocols Fail maintain The actuator keeps the position Fail to open The actuato...

Page 67: ...above the limits for storage set by Eltorque maintenance charging needs to be done The below instruction is the Eltorque recommendation when charging is needed The battery should be charged with CC CV charging algorithm 900mA constant current CC up to 14 7V When the charging voltage reaches 14 7V keep the voltage constant CV and stop charging when the charging current reaches 90mA or after 32 hour...

Page 68: ... with Failsafe Space requirements for installation service and manual operation Figure 47 QT series with Failsafe Space requirements for installation service and manual operation The failsafe actuator has several configurable parameters The tables below show the parameters that trigger the failsafe protocol and other important parameters necessary to adjust for correct error behavior ...

Page 69: ... above critical State of Health below minimum State of Charge below minimum Disabled 65535 or adjustable between 0 65534 seconds Table 13 Other important configurable parameters Parameter Action Purpose Adjustable Range Heartbeat Good Timeout Timer for ensuring that the heartbeat is present for the requested time period before reporting all OK to IAS 0 255 seconds The Failsafe actuator is mounted ...

Page 70: ...the battery on each unit Depending on the selected installation plan the necessary operations will be different Below is a summary of both options See section 11 8 2 Changing battery on page 72 Installation method A Follow step 1 4 and 12 16 Installation method B Follow step 1 16 Remove the six hexagon socket cap nuts holding the interface to the actuator The nuts and bolts are circled in red in t...

Page 71: ...eep mode unless the battery and power are detached for min 30 seconds before attaching again It is not possible to access this state from IAS E3C In normal state the actuator works as a standard QT Series generation 2 5 and can receive commands from IAS E3C However if the failsafe state or service state has been activated the normal state is only resumed if failsafe or service is cleared from the ...

Page 72: ...vated to avoid possible personnel injuries or material damage When cleared the actuator resumes normal or failsafe state whichever was active before the initiating of service state Once the service state is no longer required it is cleared remotely via the IAS or E3C Service state may be set by manually operating the handwheel or from the IAS E3C The state must be reset from the IAS E3C For inform...

Page 73: ... LED1 battery status LED2 Actuator status Battery Health Good Green Battery Health Good and supplying Blink Green Battery Health Under Warning Yellow Battery Health Under Warning and supplying Blink Yellow Battery Health Under Critical Red Battery Health Under Critical and supplying Blink Red Actuator Normal Green Actuator Service Yellow Actuator Failsafe Red Problem description Cause and solution...

Page 74: ... Test 3 The actuator automatically charges the battery to 100 4 The bit BATTDIS indicates that the test is performed 5 When the battery reaches 0 the BATTDIS is automatically cleared the SOH value is updated and the battery is recharged 6 When the battery has reached the lower limit for SOC service mode can be cleared and the actuator resumes normal operation This procedure describes how to change...

Page 75: ...move the nuts by turning them counterclockwise Place the nuts in a secure location The interface and failsafe module are loose when the nuts are removed Make sure that the interface and failsafe module does not fall off Required equipment 4mm Hexagon Key 4 Remove the interface as shown in the illustration Make sure to not drop the interface or to let it hang by the cables 5 Disconnect the battery ...

Page 76: ... illustration Place the screws and connector in a secure location Required equipment 2 5mm Hexagon Key 9 Remove the battery by sliding it out of the frame Replace the battery and slide the new battery into the frame 10 Fasten the battery holding bracket with the four M3 hex socket head screws by turning them clockwise Tighten the screws to 1 2Nm and lubricate the threads using Molykote 1000 or sim...

Page 77: ...y connector marked by a yellow circle in the illustration 13 Place the interface back on the actuator Make sure no cables get caught on the sealing surface between the interface and the actuator Make sure to not drop the interface or to let it hang by the cables 14 Fasten the interface with the six hexagon socket cap nuts by turning them clockwise Note the correct sequence for tightening the nuts ...

Page 78: ...s that the battery change procedure is going to be performed on before proceeding to the next step 2 Turn off the power going to all actuators that the battery change procedure is going to be performed on Be aware of failsafe triggers for the rest of the loop 3 Remove the six hexagon socket cap nuts holding the interface to the actuator The nuts are marked by red circles in the illustration Remove...

Page 79: ... damage to it 7 Disconnect all cables between the actuator and the failsafe module Remove the failsafe module by sliding it out Slide the new module onto the studs and reconnect the cables 8 Hold the interface close to the actuator and reconnect the cables The two equal connectors are distinguished by the color on the cable sleeve The cable with the blue sleeve connects to the cable with the blue ...

Page 80: ...ure to not drop the interface or to let it hang by the cables 10 Fasten the interface with the six hexagon socket cap nuts by turning them clockwise Note the correct sequence for tightening the nuts See Appendix A Torque and Screw Recommendations on page 83 11 Turn on the power going to the actuators 12 Disable service mode from the actuator control system Make sure that the actuator state indicat...

Page 81: ... cable no mark H Hybrid cable Self lock option Self lock C No Self lock CAN Option Single CAN no mark R Dual CAN Redundance Functional option for CAN interface only CANOnly no mark A Legacy CAN product not in use B Failsafe battery D Dual Power 24 V Generation 5 Generation 2 5 Communication Interface 120 CAN 150 Analog Digital CAN Product Family 70 QT70 250 QT250 400 QT400 800 QT800 1000 QT1000 Ex...

Page 82: ... BOM 30003 QT Series Protective Cover for handwheel QT Series Protective Cover 900 000 Service kit with Configuration Cable Service kit QT series 900 001 Eltorque Configuration cable for QT series actuators Config Cable QT series 35036 QT Series Actuator label Label 60 x 80 mm Premium Extra For availability contact your sales representant ...

Page 83: ...mounting flange Requirements DIN 125A minimum 200HV A4 Lubricate washer surface and underside of the bolt head with a lubricant resulting in a friction coefficient of 0 08 to 0 14 between bolt head and washer The lubricant must not contain aluminum zinc or copper To prevent galling when using stainless steel fasteners a lubricant containing MoS2 is recommended Use thread lock Loctite 222 or simila...

Page 84: ...inless steel fasteners a lubricant containing MoS2 is recommended Stainless steel fasteners tend to gall while being tightened The risk of galling or thread seizing can be reduced by Using recommended lubrication Tighten the screws in the sequence indicated in the figure below Tighten fasteners with low rpms without interruptions Apply only light pressure Figure 50 Tightening sequence for M4 screw...

Page 85: ... to the housing but go directly The PCB shall be earthed to the actuator housing from its own cable Outer braided screen shall be connected to PE earth at both ends Heat Shrink Tubing shall be used on visible wires inside the actuator Inner Screen shall be connected to IE IS earth in the control cabinet The other end shall be floating in the actuator electrically connected through all actuators in...

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