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Guralp Systems 3T Emergency Mass-Locking, Technical Procedure

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Guralp Systems 3T Emergency Mass-Locking Technical Procedure Download Page 12

3T Emergency Mass-Locking

Emergency Locking

3.3  Electrically driving the mass-lock motors

If it is impossible to lock the masses because of failure of the associated electronics, 
the mass lock motors can be driven directly in order to lock the masses.  In normal 
use, the motors are electrically isolated by relays, so it is perfectly safe to connect a 
power supply to the motors without first having to disconnect them from the 
electronics.  The picture below identifies the key parts on the horizontal sensors:

PRC-030-0002

12

Issue B - January, 2017

Summary of Contents for 3T Emergency Mass-Locking

Page 1: ...3T Emergency Mass Locking Technical Procedure Document No PRC 030 0002 Issue B January 2017 Designed and manufactured by Güralp Systems Limited 3 Midas House Calleva Park Aldermaston RG7 8EA England ...

Page 2: ...autions and Notes 3 1 3 Manuals and Software 3 1 4 Conventions 3 2 Introduction 5 3 Emergency Locking 6 3 1 Equipment Required 6 3 2 Sensor disassembly 6 3 3 Electrically driving the mass lock motors 12 3 4 Manually driving the mass locks 13 3 5 Reassembly 18 4 Revision history 19 PRC 030 0002 Issue B January 2017 ...

Page 3: ...utions and notes are displayed and defined as follows Warning A black cross indicates a chance of injury or death if the warning is not heeded Caution A yellow triangle indicates a chance of damage to or failure of the equipment if the caution is not heeded Note A blue circle indicates indicates a procedural or advisory note 1 3 Manuals and Software All manuals and software referred to in this doc...

Page 4: ...otes Where data that you type may vary depending on your individual configuration such as parameters to commands these data are additionally shown in italics Example of the fixed width bold italic typeface PRC 030 0002 4 Issue B January 2017 ...

Page 5: ... frame while the instrument is being moved reducing the risk of damage to the pivots The mass locking mechanisms for horizontal and vertical component sensors differ but both use a motor and gearbox to drive a cam which acts on a sprung bar One end of the bar attaches to the frame and the other end has a pin attached which protrudes through the cap plate the metal plate parallel to and immediately...

Page 6: ...de components which can be damaged by electrostatic discharge Always work on a properly grounded dissipative surface and wear a suitable grounded wristband Ground yourself by touching an earthed conductor before handling any of the circuit boards To gain access to the sensor components it is first necessary to remove the lid of the instrument along with any associated electronics and the outer sle...

Page 7: ... contact Güralp technical support for advice 1 Locate the North indicator on the base of the instrument This may be a stamped N or a gold coloured stud If no such indication can be found use a permanent marker to mark the position of the cylinder with respect to both the base and the lid 2 Using the 2mm hexagonal driver remove the screws around the top edge of the cylinder PRC 030 0002 7 Issue B J...

Page 8: ...e of the instrument and local atmospheric pressure Ensure that the pressure relief screw does not fly off when released Failure to do so may cause injury 4 Remove the lid from the instrument It will initially be difficult to remove because of the O rings Caution The force required will drop significantly when the O ring seals become clear of the the top of the cylinder Take particular care that th...

Page 9: ...hard to move a flat headed screw driver can be inserted into the small slot formed by a cut out in the top of the cylinder and used for leverage 5 Lift the lid away from the cylinder and wearing an anti static wrist band disconnect at either end the ribbon cable connecting it to the lower electronics 6 Using the 2mm hexagonal driver remove the screws around the bottom edge of the cylinder and gent...

Page 10: ...gements so what you see at this stage may differ from the illustrations Use common sense and proceed with care If you are in any doubt please consult Güralp Systems technical support for advice It may be helpful for you to take photographs as you work both for avoiding any doubt during reassembly and to aid in reporting problems should you encounter any Photographs also help GSL support staff in i...

Page 11: ...ls The two horizontal sensors are usually hand marked during assembly as in the photo below if not the fine wires from the tops of the sensors can be traced to the feedback board where the PCB s silk screening will identify which is which If all else fails compare the axes of movement of the masses with the North indication on the base plate PRC 030 0002 11 Issue B January 2017 ...

Page 12: ...tronics the mass lock motors can be driven directly in order to lock the masses In normal use the motors are electrically isolated by relays so it is perfectly safe to connect a power supply to the motors without first having to disconnect them from the electronics The picture below identifies the key parts on the horizontal sensors PRC 030 0002 12 Issue B January 2017 ...

Page 13: ...ed This can be verified by gently attempting to move the mass If any motion is observed repeat with the polarity reversed to drive the motors in the opposite direction 3 4 Manually driving the mass locks If the motors or gearboxes have failed it may not be possible to electrically lock the masses In this case the mechanisms will have to be manipulated manually Access to the North South sensor comp...

Page 14: ...gearbox output shaft Do not apply pliers to the cam itself as you risk damaging the surface If the cam cannot be turned release the single motor clamp screw so that the motor and gearbox assembly can rotate as well Turn the cam until its crown faces the point of contact with the spring then remount the assembly The mass will be locked as the screws are tightened Once the East West sensor component...

Page 15: ...ires near the tilt base marked by arrows in the photo below Mark one or both wires so as to ensure correct reconnection then de solder them from the terminal posts 2 Similarly locate mark and de solder the four upper fine wires PRC 030 0002 15 Issue B January 2017 ...

Page 16: ...3T Emergency Mass Locking Emergency Locking 3 Disconnect the cables to the locking motor at the connector shown PRC 030 0002 16 Issue B January 2017 ...

Page 17: ...3T Emergency Mass Locking Emergency Locking 4 Undo the three screws arrowed in the following photographs holding the component sensor to the instrument base PRC 030 0002 17 Issue B January 2017 ...

Page 18: ...e cam in this way If the gears cannot be rotated it may be possible to release the grub screw on the driving gear the one on the gearbox output shaft and turn the cam without turning the gearbox and motor The grub screw should be re tightened afterwards If it still proves impossible to turn the cam the motor can be released from its clamp allowing it to turn in its mounting while the cam is being ...

Page 19: ...gency Mass Locking Revision history 4 Revision history 2010 04 28 A New document 2017 01 09 B Rebranded Added Preliminary Notes along with additional warnings and cautions PRC 030 0002 19 Issue B January 2017 ...

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