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OM-7986

Page 9 of 23

Issue A - Rev 8

Fig.5 - LRT with the rope canister attached and flotation buoys,

surface command unit and remote transducer

2.6

Safe Working Loads

The Type 7986 LRT has a Safe Working Load (SWL) of 125kg. This is defined as the
maximum recommended working load. This is set as a quarter (1/4) of the Breaking Load
and allows for factors such as corrosion, fatigue, shock loads, harmonic loads, manufacturing
and material variations.

S.W.L = 125Kg

Release Load

The LRT has a maximum release load of 125kg. This is the maximum in-line load that the
whole assembly can release whilst guaranteeing safe and reliable operation. Note that as
the load is released in water, this is normally determined by the maximum up-thrust from
buoyancy.

WARNING

– the maximum release load of 125kg only applies if the shaft and nut are coated

with underwater grease and the correct battery pack is used, see below.

RELEASE LOADS (Kg)

vs Battery Type & Life

START

Nut

Greased

START

Nut NOT

Greased

END

Nut

Greased

END

Nut NOT

Greased

Alkaline 10 Cell (641-2414)

125

100

125

50

Lithium 2 x 4 Cell (640-8515)

125

100

125

50

Lithium TX & RX (640-8864)

125

100

125

50

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Содержание 7986

Страница 1: ...e 7986 Lightweight Release Transponder LRT Head Office Sonardyne International Limited Blackbushe Business Park Yateley Hampshire GU46 6GD United Kingdom T 44 0 1252 872288 F 44 0 1252 876100 E support sonardyne com www sonardyne com ...

Страница 2: ... TRANSPONDER ISSUE A REVISION 8 Prepared by D J Baker Authorised by N D Street Date 21st November 2010 S O N A R D Y N E I N T E R N A T I O N A L L I M I T E D Blackbushe Business Park Yateley Hampshire GU46 6GD United Kingdom Tel 0 1252 872288 Fax 0 1252 876100 Email support sonardyne com ...

Страница 3: ...Using the Rope Canister 3 MAINTENANCE 3 1 Battery Pack Replacement 3 2 Replacing the PCB Release Endcap and Transducer 3 3 General Maintenance 4 SPECIFICATIONS 4 1 LRT Specifications 4 2 Rope Canister Specifications 4 3 Large Rope Canister Specifications 5 DRAWINGS 5 1 LRT Outline Drawing 5 2 Release Nut Manufacturing Drawing 5 3 Rope Canister Outline Drawing 5 4 Large Rope Canister Outline Drawin...

Страница 4: ...1 07 03 CPN number for Release Mechanism Endcap in Spares List was 641 050 and has been amended to 641 1050 All All A 3 11 04 06 Update to include rope canister variants All All CN 8951 A 4 19 05 06 Additional parameters for 4 1 17 Max Listening Life CN 9006 A 5 21 02 07 Amendment to stock code for shackle in All All Section 6 CN 9306 A 6 24 09 08 Add Tilt indication version 7986 000 06 1 2 4 7 10...

Страница 5: ... from the vessel to the transponder This enables the operator to confirm the transponder is operational and within range If the unit has been dragged from its original location it also enables the transponder to be relocated To release the transponder the operator must send 3 unique and secure messages to the transponder Upon receipt the transponder replies and activates the motor to turn the rele...

Страница 6: ...own below and press the PROGRAM button The surface unit will program and then test the transponder it will display PASS and beep once to confirm successful programming FAIL will be display and no beep will be heard if unsuccessful An additional test can be carried out by pressing the TEST button NOTE if the LRT has the Tilt feature fitted every other Program operation will give a FAIL reply if the...

Страница 7: ...assumes the transponder is only rarely interrogated or released 2 4 Loading The Release Mechanism NOTE Grease the stainless steel shaft of the release mechanism and the release nut thread with underwater grease prior to loading the mechanism Although the glass re enforced plastic is already impregnated with lubricant this significantly reduces the friction This in turn reduces the starting torque ...

Страница 8: ...always recommended that the remote transducer is used to test the operation of the LRT in water WARNING Before deployment in water ensure that the red pressure relief valve in the release mechanism endcap is pushed home note it is also sprung loaded Load the release nut and attach the LRT and nut by a short line and deploy in greater than 1 metre depth of water a bucket can be used if necessary De...

Страница 9: ...the surface unit will display FAIL If the final rEL command results in a FAIL the timer will still run but will display It is permissible in this circumstance to again press and hold down the PROGRAM and BATTERY LOAD buttons to repeat the Set rEL sequence NOTE Due to acoustic ambient noise at the surface typically generated by the vessel the reply signal from the LRT to the surface is more difficu...

Страница 10: ... The LRT has a maximum release load of 125kg This is the maximum in line load that the whole assembly can release whilst guaranteeing safe and reliable operation Note that as the load is released in water this is normally determined by the maximum up thrust from buoyancy WARNING the maximum release load of 125kg only applies if the shaft and nut are coated with underwater grease and the correct ba...

Страница 11: ... as possible Select the correct acoustic identity on the surface unit Press the TEST RANGE button The range in meters to LRT will be displayed and a beep will be heard if a valid reply is received NOTE if the LRT has the Tilt feature fitted only every other interrogation will give a Range reply if the unit is tilted beyond 30 degrees The maximum slant range from which the transponder can be ranged...

Страница 12: ...nd period plus the time required to rise to surface in the particular water depth After donE is displayed on the surface unit you can repeatedly range to the transponder to determine its position Decreasing range will indicate that the LRT and mooring is rising to the surface A fixed range may indicate that for some reason the unit has not released properly this could be due a number of factors eg...

Страница 13: ...re the correct orientation of the nut Pass the rope through the centre of the assembly and attach onto the shackle as shown Re attach the assembly onto the nut replacing the pin and clip Fig 6 LRT with the rope canister attached Fig 7 Retaining pin connects nut to the canister assembly Rope is attached to the shackle Fig 8 LRT released rope about to be deployed from canister ...

Страница 14: ... 8 4kg rated to 350m are provided as part of the assembly In high bio foul areas and or for long deployment it may be advisable to add additional buoyancy to ensure that if the rope is fouled more force is applied to break the rope out of the canister Due to wear on the release nut it is advisable that the nut is replaced at least every 5th deployment Refer to Section 6 2 for dimensions and load r...

Страница 15: ...ure Housing 2 x Retaining Bars and 3 8 inch OD Shackle Now remove the transducer endcap by carefully rotating and pulling It is not necessary to disconnect the transducer wire Disconnect the battery pack 3 way connector as shown in the picture below and pull out the battery pack Insert the new battery pack and using a pair of needle nosed pliers reconnect the 3 way connector to the socket marked B...

Страница 16: ...ry packs are required by law to be disposed of correctly 3 2 Replacing the PCB Transducer and Release Mechanism Remove the inner housing assembly transducer endcap and battery pack as detailed in section 3 1 above Now carefully rotate backwards forwards and pull the release mechanism endcap to remove Disconnect the 4 way molex connector pull carefully pulling on the wires Now push the PCB out of t...

Страница 17: ...coustics failure of the transducer Any leakage of water can also possibly enter the inner pressure housing through the transducer Ensure that the transducer within the outer housing is free from mud stones and importantly grease These can all significantly degrade the acoustic performance If the transducer is contaminated with grease clean and wash with a mild detergent Always wash down the unit w...

Страница 18: ... 2 second update rate for 2 hours per day 125 days 4 second update rate for 2 hours per day 213 days 4 second update rate for 8 hours per day 71 days Max number of releases 850 10 life left Standard Lithium Pack 39 months listening Max number of transmissions 1 000 000 2 second update rate for 2 hours per day 235 days 4 second update rate for 2 hours per day 398 days 4 second update rate for 8 hou...

Страница 19: ...0 75 Kg Construction Materials Plastics 316 Stainless steel Rope Length 75 m Rope diameter 4 5 mm SWL 100 kg 4 3 Large Rope Canister Specifications with combined LRT assembly Size Overall Length Canister Length Canister Diameter Max Width 531mm 398mm 110mm 183mm Weight in Air 4 0 kg Weight in Water 0 8 Kg Construction Materials Plastics 316 Stainless steel Rope Length Options Length m Rope dia mm ...

Страница 20: ...OM 7986 Page 19 of 23 Issue A Rev 8 5 DRAWINGS 5 1 LRT Outline Drawing 5 2 Release Nut Manufacturing Drawing ...

Страница 21: ...OM 7986 Page 20 of 23 Issue A Rev 8 5 3 Standard Rope Canister Outline Drawing 75m 5 4 Large Rope Canister Outline Drawing 120 160m ...

Страница 22: ... PCB 7986 035 01 631 7605 PCB with tilt indication 7986 035 06 631 7751 Inner Housing 7986 023 710 2247 Outer Housing 7986 024 710 2234 SS Retaining Bars Release Mechanism End 7986 034 815 1157 SS Retaining Bar Transducer End 7986 033 815 1138 6 2 Rope Canister Description Type No CPN Rope Canister with 75m rope 100kg 7986 008 01 641 1122 Large Rope Canister with 120m rope 250kg 7986 008 02 641 32...

Страница 23: ...0 5 12 006 1 57 011 5 13 007 1 58 012 5 14 008 1 59 013 5 15 009 1 60 004 6 16 010 1 61 005 6 17 011 1 62 006 6 18 012 1 63 007 6 19 013 1 64 008 6 20 004 2 65 009 6 21 005 2 66 010 6 22 006 2 67 011 6 23 007 2 68 012 6 24 008 2 69 013 6 25 009 2 70 004 7 26 010 2 71 005 7 27 011 2 72 006 7 28 012 2 73 007 7 29 013 2 74 008 7 30 004 3 75 009 7 31 005 3 76 010 7 32 006 3 77 011 7 33 007 3 78 012 7 ...

Страница 24: ...OM 7986 Page 23 of 23 Issue A Rev 8 Coastal RovTrak Prospector systems Address Frequency Conversion Table Rov Trak Prospector IDs Address Reply Frequency Code A 004 1 B 005 3 C 006 5 D 007 7 ...

Страница 25: ......

Страница 26: ...Head Office Sonardyne International Limited Blackbushe Business Park Yateley Hampshire GU46 6GD United Kingdom T 44 0 1252 872288 F 44 0 1252 876100 E support sonardyne com www sonardyne com ...

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