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Procedure, Field Replacement, Level Cage Kit, Base Exit 

 

Page

 

4

 

of

 

9

 

 

Document No 

135266 Rev B

 

Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea 
Tel, Inc..  This document may not be reproduced or distributed in any form without prior written 

consent of Sea Tel, Inc.  

 

 

10.

 

Diagnostics:

 

Any

 

incorrect

 

readings

 

from

 

the

 

above

 

tests

 

would

 

relate

 

to

 

an

 

error

 

in

 

the

 

antennas

 

control

 

loop

 

causing

 

the

 

system

 

to

 

not

 

stabilize

 

correctly.

 

The

 

most

 

likely

 

cause

 

of

 

this

 

is

 

a

 

defective

 

sensor

 

in

 

the

 

level

 

cage.

 

The

 

next

 

step

 

will

 

be

 

to

 

replace

 

the

 

level

 

cage

 

and

 

repeat

 

the

 

test

 

which

 

the

 

antenna

 

failed

 

to

 

verify

 

if

 

the

 

system

 

is

 

now

 

functioning

 

correctly.

   

Should

 

the

 

problem

 

persist

 

other

 

possibilities

 

are

 

a

 

bad

 

connection

 

on

 

the

 

reference

 

harness

 

between

 

the

 

level

 

cage

 

and

 

PCU

 

corrupting

 

the

 

feedback,

 

or

 

possibly

 

the

 

PCU

 

itself

 

not

 

calculating

 

the

 

feedback

 

correctly.

 

However

 

as

 

the

 

level

 

cage

 

is

 

the

 

most

 

likely

 

component

 

to

 

be

 

causing

 

this

 

issue

 

replacing

 

it

 

is

 

the

 

first

 

step

 

in

 

the

 

troubleshooting

 

procedure.

  

Once

 

the

 

problem

 

has

 

been

 

rectified

 

its

 

good

 

practice

 

to

 

refit

 

the

 

original

 

level

 

cage

 

and

 

see

 

if

 

the

 

fault

 

returns.

 

It’s

 

possible

 

that

 

there

 

was

 

corrosion

 

on

 

the

 

pins

 

of

 

the

 

reference

 

harness

 

and

 

by

 

connecting

 

the

 

replacement

 

level

 

cage

 

the

 

pins

 

have

 

been

 

cleaned,

 

allowing

 

good

 

metal

 

to

 

metal

 

contact

 

and

 

giving

 

the

 

impression

 

that

 

replacing

 

the

 

level

 

cage

 

rectified

 

the

 

fault

 

(cleaning

 

the

 

pins

 

on

 

the

 

PCU

 

end

 

of

 

the

 

reference

 

harness

 

is

 

also

 

advisable).

            

11.

 

Further

 

Information:

   

Should

 

the

 

system

 

fail

 

to

 

target

 

the

 

correct

 

elevation

 

(physically

 

pointing

 

at

 

a

 

different

 

position

 

to

 

the

 

reading

 

on

 

the

 

DAC)

 

or

 

have

 

issues

 

driving

 

past

 

a

 

certain

 

elevation

 

position

 

then

 

the

 

most

 

likely

 

cause

 

is

 

a

 

defective

 

level

 

cage

 

motor.

 

If

 

the

 

system

 

is

 

displaying

 

a

 

pedestal

 

error

 

(error

 

8)

 

then

 

there

 

is

 

a

 

drive

 

issue

 

with

 

the

 

antenna

 

and

 

attention

 

will

 

need

 

to

 

be

 

paid

 

to

 

the

 

motor

 

and

 

motor

 

driver

 

(servo

 

amp)

 

for

 

the

 

relevant

 

axis.

 

A

 

defective

 

level

 

cage

 

won’t

 

flag

 

an

 

error

 

8

 

as

 

the

 

PCU

 

doesn’t

 

know

 

if

 

the

 

feedback

 

from

 

the

 

level

 

cage

 

is

 

corrupt

 

which

 

is

 

why

 

the

 

antenna

 

will

 

mispoint

 

if

 

the

 

level

 

cage

 

is

 

defective.

    

Another

 

potential

 

issue

 

which

 

could

 

cause

 

the

 

antenna

 

to

 

lose

 

the

 

satellite

 

is

 

if

 

the

 

vessels

 

gyro

 

compass

 

is

 

drifting,

 

accumulating

 

error

 

which

 

is

 

then

 

fed

 

into

 

the

 

control

 

loop.

 

This

 

can

 

be

 

verified

 

by

 

running

 

a

 

DacRemP

 

log

 

file

 

at

 

sea

 

to

 

monitor

 

the

 

pedestals

 

readings

 

when

 

the

 

AGC

 

drops,

 

or

 

by

 

putting

 

the

 

system

 

into

 

satellite

 

reference

 

mode

 

to

 

bypass

 

the

 

gyro

 

from

 

the

 

azimuth

 

control

 

loop.

     

12.

 

2406

 

Level

 

Cage

 

Configuration:

   

To

 

use

 

the

 

level

 

cage

 

(part

 

number:

 

122937

1)

 

on

 

the

 

2406

 

pedestal,

 

it

 

will

 

need

 

to

 

be

 

converted

 

into

 

a

 

122937

2.

 

This

 

is

 

done

 

simply

 

by

 

re

 

configuring

 

the

 

end

 

stops

 

on

 

the

 

back

 

of

 

the

 

level

 

cage

 

assembly

 

as

 

per

 

the

 

below

 

image.

 

The

 

standard

 

122937

1

 

level

 

cages

 

has

 

the

 

end

 

stops

 

on

 

the

 

left

hand

 

side,

 

these

 

will

 

need

 

to

 

be

 

moved

 

to

 

the

 

right

hand

 

side

 

to

 

use

 

the

 

level

 

cages

 

on

 

the

 

2406

 

pedestal.

   

 

122937

1

                                            

122937

2

 

 

Summary of Contents for Base Exit

Page 1: ......

Page 2: ...ystems remote tilt setting 4 Verify RemoteTilt If the pedestal is having stability problems firstly check the remote tilt setting by looking at the level bubble on top of the level cage note older systems didn t have a bubble installed on top of the level cage If the bubble isn t as close to central as possible the remote tilt setting isn t correctly calibrated meaning the rate sensors won t be co...

Page 3: ...acRemP trace returns or the systems axis returns back to its original position instantly without deviating or taking time to settle Now push the cross level beam down to the right and hold it in position Verify that the CL trace on DacRemP moves up an equal amount to the movement exerted on the axis Release the Axis and verify the DacRemP trace returns or the systems axis returns back to its origi...

Page 4: ...ed by the PCU A mechanical problem such as the belt skipping on the sprocket or another physical restriction could also cause this kind of error Skewing the antenna in azimuth by holding the right or left arrow key to drive the antenna slowly may also present an issue If the system keeps finding the satellite at different azimuth positions but at the same relative then the encoder is functioning c...

Page 5: ...l cage rectified the fault cleaning the pins on the PCU end of the reference harness is also advisable 11 Further Information Should the system fail to target the correct elevation physically pointing at a different position to the reading on the DAC or have issues driving past a certain elevation position then the most likely cause is a defective level cage motor If the system is displaying a ped...

Page 6: ... to side on the spindle not over tightened so it can move smoothly 14 Replacing the Level Cage Assembly 14 1 Tools 2mm Flat Blade Terminal Screw Driver 1 Phillips Screwdriver Wrench Spanner 14 2 Procedure Procedure for replacing the level cage assembly Sea Tel kit part number 135343 level cage assembly part number 122937 1 and tensioning the level cage belt The principal is the same for the XX06 l...

Page 7: ...he belt from level cage motor sprocket 4 Using a socket or wrench remove the Nylock nut securing the level cage to the spindle 5 Take care not to remove the level standoff spacer from the spindle 6 Install the replacement level cage onto the spindle slipping the belt over the level cage pulley and making sure its end stops are aligned correctly Secure it with the 1 2 Nylock nut tightened so it sli...

Page 8: ... of Sea Tel Inc 9 Tension the belt by sliding the motor assembly by hand away from level cage and tighten one of the four screws 10 Increase the belt tension until the belt can only be easily twisted just turn with your fingers 11 If the belt tension is too tight lose adjust until correct and then secure the motor 12 Plug the reference harness back into the level cage D Sub connector and tighten t...

Page 9: ...e window and then press the arrow followed by the button to turn dishscan from on to off Note When you press the arrow to turn dishscan off you won t see the display change until you press the button Steps 2 7 requires assistance to observe and operate antenna simultaneously 2 Enter into the Setup Menu by pressing and holding the arrows together until the EL Trim or Auto Trim parameter is displaye...

Page 10: ...row key to scroll through the menu until the dishscan window is displayed Press the arrow key to activate the window and then press the arrow key followed by the button to turn dishscan from off to on Note When you press the arrow to turn dishscan on you won t see the display change until you press the button 8 Save the Remote Tilt setting in the PCU Press the arrow key until the Remote Parameters...

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