Sea Tel Side Exit Quick Start Manual Download Page 5

Procedure, Field Replacement, Level Cage Kit, Side Exit 

 

Page

 

4

 

of

 

8

 

 

Document No 

135265 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

 

would

 

be

 

to

 

replace

 

and

 

re

calibrate

 

the

 

level

 

cage.

 

Now

 

repeat

 

the

 

failed

 

test

 

to

 

verify

 

that

 

the

 

system

 

is

 

now

 

functioning

 

correctly.

   

Should

 

the

 

problem

 

remain,

 

another

 

possible

 

cause

 

may

 

be

 

a

 

fault

 

with

 

the

 

reference

 

harness

 

between

 

the

 

level

 

cage

 

and

 

PCU.

 

The

 

PCU

 

itself

 

should

 

not

 

be

 

ruled

 

out

 

as

 

faulty

 

either.

 

Even

 

so,

 

the

 

level

 

cage

 

is

 

the

 

most

 

likely

 

component

 

to

 

be

 

causing

 

this

 

issue,

 

therefore

 

replacing

 

it

 

is

 

the

 

first

 

step

 

when

 

troubleshooting.

 

Once

 

the

 

problem

 

has

 

been

 

rectified,

 

it

 

is

 

good

 

practice

 

to

 

refit

 

the

 

original

 

level

 

cage

 

and

 

see

 

if

 

the

 

fault

 

returns.

 

It

 

is

 

possible

 

that

 

corrosion

 

on

 

the

 

pins

 

of

 

the

 

reference

 

harness

 

and/or

 

connectors

 

of

 

the

 

PCU/level

 

cage

 

caused

 

the

 

initial

 

fault.

 

By

 

connecting

 

the

 

replacement

 

level

 

cage,

 

it

 

is

 

likely

 

that

 

any

 

pin

 

corrosion

 

may

 

have

 

rubbed

 

off,

 

creating

 

a

 

cleaner

 

electrical

 

contact.

 

You

 

may

 

have

 

been

 

under

 

the

 

impression

 

that

 

replacing

 

the

 

level

 

cage

 

rectified

 

the

 

fault

 

when

 

in

 

actual

 

fact;

 

the

 

issue

 

was

 

a

 

poor

 

electrical

 

contact

 

causing

 

varying

 

resistance.

        

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),

 

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.

 

There

 

is

 

no

 

error

 

code

 

that

 

directly

 

tells

 

you

 

if

 

the

 

level

 

cage

 

or

 

level

 

cage

 

stepper

 

motor

 

has

 

failed,

 

however,

 

a

 

pointing

 

or

 

stabilization

 

issue

 

is

 

a

 

good

 

indication.

    

Another

 

potential

 

issue

 

which

 

could

 

cause

 

the

 

antenna

 

to

 

lose

 

the

 

satellite

 

is

 

if

 

the

 

vessels

 

gyro

 

compass

 

is

 

drifting.

 

This

 

accumulating

 

error

 

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

 

uncouple

 

the

 

gyro

 

feed

 

from

 

the

 

azimuth

 

stabilization

 

loop.

      

 

 

Summary of Contents for Side Exit

Page 1: ......

Page 2: ...level bubble on top of the level cage note older systems didn t have a bubble installed on top of the level cage It is only possible to do so when the vessel is stationary 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 correctly aligned with their axis This will cause the rate sensors to output incorrect feed...

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

Page 4: ...s the belt slipping on the pulley could also cause this kind of error as could some other mechanical issue 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 the encoder is functioning correctly and one of the reference inputs Le...

Page 5: ...ectors of the PCU level cage caused the initial fault By connecting the replacement level cage it is likely that any pin corrosion may have rubbed off creating a cleaner electrical contact You may have been under the impression that replacing the level cage rectified the fault when in actual fact the issue was a poor electrical contact causing varying resistance 11 Further Information Should the s...

Page 6: ...llips Screwdriver Wrench Spanner 12 2 Procedure Procedure for replacing the level cage assembly Sea Tel kit part number 135344 level cage assembly part number 122208 1 and tensioning the level cage belt CAUTION Power down the pedestal before following this procedure 1 Using a 2mm flat blade screwdriver loosen the screws securing the reference harness D Sub connector to level cage 2 Using a 1 Phill...

Page 7: ...correctly 7 Secure it with the 1 2 Nylock nut When tight so that there is no horizontal play along the spindle add an additional a turn for a good ground Rotate the level cage by hand and verify it has 90 degrees of motion and that the cage rotates freely ensuring the stops do not rub against the EL pan 8 Tension the belt by sliding the motor assembly by hand away from level cage and then tighten ...

Page 8: ...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 9: ...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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