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Sea Tel 4012 Quick Start Manual Download Page 14

Field Service Procedure – Replacement Pol Pot Kit, 4012 

 

Page

 

13

 

of

 

16

 

 

Document No 

136829 Rev A

 

Copyright © Sea Tel, Inc 2012 - 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.  

 

 

28.

 

Use

 

a

 

screwdriver

 

to

 

hold

 

the

 

bottom

 

half

 

of

 

the

 

backlash

 

gear

 

(pot

 

shaft)

 

steady

 

while

 

rotating

 

the

 

top

 

half

 

CW

 

one

 

tooth

 

(against

 

the

 

spring

 

action)and

 

push

 

the

 

pot

 

assmebly

 

forward

 

to

 

mate

 

into

 

the

 

driven

 

gear

 

in

 

the

 

feed.

   

29.

 

Hold

 

tension

 

against

 

the

 

pot

 

bracket,

 

and

 

while

 

assuring

 

that

 

the

 

pot

 

resistance

 

reading

 

is

 

still

 

3050

 

+/

‐ 

50

 

ohms,

 

tighten

 

the

 

mounting

 

screws.

   

30.

 

If

 

the

 

pot

 

resistance

 

is

 

not

 

3050

 

+/

‐ 

50

 

ohms,

 

repeat

 

steps

 

23

‐

29

 

until

 

the

 

proper

 

reading

 

is

 

achieved

 

at

 

exact

 

feed

 

alignment.

   

31.

 

Remove

 

the

 

tape

 

from

 

the

 

feed

 

and

 

verify

 

alignment

 

and

 

resistance

 

when

 

exactly

 

aligned.

  

If

 

correct,

 

this

 

completes

 

calibration

 

of

 

the

 

assembly.

   

 

 

32.

 

Route

 

the

 

pot

 

wires

 

throught

 

the

 

RF

 

cage

 

where

 

they

 

will

 

not

 

be

 

pinched

 

when

 

re

‐

installing

 

the

 

side

 

bracket

 

and

 

install

 

the

 

harnesses

 

back

 

into

 

the

 

wrap

 

removed

 

is

 

step

 

18.

 

 

 

 

33.

 

Flip

 

the

 

RF

 

cage

 

over

 

to

 

expose

 

the

 

pol

 

motor

 

backlash

 

gear.

    

34.

 

Use

 

a

 

small

 

flat

 

blade

 

screwdriver

 

to

 

hold

 

the

 

bottom

 

half

 

of

 

the

 

backlash

 

gear

 

steady

 

while

 

rotating

 

the

 

top

 

half

 

CW

 

one

 

tooth

 

(against

 

the

 

spring

 

action)and

 

push

 

the

 

motor

 

assemebly

 

forward

 

to

 

mate

 

into

 

the

 

driven

 

gear

 

in

 

the

 

feed.

   

35.

 

Once

 

engaged

 

tighten

 

the

 

screws

 

securing

 

the

 

pol

 

motor

 

to

 

the

 

bottom

 

plate

 

of

 

the

 

RF

 

cage

 

using

 

a

 

3mm

 

Allen

 

wrench.

 

Apply

 

Loctite

 

242

 

to

 

the

 

threads.

  

*Note:

 

Precise

 

alignment

 

of

 

the

 

feed

 

is

 

not

 

required

 

when

 

re

‐

coupling

 

the

 

motor.

   

 

 

36.

 

Install

 

the

 

Co

‐

Pol

 

LNB

 

and

 

bracket

 

assembly

 

to

 

the

 

RF

 

cage

 

using

 

a

 

the

 

5

 

screws

 

removed

 

in

 

step

 

15

 

and

 

a

 

4mm

 

Allen

 

wrench.

 

Apply

 

Loctite

 

242

 

to

 

the

 

threads,

 

do

 

not

 

fullt

 

tighten

 

at

 

this

 

time.

   

*Note:

  

Ensure

 

the

 

waveguide

 

bracket

 

is

 

installed

 

on

 

the

 

outside

 

of

 

the

 

flange

 

so

 

the

 

5

 

mounting

 

points

 

align

 

correctly.

 

 

Summary of Contents for 4012

Page 1: ......

Page 2: ...nto the numerical value to align the feed in the required position based on the vessels GPS location and the look angle to the required satellite A failure with the pot will cause it to output an incorrect voltage will result in the feed assembly not being aligned correctly causing bad cross pol isolation One indication that there is a fault with the feed alignment of the system is that the target...

Page 3: ...hroughout its range This will also verify if the pol motor is driving correctly Log into the MXP and from the configuration menu select the Reflector page from the configuration section and verify the polang drive option is set to Automatic Now select the Position Antenna screen from the tools window and configure the satellite settings as follows Longitude Enter the longitudinal value of your cur...

Page 4: ...s issued the function of the 24VDC polang motor should be verified as per section 7 of this document 5 Verify the Feed Assemblies Range of Motion To verify if the 4012 antennas polarity function is calibrated correctly refer to section 3 of this document Once verified that the pot is calibrated the next step will be to verify that the system has the full range of motion 135 degrees of physical rot...

Page 5: ...shown above 3 Now enter into the value 00 0 into the linear window of the polang target option and press the enter key on the keyboard The feed horn should rotate 45 0 degrees counter clockwise when viewed from the front of the reflector so that the alignment marks of the phase card in the feed horn are aligned diagonally in a north east position as shown above 4 Now enter into the value 90 0 into...

Page 6: ...se card in the feed horn are aligned diagonally in a north west position as shown above 6 If the system completes all of the above tests than the polang assembly is operating correctly Set the antenna back into automatic polang mode by entering into the Reflector screen under the configuration options and set the polang drive mode to Automatic and click the save button The antenna will now automat...

Page 7: ...op Now measure the resistance between the slider and the CCW contact grey cable pin 2 on the IDC connector and the red cable pin 3 on the IDC connector The feedback should be approximately 5k ohms Now slowly rotate the shaft of the pot counter clockwise the reading should count down sequentially After one and a half turns the pot will be in the center of its range giving a resistance of approximat...

Page 8: ...replacing If no voltage is present verify the connections of the reflector harness by measuring pin to pin as per the below diagram If the harness connections are good then the ICU main PCB isn t outputting the voltage to drive the motor and needs replacing As long as the pol range is within the pot limits the ICU will issue the voltage to drive the motor based on the antenna targeting a change in...

Page 9: ...242 8 2 Procedure Procedure for replacing the pol pot Sea Tel kit part number 136741 pol pot part number 115425 6 Caution Power down the pedestal before following this procedure 1 Using a 2 5mm Allen wrench remove the four screws securing the feed horn to the front of the reflector and remove the feed horn Save the hardware for futures use 2 Disconnect the military spec connector from its socket t...

Page 10: ...any form without prior written consent of Sea Tel Inc 4 Snip the cable tie securing the RF cage harness to the mounting plate 5 Disconnect the pol pot pol motor and optical switch IDC connections from the termination block on the 6 Disconnect the orange coax cable from the X Pol LNB 7 Disconnect the yellow coax cable from the Co Pol LNB mounted on the underside of the RF cage 8 Snip the cable tie ...

Page 11: ...de of the RF cage 10 Disconnect the TX IF coax cable from the BUC 11 Unwind the harness from around the RF cage and set it over the cross level beam to allow removal of the RF cage from the rear of the reflector 12 Using a 17mm wrench remove the four mounting nuts and washers securing the RF cage from the back of the reflector Save the hardware for future use 13 Support the weight of the RF cage w...

Page 12: ... 4mm Allen wrench remove the 5 screws securing the bracket to the RF cage Save the hardware for future use Note The four 3mm screws do not need to be removed to gain access to the pol pot 16 Remove the bracket along with the Co Pol LNB as a complete assembly to allow access to the pol pot assembly 17 Using a 3mm Allen wrench loosed the pol motor screws enough to allow the backlash gear to be disen...

Page 13: ...e feed motor pot gears 23 Connect your multi meter and measure the resistance across the red and grey wire connections in the IDC connector Using needle point probes or wires inserted into the IDC connector pins 24 Set the multi meter to Ohms Resistance function 25 The picture to the right is the view looking down on the assembly You will rotate the feed throat by hand as needed to align the 2 ali...

Page 14: ... aligned If correct this completes calibration of the assembly 32 Route the pot wires throught the RF cage where they will not be pinched when re installing the side bracket and install the harnesses back into the wrap removed is step 18 33 Flip the RF cage over to expose the pol motor backlash gear 34 Use a small flat blade screwdriver to hold the bottom half of the backlash gear steady while rot...

Page 15: ...stalling the RF cage ensure that it is oriented correctly so that the alignment pin on the left side of the reflector will locate into the hole on the back of the RF cage In this orientation the X Pol LNB will be on the right of the RF cage 39 Using the hardware removed in step 12 secure the RF cage to the rear of the reflector using a 17mm wrench Apply Loctite 242 to the threads 40 Route the harn...

Page 16: ...nd connect it to the BUC 46 Sit the upper bracket on top of the RF cage and reconnect the IDC connectors with the 4 pin sensor connector on the left the 5 pin pot connector in the center and the 2 pin motor connector on the right as shown in the image on the right 47 Secure the pot motor and sensor harness to the underside of the upper bracket using a cable tie 48 Using the hardware removed in ste...

Page 17: ...e 242 to the threads Note The feed horn has alignment pins located in it to so it can only be installed with the phase card in the correct orientation Verify these are in the correct position when installing 51 Access the configuration reflector page to adjust the linear offset value by the amount of change in skew Example The amount of change in skew was 2 degrees so you need to add that amount t...

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