CWID Nozzle Aerial Replacement. Compac DCA

Service and Upgrade Procedures

CWID Nozzle Aerial Replacement

Tools Required to Replace the CWID

Nozzle Aerial

Removal

Replacement

CWID Nozzle Aerial Replacement

If the nozzle mounted CWID aerial or cable fails, the entire assembly must be replaced. The aerial can be ordered with a 5, 10, 12 or 14 metre cable to suit the application.

For most nozzle mounted CWID aerials the CWID aerial will terminate at a

CWID interface board mounted at the pump. The interface board is connected to the C4000 board in the unit by an extended cable.

 Spanners

 Side cutters

 Electrical screwdrivers

 Cable ties

1. Remove the aerial wire from the CWID board.

2. Undo the three bolts holding the CWID aerial ring onto the nozzle and remove.

3. Undo any cable fastenings or snip any cable ties to free the cable.

Installation is the opposite of removal. The installation of the CWID aerial cable varies from site to site. Install the new cable the same way as the original.

If either the aerial or the interface board are replaced the

aerial must be re-tuned. Refer to Tuning the Aerial (see page 106).

Compac Industries Ltd.

Page 105 www.compac.co.nz

CWID Nozzle Aerial Replacement

Tuning the CWID Aerial

Service and Upgrade Procedures

Whenever the CWID PCB is changed, the aerial will need to be tuned. For locations of the connectors, refer to the picture in CWID Interface Board

Replacement (see page 102).

1. Connect a Multimeter (set to Volts) to CON8.

2. Place a shorting link across pins 2 & 3 of CON4. The poll LED will flash slower, indicating "Tuning Mode"

3. Using the dipswitches (SW1), adjust the capacitance to obtain the maximum voltage at CON8. Each dipswitch adds a capacitor to the tuned circuit. The DIP switches 1 to 5 are primary capacitors while 6 to

8 are fine tuning capacitors.

4. Use the following technique:

5. Turn on Switch 1 and measure voltage, turn on switch 8 and see if voltage rises or falls. If it rises, turn off 8 and turn on switch 2.

6. Continue this procedure for switches 3,4 and 5 until you get a voltage drop.

7. If the voltage drop occurs at switch 2,3,4 or 5 then return to the previous switch and add switches 6,7 and 8 until the voltage drops.

When the drop occurs, revert to the previous switch.

8. If there is no voltage drop as switches 6, 7 and 8 are added, compare this voltage to the voltage achieved at the next primary switch with 6, 7 and 8 turned off.

9. If you can't get a voltage drop when the fine tuning switches are used, use the chart below to calculate a capacitance figure between the switch combination achieved above. For example:If 1+2+6+7+8 (7.3 nF) obtains a higher voltage than 1+2+3 (8.33nF) then try 1+2+5 (7.33 nF) if the voltage reading is higher than the two previous combinations, switch on 8 then 7 then 6 until you get a drop. If no drop is measured then try 1+2+4(7.66 nF). Keep working with combinations until you get the voltage drop when one of the fine tuning switches is added or you have run out of combinations. Always use the setting that achieves the highest voltage.

10. If the voltage drop occurs at step 5, turn off switch 1 and turn on switches 2,3,4 and 5 then test for voltage drop with switch 8. If voltage drops then turn off switch 5, measure voltage and test again with switch

8. Continue with combinations until a voltage drop occurs when one of the fine tuning capacitors is switched on.

11. Though the CWID aerial can work at lower voltages, the voltage reading should be above 28 Volts.

12. Remove the shorting link fitted at 2 above.

13. Test the operation with a valid CWID key.

Dipswitch

(SW1)

Capacitance

(nF)

Dipswitch

(SW1)

1 4.7 5

2 2.3 6

Capacitance

(nF)

0.33

0.1

3 1.33 7 0.1

4 0.66 8 0.1

Compac Industries Ltd.

Page 106 www.compac.co.nz