User's Manual

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40/70 Issue 01 - April 2001 - Draft 03 3CC12425AAAA TQ BJA 01

– For the mains connection, use only the connection cable supplied with the equipment.

– Never use an extension cable for connecting the NT unit to the power source.

Stages (Figure 21 – The NT unit (85 – 264 V 47 – 63 Hz) )

1. Connect the X-Pol RT/NT connection cable.

2. To ground the NT unit in this way, carry out the procedures described in Chapter 3 – Installation of

the X-Pol RT’s A7390 Terminal Station. Use the lug and screw hardware supplied with the

equipment, ref. 7.

3. Check that the mains socket to which the NT is to be connected supplies voltage compliant with the

equipment characteristics and that it is fitted with an earth.

4. (ref. 5)

• For NCAxxx: connect the NT connection cable to the NT connector and then to the mains.

• For NGAxxx: connect the 48V cable to the HE15-3 connector, then to the 48V arrival.

5. Power-up the NT unit using the On/Off switch (ref. 6); the green "Power on" LED (ref. 3) lights up.

The red "Alarm" LED (ref. 4) lights up (searching for the carrier frequency) then flashes at different

rates according to the current phase:

• slow flashing: automatic scanning over the frequencies,

• fast flashing: frame recovery (authentication by the serial number) once the frequency is

found.

Malfunctions to the installation:

The A7390 is a reliable and easy-to-install system. By following the procedures described in the

documentation, no problems should occur. However, if these procedures have been poorly applied, here

is a list of the possible problems that may arise.

Manifestation of

the problem

Possible causes Solution

The red NT LED is

flashing slowly.

1 Errored NT declaration.

2 Poor connector contact.

3 Cable damaged or

severed.

4 Alignment problem.

5 Incorrect X-Pol RT set-

tings.

6 X-Pol RT breakdown.

7 NT breakdown.

1 Check NT declaration.

2 Check connectors. Secure loo-sely cabled

connectors.

3 Check installation wiring. Change damaged

cables.

4 and 5 Reconfigure and check antenna alignn-

ment.

6 Replace X-Pol RT.

The red NT LED is

flashing quickly.

1 Bad transmission.

2 Incorrect NT settings.

1 Delete and recreate the managed NT using

the 7390LT.

Check the allocation of the correct NT serial

number.

2 and 3 Reconfigure and check antenna alignn-

ment.

4 Replace X-Pol RT.

The red NT LED

rest lit uninterrup-

ted

1 Check the NT supply

voltage

2 NT breakdown.

Try a swith off/switch on, and if the LED remains

red, replace NT.