Nautel XR12, Installation Manual, Page: 71 / 92

XR12 Installation Manual Commissioning tasks
Issue 3.0 2009-07-15 Page 11-3
Commissioning
Turning on the transmitter
1. Terminate the transmitter's RF output into a precision, 50
Ω
, resistive dummy load that is
able to dissipate the RF power being applied to it: 12 kW carrier, 18 kW total required.
2. Verify that all panels are installed, and ensure that their attaching hardware is firmly
tightened.
3. Simulate the closing of all external interlocks. This requires a short circuit between TB1-1
and TB1-2 of the remote interface PWB. Ensure all networks connected to the transmitter’s
RF output are properly covered.
4. In lieu of normal station programming, connect an audio signal generator, preset to 1000 Hz
at a zero output level (turned off), between TB2-1 (+) and TB2-3 (-) on the remote interface
PWB.
5. Switch on the ac power at the service entrance to turn on the transmitter.
6. Look through the window on the left side of the transmitter’s lower rear panel (as seen from
the back). Verify that all four power status LEDs are on.
7. Check the alarm and status indicators (the front panel and GUI). See the XR12 Operating and
Maintenance Guide .
8. Check the output of the B+ power supply on the GUI. The voltage should be between 320
and 340 V dc.
9. Check the output of the 5, 15, and 24 V power supplies on the GUI.
10. Select
Local
control.
WARNING:
If a jumper is placed between interlock inputs TB1-1/TB1-2 on the
remote interface pwb, safety features controlled by the external
interlocks will be disabled. A fail safe method of alerting personnel to
this fact should be implemented. Voltages which are dangerous to life
will be present on the RF output stages and the antenna system if the
transmitter is turned on.