186 Part H: Diagnosing © Tait Electronics Limited December 2007Test the fan after fixing a fan problem or fitting a new fan. When you fit a fan,use this test to verify that the fan is correctly connected, so that the PMU (andnot the PA) activates it.Note: The base station can detect the motion of 3-wire fans and willraise an alarm if the fan does not operate.To test the fan1. Select Diagnose > Power Management > Control Tests.1. Click Toggle to the left of the PMU fan LED. If the fan was off, this shouldturn it on.2. Check that the fan is operating.After ten seconds, the test automatically ends and the base station takes backcontrol of the fan.Testing the PMU fault LEDYou can test that the red LED on the front of the PMU is able to light up inresponse to a fault. (The PMU has a pair of LEDs: a green status LED and a redfault LED. They are only visible when the front panel is removed.)1. Select Diagnose > Power Management > Control Tests.2. In the Control Tests form, click the Start Test button that is to the left ofthe PMU fault LED. This uncouples the LED from the PMU’s operationallogic.3. Remove the base station front panel, and check that the PMU LED isflashing on and off.4. Click Stop Test to restore the LED’s connection with the PMU.Testing the Auxiliary Power OutputIf the PMU is fitted with an auxiliary power supply submodule, you can testthe PMU’s ability to switch its output on and off.Note: The auxiliary power output must be on. If it is configured tobe on only when the PMU uses AC mains power, make sure thatthe PMU is not using battery power.1. Select Diagnose > Power Management > Control Tests.2. Click Start Test at the bottom of the form.3. Click the Toggle button above the Aux Output box.The state of the LED should change.4. Click Stop Test.
