TI1500 GPU-12
18
3
Operating Procedures
3.11 – Regulated 14.25 VDC Ground Power
Connecting DC Power Cable To Unit
Line up the dc plug with the receptacle. Push forward while rotating the T-handle one full turn clockwise.
Ensure dc power cable plug is fully seated into the GPU’s DC Battery Receptacle. The unit is now ready to
safely transfer power.
Figure 3.11.1 Attaching DC Power Cable to TI1500 GPU-12
Low Power Demand
Low power demand is defined by a requirement of 20 amps or less. Connect dc power to aircraft ground
power receptacle. DC bus power should come on and aircraft voltmeter should indicate 14.25 Vdc to 13.5
Vdc (13 Vdc minimum). If aircraft power demand is less than 20 amps converter output will remain at 14.25
Vdc (only one GREEN LED status indicator bar will illuminate). If aircraft power demand exceeds 20 amps
converter voltage output will decrease and two or more LED status indicator bars will illuminate.
NOTE
!
When all LED status indicator bars illuminate, both the converter and power
cells are supplying 12 Vdc power output for current demands above 20 amps.
High Power Demand
High power demand is defined by a requirement of greater than 20 amps. Connect to aircraft ground power
receptacle. DC bus power should come on and aircraft voltmeter should indicate 14.25 Vdc to 12 Vdc. If
current demand is greater than 20 amps, converter output voltage will drop below 14 Vdc and LED status
indicator lights will illuminate indicating current is being drawn from the power cells. The greater the current
draw, the quicker the LED status indicator will approach red. Note the LED status indicator shows the status
of the power cells.
