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Global Power Technologies
START-UP AND OPERATION
05585 rev11 | Model 8550-SD
Page 18 of 53
The Power Unit output power can be measured by multiplying the Power Unit voltage with the
Power Unit current. For example, if the Power Unit voltage is 25 V and the Power Unit current is
22.2 Amps, then the Power Unit output power is 555.0 Watts:
25.0 x 22.2 = 555.0 Watts
11.
Using the above formula, measure the output power and record it on the Start-Up Data Sheet at
15, 30, 40, 50, and 60 minutes after start-up.
WARNING!
Do not allow the Power Unit voltage to exceed 35 Volts. Turn off the fuel if the
Power Conditioner fails to control the voltage.
As the Power Unit output power climbs, ensure that it does not exceed the Set Power. The
power level should be at around 70 to 80% of Set Power within 30 minutes after ignition.
If the power is above 80% of Set Power after 30 minutes, continue to monitor the Power
Unit output power. Be prepared to reduce the fuel pressure if the power rises above the Set
Power level.
If the power level rises to more than 10 watts above Set Power, initially reduce the pressure
by 1 psi and wait 10 minutes, then determine if further adjustment is needed. Remember
that it will take up to 10 minutes for the full effect of the fuel pressure change to stabilize.
Record any changes in fuel pressure on the Start-Up Data Sheet.
If the power level is less than 70% of Set Power after 30 minutes, the fuel pressure may be
too low. Wait until the power level has stabilized and make the necessary adjustment.
NOTE:
Keep the cabinet door closed, as much as possible, during the warm-up period until
the Power Unit output power stabilizes. It takes about one full hour for the power to
stabilize.
12.
Review the recorded data on the Start-up Data Sheets and compare the Power Unit output
power recorded at 60 minutes with that at 50 minutes. The two readings should be within 5
Watts of each other. If the power level is not yet stabilized, wait another 10 minutes.
13.
Once the power level has stabilized determine if the Power Unit output power is within 5 Watts
of the Set Power.
If the Power Unit output power is more than 5 Watts above Set Power, decrease the fuel
pressure by approximately 0.25 to 0.50 psi (1.7 to 3.4 kPa), and wait 10 minutes.
After 10 minutes, determine if further adjustment is needed.
If the Power Unit output power is more than 5 Watts below Set Power, increase the fuel
pressure by approximately 0.25 to 0.50 psi (1.7 to 3.4 kPa), and wait 10 minutes.
If the Power Unit output power is more than 20 Watts below Set Power, increase the fuel
pressure approximately 0.50 to 1.0 psi (3.4 to 6.8 kPa). After 10 minutes, determine if
further adjustment is needed.
14.
Once the Power Unit output power has stabilized to within 5 Watts of Set Power and stayed
there for at least 15 minutes, proceed to the next section for Air Shutter Adjustment.