TB 1-1730-229-30-03
WARNING
Before opening pneumatic load bank AIR FLOW valve in the next step,
ensure that all personnel are clear of air exhaust port.
______ d.
Set Load Bank to approximately 60 lb/min by slowly opening the load
pneumatic valve to increase flow. In warmer ambient air the 60 lb/min
may not be obtained. Verify that the EGT does not exceed 1250F.
Slowly open the pneumatic load bank valve and observe the AGPU EGT
meter. Open the valve, slowly, until the EGT stops increasing.
Record EGT reading, flow and the pressure at which the EGT stopped rising.
EGT: _______
Load Bank Flow: ______
AGPU Pressure: ______
______ e. Set the PNEUMATIC POWER switch to OFF. Observe that the pneumatic hose pressure
returns to 2 psig within five seconds, before proceeding to the next step.
Record Ambient Temperature _________F
4.5.3
AC System Check.
4.5.3.1 Perform AC system check as follows:
NOTE
For all steps that follow, all controls and indications are on the main
AGPU control panel unless otherwise stated.
NOTE
The following electrical load bank settings are approximate only. Slightly
different current thresholds in the various AGPU units will require slight
variations of the load. The following load bank settings may vary 20%.
_____ a. AGPU Running
_____ b. Set PHASE SELECT switch to A.
_____ c.
Check the mechanical zero on three AGPU AC meters (VOLTS, HERTZ, and % LOAD).
CAUTION
If abnormal indications are observed in the following steps, set the AC
POWER switch to OFF and discontinue test until problem is corrected.
d. Phase Sequence Verification
(1) Set AC POWER switch to ON.
(2) Verify the phase rotation is clockwise, indicating direction A, B, C.
(3) Set AC POWER switch to OFF.
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