TI5679 MPU-24
9
Section 3 – Operating Procedures
3.1 – Operating Procedures
This section deals with normal procedures, and includes all steps necessary to ensure safe and efficient
operation of the TI5679 MPU-24.
!
When the TI5679 MPU-24 is not in use, it should always remain plugged into
a suitable ac power source to insure operational readiness at all times.
NOTE
!
If current demand exceeds 10 amps, converter output voltage will drop
below 28.5 Vdc and two or more LED status indicator bars will illuminate.
If all LED status indicator bars illuminate, both the converter and power
cells are supplying 24 Vdc power output.
NOTE
3.2 – General
Correct operation of the TI5679 MPU-24 includes both pre-use and operational checks of the unit. Knowledge
of the operating limits, restrictions, performance, unit capabilities and functions is fundamental to correct
and safe operation. The operator shall ensure compliance with the instructions in this manual that affect
operational safety and the warranty of the unit.
3.3 – Operating Limits and Restrictions
The minimum, maximum and normal operating ranges result from careful engineering and evaluation of test
data. These limitations must be adhered to during all phases of operation.
3.4 – Performance
Refer to Section 7, PERFORMANCE DATA to determine the capability of the TI5679 MPU-24. Consideration
must be given to changes in performance resulting from variations in ambient temperature, mode of
operation, state of charge (with or without 120 or 240 Vac power), and aircraft dc bus system inefficiency
(voltage drops).
Figure 3.4.1 Starting S-61 Sikorsky aircraft with TI5679 MPU-24