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Heat Sink Duct Mounted Fan
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TM-11-6130-377-14 Inverter Power Static PP-7078/U Manual
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Low Voltage Fault Adjustment
TM 11-6130-377-14
WARNING
k. Close front indicator panel and secure the four
To avoid injury and possible death of
turn fasteners.
personnel, use extreme caution with
l. Position back panel in place and align screw
all  components  marked  "HIGH
holes. Install ten long screws and lockwashers in the
VOLTAGE."
Ensure
that
all
outboard screw holes and three short screws and
capacitors  are  discharged  after
lockwashers in the center three holes. Tighten screws.
power has been removed.
m. Perform functional verification of the inverter
a. Position the DC circuit breaker A1CB1 to OFF.
b. Open front indicator panel to give access to
interior of unit.
6-20.
Resistor A1R6 Replacement (1973 Model
Only)
NOTE
To remove and replace a defective A1R6 resistor
Step c is to be accomplished only if a
proceed as follows:
rear pair of capacitors, either right or
a. Position the DC circuit breaker A1CB1 to OFF.
left side, must be removed.
b. Remove twelve screws and washers securing
the top cover of the inverter and remove cover.
c. Remove 13 screws and washers securing the
c. Remove the electrical leads from the resistor
rear panel and remove the rear panel.
terminals. Tag the leads to ensure proper replacement.
d. Disconnect and tag the electrical leads to the
d. Remove two screws, washers and nuts securing
capacitors to be removed.
resistor to side panel and remove resistor.
e. Working from the outside of the unit, remove
e. Position new resistor on side panel and install
the two screws and lockwashers securing the capacitor
two screws from side panel through mounting lugs of
clamp for the pair which is to be removed.
resistor. Install washers and nuts, tighten nuts to secure
f. Lift up and remove the capacitor(s).
resistor.
g. Position a new capacitor in place of the one or
f. Install  electrical  leads  to  their  respective
more removed in step f.
terminals of the resistor.
h. Install the capacitor clamp around the capacitors
g. Position the top cover in place and align the
and align the screw holes in the clamp and side panel.
screw holes. Install twelve screws and lockwashers and
i. Install the two screws and lockwashers and
tighten screws.
tighten screws.
h. Perform a functional verification of the inverter
j. Reconnect the electrical leads to their proper
terminals.
Section IV. VERIFICATION AND ADJUSTMENT
6-21.  General
capacitors  are  discharged  after
This section contains procedures for performing a low
power is removed and do not attach
and high voltage fault adjustment and a functional
test equipment with the Inverter
verification of the inverter operation.  The following
operating.
procedures  are  performed  when  troubleshooting
indicates that an adjustment of functional verification is
a. Open front panel to gain access to the DC
required.
INPUT terminals and the AC OUTPUT terminals.
b. Pull out the plunger of the door interlock switch
6-22.
Functional Verification of the Inverter
A1S1 to enable the inverter to function with the front
panel open (para. 6-5).
WARNING
c. Install the test equipment and connect it to the
To avoid injury and possible death of
inverter as shown in figure 6-2.
personnel, use extreme caution with
d. Set the DC variable power source to 115 vdc.
all  components  marked  "HIGH
VOLTAGE."  Be  sure  that  all
Change 1
6-17

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