2.  
Remove the two mounting bolts and nuts securing the master contactor relay to the left side of the box. Note the location of components secured by these same bolts.

3.  
Remove the six mounting bolts securing the box and remove the box.

INSTALLATION OF BATTERY BOX. (Refer to Figure 24-2)
1.  
Position the battery box in place and secure with six bolts previously removed.

2.  
Position the master contactor relay on the left side of the box and secure with the two bolts and nuts previously removed.  Insure the proper connection of any components previously disconnected.

3.  
Install the battery and make the appropriate connections.

BATTERY BOX CORROSION PREVENTION.
Check the battery for spilled electrolyte or corrosion at least every 30 days, but not later than each 50 hour inspection, whichever comes first.  Remove the battery and remove any corrosion found in the box, on the terminals, on or around the battery by the following procedure:
1.  Remove the box drain cap from the underside of the fuselage and drain off any electrolyte that may have overflowed into the box.
— CAUTION —
DO NOT ALLOW BAKING SODA TO ENTER BATTERY.
2.  
Clean the battery and the box. Neutralize corrosion effects by applying a solution of baking soda and water mixed to the consistency of thin cream.  Continue application until bubbling action has ceased.

3.  
Rinse the battery and box with clean water and dry.

4.  
Place the cap over the battery box drain.

5.  
Install battery. (Refer to battery installation.)

24-30-00 Page 24-18 Revised: February 28, 2002
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VOLTAGE REGULATORS AND OVERVOLTAGE RELAYS.
LAMAR MODEL NO. B-00392-1 ALTERNATOR VOLTAGE REGULATOR.
The voltage regulators and shunts are mounted on a panel that is secured to the left bulkhead at F.S. 35.000. They are accessible by opening the aircraft nose section.  The top units are connected to the left engine alternator and the bottom units are connected to the right side.
LAMAR MODEL NO. B-00392-1 VOLTAGE REGULATOR OPERATION
1.  
The Lamar No. B-00392-1 voltage regulator delivers a pulse width modulated field control output, as required, to maintain the alternator output voltage.

2.  
An overvoltage protection is incorporated, which latches off regulator output following an overvoltage event.

3.  
The regulator is protected against damage due to output (field) short to ground.  A short will latch off the output until reset.

4.  
Momentarily turn OFF 14 Volt power supply to reset latch off caused by either an overvoltage or shorted output.

5.  
Field pulse rise and fall times are slowed to be more that 50 microseconds.

6.  
Refer to Figure 24-8 to check overvoltage operation.  Temporary indicator will be activated when overvoltage circuit locks out.  (See CAUTION.)

7.  
In an operating system (2 units with equalizer connection), an excess current in one shunt, due to an overvoltage condition in that side, will cause the opposite side overvoltage sensing to be desensitized. The side causing the overvoltage will be selectively tripped.  Excess shunt current will then fall to zero, which permits the normal side overvoltage sensitivity to restore to its calibrated value.

8.  
Except for the equalizer connection, the left and right alternator systems are independent of each other. The equalizer connection will NOT cause a failure in one system to disable the other normal operating system.

24-30-00 Page 24-19 Revised: February 28, 2002
9.  The equalizer circuit may be faulted to either ground or the bus with no damage to either system. Balancing action and selectivity of the overvoltage trip protection will be lost.  If the equalizer faulted to the bus, system voltage will increase to the limit of balancing circuit control authority (less than 1 Volt).  The overvoltage operating point of both systems will be elevated to the value provided for selective trip action (approximately 2 Volts above the normal overvoltage trip calibration point).
ADJUSTING VOLTAGE REGULATOR UNIT.  (LAMAR MODEL NO. B-00392-1)
The only adjustment necessary to maintain the alternator system is the adjustment of the voltage control on the voltage control unit.  A voltage of 14 volts dc is automatically maintained.  All other adjustments are made at the time of installation and need not be reset.
— CAUTION —
IN-AIRCRAFT TESTING WITH ALTERNATOR RUNNING IS NOT RECOMMENDED.  DO NOT BYPASS REGULATOR BUS TO FIELD AS A MEANS OF CHECKING ALTERNATOR  WITH ALTERNATOR RUNNING.
　
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