
2. MAINTENANCE
5
(3) Voltmeter (Left), Ammeter (Right)
Monitor battery voltage and electric current during charging of radio battery. The battery voltage
is kept between 25.0 VDC and 28.0 VDC in the flooded lead-acid battery, and 26.7 VDC in the
valve-regulated lead-acid battery.
(4) BUZZER STOP switch
This switch silences the buzzer. The buzzer sounds when the battery is abnormal or AC power
fails.
(5) TEST switch/Volume
This switch starts the voltage drop test. Do the test as follows:
1. Push the TEST switch to start the voltage drop test.
2. Rotate the encoder knob next to the TEST switch fully-clockwise.
3. Slowly rotate the encoder knob counterclockwise to swing the voltage pointer.
4. Confirm that the buzzer sounds when the pointer is lower than approx. 22 V.
5. Push the BUZZER STOP switch to silence the buzzer.
6. Push the TEST switch to finish the test.
(6) BATTERY CHARGER switch
<For Valve-regulated lead-acid battery (maintenance free battery)>
• [AUTO]: Set the switch to [AUTO] al-
ways. The battery voltage is kept be-
tween 26.5 VDC and 27.0 VDC.
• [OFF]: Disconnects the charger from the
radio battery.
Care of the battery
The lead-acid battery powers the radio
console when the ship’s mains power and
emergency power fail, to enable communi-
cation in the event of distress. Therefore,
follow the points mentioned below to keep
the battery in good working order.
1) Confirming charging
Confirm that the BATTERY CHAR-
GER switch on the control panel is set
to [AUTO]. Further, confirm that the
voltage shown on the battery voltage meter on the control panel is normal (between 26.5
VDC and 27.0 VDC).
2) Cleaning
The battery and the area around it should always be clean and dry. Clean the battery case
with a water-moistened cloth. Do not use organic solvents, thinner, gasoline, benzine or al-
cohol to clean the battery. (They may crack the case.) For heavy dirt, clean the case with
white kerosene.
3) Environmental conditions
• Keep the battery out of direct sunlight.
• Coat the nuts and bolts which tighten the battery contacts with anticorrosive paint. Check
the battery once a year, retighten nuts and bolts if necessary.
WARNING
Do not remove or disassemble the safety
tap of the lead-acid battery.
Removal may cause the battery to explode,
lower its performance or shorten its life.
The temperature of the electrolyte in the
lead-acid battery should keep between
-15°C and 45°C.
The electrolyte can cause explosion if it
becomes too hot.