Operating instructions

8.10 Internal Fuse Replacement

CAUTION: WHENEVER CHECKING OR REPLACING A FUSE ON THE MAIN POWER

BOARD, MAKE SURE THAT THE POWER MODULE IS COMPLETELY POWERED

DOWN BY SWITCHING THE BATTERY BREAKER OFF (OR REMOVING THE BATTERY

FUSE) AND UNPLUGGING THE AC POWER CORD.

The AM Series Power Module contains two internal fuses (one 1 Amp and one 10 Amp). The

fuses are clearly marked and located on top of the main power board, directly behind the

ammeter.

1 Amp Fuse -

The 1 Amp fuse protects the DC circuit that powers the red STANDBY lamp on the module’s

front panel and the optionally-mounted, LRI lamp. If a short occurs in the lamp circuit, the

fuse will open. This will not affect the overall operation of the power supply. The fuse should

be replaced with an identical type fuse (1A 250V AGC1).

10 Amp Fuse -

The 10 Amp fuse, which is to the right of the 1 Amp fuse, protects the DC charger circuit and

opens if battery polarity is reversed at pins 1 and 2 on the 10-pin terminal strip. Check this

fuse if there is no charger voltage present at pins 1 and 2. An open fuse may also indicate

a charger problem. The fuse should be replaced with an identical type fuse (10A 250V

ABC10).

8.11 Additional Maintenance

In addition to normal preventive maintenance, enclosures and power modules should be

cleaned periodically and checked for signs of battery acid corrosion, or buildups of dirt.

Procedure:

1. Power down the module by disconnecting the batteries and unplugging the AC power

cord. Carefully remove the power module from the enclosure. Remove the batteries

from the battery compartment.

2. Clean the module with a strong soapy solution using a brush to get into hard-to-reach

areas. Use a soft rag to dry the module.

3. Clean the enclosure. Replace or re-fasten torn or loose bug screens. If there has been

any leakage from the batteries, spray the battery compartment with an anti-corrosion

agent, or apply a liberal sprinkling of baking soda to help neutralize the acid.

4. Tighten the mounting bolts that secure the enclosure to the pole.

5. Re-install the power module and batteries. Check all connections for tightness and test

the unit for proper operation.

8. PREVENTIVE MAINTENANCE