Teledyne ADFM Analog Output Module, Техническое руководство, Страница: 38 / 156

Chapter 4
a. In a non-corrosive atmosphere, remove the top of the unit.
b. Unscrew the two screws securing the housing cover and open the
cover.
c. The desiccant bag holder is attached to the front panel with cable
ties. Remove the ties and replace the desiccant.
d. Use cable ties to attach the desiccant holder to the front panel.
4-3 Battery Replacement
The Electronics Unit contains two types of batteries: the system (alkaline
lantern or lead acid) batteries and the real-time clock back-up battery.
CAUTION. Before attempting to replace existing batteries, be sure that
mains power source is disconnected. It is advised that only qualified
personnel attempt this replacement procedure.
4-3.1 Replacing the Alkaline Lantern System Batteries
The ADFM’s internal batteries use four 6-volt alkaline lantern type batteries
with a nominal capacity of 13 Ah each (see
Table 4-16, item 03 ). The
nominal voltage is 24V for all batteries connected in series, while the low
voltage is 20V. They are also commonly available. MGD recommends
purchasing spare Energizer
™
alkaline lantern batteries.
CAUTION. If the Electronics Unit is connected to a mains power, for your
own personal safety we recommend that you disconnect mains first before
opening the Electronics Unit housing.
a. In a non-corrosive atmosphere, remove the top of the unit.
b. Unscrew the two screws securing the housing cover and open the
cover.
c. Remove the battery cover by removing the four screws
d. Replace all four batteries with new batteries.
e. Replace the battery cover.
f. Test the system (see Chapter 5 ).
CAUTION. Do not short out battery leads when removing the batteries.
High currents may flow during shorts, and fire or personal injury may result.
THERE IS NO FUSE IN SERIES WITH THESE BATTERIES!
page 4-2 MGD Technologies, Inc.