DeWalt DHS790 - Important Safety Instructions for All Battery Packs; Battery Pack Handling and Storage

4
ENGLISH
ON MOTOR HOUSING:
TO REDUCE THE RISK OF INJURY, USER MUST READ INSTRUCTION MANUAL. WEAR EYE
PROTEXCTION AND RESPIRATORY PROTECTION. USE ONLY IDENTICAL REPLACEMENT PARTS.
DO NOT EXPOSE TO RAIN OR USE IN DAMPLOCATIONS.
ON MOVING FENCES:
ALWAYS ADJUST FENCE PROPERLY BEFORE USE. CLAMP SMALL PIECES BEFORE CUTTING.
SEEMANUAL.
ON GUARD:
DANGER–KEEP AWAY FROM BLADE.
ON UPPER GUARD:
PROPERLY SECURE BRACKET WITH BOTH SCREWS BEFOREUSE.
ON TABLE: (2 PLACES)

WARNING: KEEP HANDS AND BODY OUT OF THE PATH OF THE
SAW BLADE. CONTACT WITH BLADE WILL RESULT IN SERIOUS
INJURY. DO NOT OPERATE SAW WITHOUT GUARDS IN PLACE.
CHECK GUARDING SYSTEM TO MAKE SURE IT IS FUNCTIONING
CORRECTLY. DO NOT PERFORM ANY OPERATION FREEHAND.
NEVER REACH IN BACK OF SAW BLADE TURN OFF TOOL
AND WAIT FOR SAW BLADE TO STOP BEFORE MOVING WORKPIECE OR CHANGING
SETTINGS OR MOVING HANDS. NEVER CROSS ARMS IN FRONT OF BLADE. ALWAYS
TIGHTEN ADJUSTMENT KNOBS BEFORE EACH USE. DISCONNECT POWER BEFORE
CHANGING BLADE ORSERVICING.
ON TABLE: (2 PLACES)
Electrical Connection
Be sure your power source agrees with the nameplate marking. 120 volts, AC means that your
saw will operate on alternating current. Do not operate with DC power. A voltage decrease of 10
percent or more will cause a loss of power and overheating. All
DeWALT
tools are factory tested. If
this tool does not operate, check the powersupply.
This miter saw operates on either two 60V battery packs or by using the
DeWALT
corded
powersupply.
Using the Corded Power Supply (Fig. B)
The
DeWALT
corded power supply is designed to provide power for
DeWALT
120V Max*
FLEXVOLT cordless tools. Insert the corded power supply into the miter saw battery slot (refer to
Installing and Removing the Corded Power Supply into and from Tool and plug the power
supply into an AC outlet. The power supply will act as the power source to the tool. Your
DeWALT
corded power supply should only be used with standard household 120 VAC, 60 Hz power or a
120VAC 60Hzgenerator.
The corded power supply is suitable for use with both grounded and double insulated 120V AC
tools. When the power supply is utilized with a grounded tool, the tool inlet will be equipped
with a ground prong that allows the ground path from the tool to connect to the power supply.
When the power supply is used with this double insulated miter saw, no ground connection is
made from the tool to the power supply as no ground connection isrequired.
Fig. B
Additional Specific Usage Instructions
The corded power supply may become warm to the touch during use. This is a normal condition
and does not indicate aproblem.
IMPORTANT. The power supply is not user serviceable. There are no user serviceable parts inside
the powersupply.
Servicing at an authorized service center is required to avoid damage to static sensitive
internalcomponents.
BATTERIES AND CHARGERS
The battery pack is not fully charged out of the carton. Before using the battery pack and charger,
read the safety instructions below and then follow charging proceduresoutlined. When ordering
replacement battery packs, be sure to include the catalog number andvoltage.
Your tool uses a
DeWALT
charger. Be sure to read all safety instructions before using your charger.
Consult the chart at the end of this manual for compatibility of chargers and batterypacks.
READ ALL INSTRUCTIONS
Important Safety Instructions for All Battery Packs

WARNING: Read all safety warnings and all instructions for the battery pack,
charger and power tool. Failure to follow the warnings and instructions may result
in electric shock, fire and/or seriousinjury.
• Do not charge or use the battery pack in explosive atmospheres, such as in the presence
of flammable liquids, gases or dust. Inserting or removing the battery pack from the charger
may ignite the dust orfumes.
• NEVER force the battery pack into the charger. DO NOT modify the battery pack in any
way to fit into a non-compatible charger as battery pack may rupture causing serious
personal injury. Consult the chart at the end of this manual for compatibility of batteries
andchargers.
• Charge the battery packs only in designated
DeWALT
chargers.
• DO NOT splash or immerse in water or otherliquids.
• Do not store or use the tool and battery pack in locations where the temperature may
reach or exceed 104°F (40°C) (such as outside sheds or metal buildings in summer). For
best life store battery packs in a cool, drylocation.
NOTE: Do not store the battery packs in a tool with the trigger switch locked on. Never
tape the trigger switch in the ONposition.
• Do not expose battery pack or tool/appliance to fire or excessive temperature. Exposure
to fire or temperature above 265°F (130°C) may cause explosion.
• Do not incinerate the battery pack even if it is severely damaged or is completely worn
out. The battery pack can explode in a fire. Toxic fumes and materials are created when lithium
ion battery packs areburned.
• If battery contents come into contact with the skin, immedicately wash area with mild
soap and water. If battery liquid gets into the eye, rinse water over the open eye for 15 minutes
or until irritation ceases. If medical attention is needed, the battery electrolyte is composed of a
mixture of liquid organic carbonates and lithiumsalts.
• Contents of opened battery cells may cause respiratory irritation. Provide fresh air. If
symptoms persist, seek medicalattention.

WARNING: Burn hazard. Battery liquid may be flammable if exposed to spark orflame.

WARNING: Fire hazard. Never attempt to open the battery pack for any reason. If the
battery pack case is cracked or damaged, do not insert into the charger. Do not crush, drop
or damage the battery pack. Do not use a battery pack or charger that has received a sharp
blow, been dropped, run over or damaged in any way (e.g., pierced with a nail, hit with
a hammer, stepped on). Damaged battery packs should be returned to the service center
forrecycling.
Transportation

WARNING: Fire hazard. Do not store or carry the battery pack so that metal objects
can contact exposed battery terminals. For example, do not place the battery pack
in aprons, pockets, tool boxes, product kit boxes, drawers, etc., with loose nails, screws,
keys, etc. Transporting batteries can possibly cause fires if the battery terminals
inadvertently come in contact with conductive materials such as keys, coins, hand
tools and the like. The US Department of Transportation Hazardous Material Regulations
(HMR) actually prohibit transporting batteries in commerce or on airplanes in carry-on
baggage UNLESS they are properly protected from short circuits. So when transporting
individual battery packs, make sure that the battery terminals are protected and well
insulated from materials that could contact them and cause a shortcircuit.
NOTE: Lithium-ion batteries should not be put in checkedbaggage.
Shipping the
DeWALT
FLEXVOLT® Battery
The D
e
WALT FLEXVOLT® battery has two modes: Use and Shipping.
Use Mode: When the FLEXVOLT® battery stands alone or is in a D
e
WALT 20V Max* product, it will
operate as a 20V Max* battery. When the FLEXVOLT® battery is in a 60V Max* or a 120V Max* (two
60V Max* batteries) product, it will operate as a 60V Max* battery.
Shipping Mode: When the cap is attached to the FLEXVOLT®
battery, the battery is in Shipping Mode. Strings of cells are
electrically disconnected within the pack resulting in three
batteries with a lower Watt hour (Wh) rating as compared to one
battery with a higher Watt hour rating. This increased quantity
of three batteries with the lower Watt hour rating can exempt the pack from certain shipping
regulations that are imposed upon the higher Watt hourbatteries.
The battery label indicates two Watt hour ratings (see example). Depending on how the battery
is shipped, the appropriate Watt hour rating must be used to determine the applicable shipping
requirements. If utilizing the shipping cap, the pack will be considered 3 batteries at the Watt
hour rating indicated for “Shipping”. If shipping without the cap or in a tool, the pack will be
considered one battery at the Watt hour rating indicated next to “Use”.
USE: 120 Wh Shipping: 3 x 40 Wh
Example of Use and Shipping Label Marking
For example, Shipping Wh rating might indicate 3 x 40 Wh, meaning 3 batteries of 40 Watt hours
each. The Use Wh rating might indicate 120 Wh (1 battery implied).
Fuel Gauge Battery Packs (Fig. C)
Some
DeWALT
battery packs include a fuel gauge which consists of three green LED lights that
indicate the level of charge remaining in the batterypack.