Wood’s Powr-Grip MRTA811LDC - Manual (Page 23)

Rev 9.0/6-12 21 MRTA8-DC: #35075
B
ATTERY
T
EST
The lifter is equipped with a battery gauge to help the operator evaluate
whether the battery has adequate energy for lifting. Factors such as the
condition of the battery, the time required to execute a lift, and the
porosity of the load combine to determine how much battery energy is
needed. It is the operator’s responsibility to evaluate these
conditions and to make sure the battery has sufficient energy to
complete a lift safely. Check the battery energy before every lift and
also at the end of each day's use, to decide whether a charge is needed
(see B
ATTERY
R
ECHARGE
to follow). 14 Never use the lifter when battery
energy registers lower than 50% (that is, when only red lights are illuminated), regardless of the
estimated energy requirement.
WARNING: Never use lifter if battery energy is lower than 50% of capacity.
When the power switch is in the “ON” position, the battery gauge automatically monitors battery
energy. However, the battery gauge shuts off temporarily while the vacuum pump is running, to
prevent an inaccurate reading. When the pumping cycle is completed, the battery gauge
requires a few moments to stabilize before it displays an accurate energy reading again.
When the power switch is in the “OFF” position, the battery energy can be checked manually
using the battery test button. If the lifter has not been used since the battery was charged, the
battery gauge may falsely indicate an energy level that is higher than actual, due to a “surface
charge” on the battery. After the pump runs for approximately one minute, the surface charge
dissipates, allowing the operator to take an accurate energy reading.
B
ATTERY
R
ECHARGE
Only use a battery charger supplied by or approved by Wood's Powr-Grip; other chargers may
reduce battery life. Charge the battery as soon as possible after any extended use of the lifter,
or whenever the battery gauge indicates diminished energy (see B
ATTERY T EST preceding).
Temperatures above 70° Fahrenheit [21° Celsius] require the battery to be charged more
frequently.
CAUTION: Charge the battery only while the power switch is in “OFF” position.
Operating the lifter when the charger is connected to an AC power source could result in
permanent damage to the charger.
Identify the input voltage marked on the battery charger, and plug it in to an appropriate power
source. 15 The power source must be equipped with a ground fault circuit interrupter, in order to
reduce the risk of electrical shocks.
WARNING: Power source must be equipped with ground fault circuit interrupter.
Usually a battery takes no more than 16 hours to charge completely, after which the charger
shuts off automatically. The blue light on the battery gauge also turns on, to indicate that the
14
The battery charger must be disconnected from its AC power source in order to test the battery energy; otherwise, the energy
reading on the battery gauge would not be accurate.
15
Any external power supply must conform to all applicable local codes.