Rev 34.7/3-20
18
MR1611LDC: #35050
Monitoring the Low Vacuum Warning Buzzer (if applicable)
If the lifter is equipped with a low vacuum warning buzzer, an alarm sounds until the lifter attains
sufficient vacuum to lift the maximum load weight (see SPECIFICATIONS: Load Capacity). After
the lifter has attained this vacuum level, the alarm stops sounding, to indicate that the lifter is
ready to lift the load.
WARNING: Never attempt to lift load while alarm is sounding.
Do not attempt to lift the load while the alarm is sounding; such an attempt could result in a load
release and injury to the operator.
If the vacuum system experiences leakage while the lifter is attached to the load, the vacuum
pumps turn on automatically, as required to maintain sufficient vacuum. The alarm also sounds
while the pumps are running, to signal the reduction in vacuum to the operator. If the alarm
sounds while you are lifting a load, make sure the vacuum gauge shows a vacuum level of 16"
Hg [-54 kPa] or higher. If not, immediately move away and stay clear of the load until it can be
lowered to the ground or a stable support.
WARNING: Stay clear of any suspended load while alarm is sounding.
Discontinue lifter use until the cause of the vacuum loss can be determined. Using the lifter on
contaminated, rough or porous surfaces may result in a vacuum loss, due to leakage between
the vacuum pads and the load. Since the alarm may sound in such circumstances, consult the
section T
O
A
TTACH THE
P
ADS TO A
L
OAD
: Vacuum Level on Other Surfaces to determine whether the
lifter can be used to lift the load. If the vacuum loss is due to any other cause, perform
inspection and maintenance as needed to identify and correct any deficiency before resuming
normal operation of the lifter.
Controlling the Lifter and Load
When vacuum indicators show that the lifter is ready, use the hoisting equipment to raise the
lifter and load as needed to clear any obstacles in their path. Use any appropriate means to keep
the lifter and load in the desired orientation while they are suspended from the crane. Once
sufficient clearance is established, the load can be rotated as desired (see T
O
R
OTATE THE
L
OAD
E
DGEWISE
to follow).
In Case of Power Failure
The lifter is equipped with a vacuum reserve tank, designed to maintain vacuum temporarily in
case of a power failure (ie, in battery).
WARNING: Stay clear of any suspended load in the event of a power failure.
Although the lifter is designed to support the load for at least 5 minutes without power, this
depends on many factors, including the condition of the load and the lifter’s vacuum system (see
INTENDED USE: L
OAD
C
HARACTERISTICS
and MAINTENANCE: V
ACUUM
P
AD
M
AINTENANCE
,
V
ACUUM
T
EST
). If a power failure occurs, keep everyone clear of the suspended load until it can safely be
placed on the ground or a stable support. Correct any deficiency before resuming normal
operation of the lifter.
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