Wood’s Powr-Grip MRTA811LDCO - Manual (Page 15)

Rev 0.0/6-14 13 MRTA8-DCO-DVS: #35077
Confirming the Pad Frame Configuration
WARNING: Load capacity of lifter can vary, depending on pad frame
configuration.
Make sure the pad frame has been assembled in the configuration that will provide optimal
support of the load while lifting (see ASSEMBLY: T
O
C
HANGE THE
P
AD
F
RAME
C
ONFIGURATION
). The
pad frame configuration selected must be appropriate, both for the weight and for the
dimensions of the load in question.
T
O
A
PPLY THE
P
ADS TO A
L
OAD
Powering up the Lifter
Make sure the lever on the vacuum control valve is in the center position (see T
O
R
ELEASE THE
P
ADS FROM THE
L
OAD
: About Energy Conservation Mode to follow). Place the power switch in the
ON ( ) position (blue indicator light remains illuminated while power is engaged). 5 The power
switch must remain in the ON position while operating the lifter. 6
WARNING: Never turn power off while operating lifter.
Placing the power switch in the OFF ( ) position during lifter operation could result in the
release of the load and possible injury to the operator (see T
O
L
IFT AND
M
OVE THE
L
OAD
: In Case of
Power Failure to follow).
Positioning the Lifter on the Load
Make certain that the contact surfaces of the load and all vacuum pads are free of any
contaminates that could prevent the pads from sealing against the load (see MAINTENANCE:
V
ACUUM
P
AD
M
AINTENANCE
).
Center the lifter’s pad frame to within 2" [5 cm] of the load center, since off-center loading can
cause the load to tilt or rotate unexpectedly (see T
O
L
IFT AND
M
OVE THE
L
OAD
: About the Tilt
Linkage and T
O
R
OTATE THE
L
OAD
E
DGEWISE
to follow), and it may also damage the lifter. 7 Make
sure that all vacuum pads will fit entirely on the load’s contact surface (see SPECIFICATIONS:
Pad Spread) and that they will be loaded evenly while lifting (see SPECIFICATIONS: Per-Pad Load
Capacity). Then position the lifter on the load so that all pads are touching the contact surface.
5
After the power switch is placed in the ON position, the low vacuum warning light and the vacuum pump turns on until the
lifter attains full vacuum. Since the lifter is operating in energy conservation mode at this stage, the pump and warning light may
subsequently turn off. However, this does
not indicate that the lifter is ready to lift a load.
6
If the vacuum pump fails to function while the power switch is in the ON position, examine the circuit breaker (adjacent to
power switch) to determine whether it has interrupted the electrical circuit to the pump. Although the operator can reset the
circuit breaker, the power interruption may indicate an electrical problem that requires attention. Correct any deficiency before
resuming normal operation of the lifter (see wiring diagram provided).
7
The lifter is designed to handle the maximum load weight (see SPECIFICATIONS: Maximum Load Capacity) when the load’s
center of gravity is positioned within 2" [5 cm] of the pad frame’s center point. Occasional loading deviations are permissible,
provided that the operator can maintain control of the load at all times and that the load weight is low enough to avoid damaging
the lifter.