WPG MRTA4LP6FACS User manual

Rev 0.0/5-23 MRTA(4)6LP6FAC: #352591
INTENDED FOR USE BY SKILLED
PROFESSIONALS • READ AND
UNDERSTAND BEFORE OPERATING
OPERATING
INSTRUCTIONS 908 W. Main • P.O. Box 368
Laurel, MT USA 59044
800-548-7341 (phone)
406-628-8231 (phone)
406-628-8354 (fax)
www.WPG.com
Record serial number in blank space above (to locate, see serial
label on the product).
QUADRA-TILT
ROTATOR
WITH ADJUSTABLE PAD FRAME,
AC-VOLTAGE
Model numbers: MRTA4LP6FACS, MRTA6LP6FAC
KEEP FOR FUTURE REFERENCE

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-232

Rev 0.0/5-23 MRTA(4)6LP6FAC: #352591
SPECIFICATIONS .....................................................................................3
SAFETY...................................................................................................5
OPERATING FEATURES............................................................................6
ASSEMBLY..............................................................................................7
INTENDED USE .......................................................................................9
LOAD CHARACTERISTICS.................................................................................9
INDIRECT LOADING .....................................................................................10
OPERATING ENVIRONMENT..........................................................................10
DISPOSAL OF THE LIFTER .............................................................................10
OPERATION..........................................................................................11
BEFORE USING THE LIFTER...........................................................................11
Taking Safety Precautions .................................................................................................11
Performing Inspections and Tests .....................................................................................11
TOPOSITION MOVABLE PAD ARMS ...............................................................12
TOATTACH THE PADS TO ALOAD ..................................................................13
Generating Airflow............................................................................................................13
Positioning the Lifter on the Load.....................................................................................13
Reading the Vacuum Gauge..............................................................................................14
TOLIFT AND MOVE THE LOAD......................................................................15
About the Tilt Linkage .......................................................................................................15
Interpreting the Vacuum Gauge .......................................................................................15
Monitoring the Vacuum Gauge.........................................................................................15
Controlling the Lifter and Load .........................................................................................16
In Case of a Power Failure.................................................................................................16
TOROTATE THE LOAD .................................................................................17
TOTILT THE LOAD ......................................................................................18
TORELEASE THE PADS FROM THE LOAD .........................................................19
AFTER USING THE LIFTER.............................................................................19
Storing the Lifter ...............................................................................................................20
Transporting the Lifter ......................................................................................................20
INSPECTIONS AND TESTS......................................................................21
INSPECTION SCHEDULE ................................................................................21
TABLE OF CONTENTS

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-232
TESTING ...................................................................................................22
Lifter/Load Compatibility Test...........................................................................................22
Operational Tests ..............................................................................................................23
Vacuum Test......................................................................................................................23
Rated Load Test.................................................................................................................24
MAINTENANCE ....................................................................................25
VACUUM PAD MAINTENANCE.......................................................................25
Pad-to-Load Friction Coefficient .......................................................................................25
Pad Inspection ..................................................................................................................25
Pad Cleaning .....................................................................................................................26
REPLACEMENT PARTS...........................................................................27
REGISTRATION AND LIMITED WARRANTY ............................................28
TOREGISTER THIS WPG PRODUCT ...............................................................28
ABOUT THE LIMITED WARRANTY ..................................................................28
Obtaining Warranty Service or Repair Service..................................................................28
TABLE OF CONTENTS

Product
Description
Designed for use with hoisting equipment, MRTA4/6-AC lifters support loads using vacuum and manipu-
late loads using manual 360° rotation and mechanically assisted, manual 90° tilt motions.
Model
Number MRTA4LP6ACS MRTA6LP6FAC
Maximum Load
Capacity1
1...... The Maximum Load Capacity is rated at a vacuum of 16" Hg [-54 kPa] on clean, smooth, nonporous flat surfaces with a friction coefficient of 1. Pad
compound, load rigidity, strength, surface conditions, overhang, angle, center of gravity and temperature can also affect the lifting capacity. A “qualified
person” should evaluate the effective lifting capacity for each use (see definition under “Rated Load Test”).
Per pad: 50 lbs [22.5 kg]
Total: 200 lbs [90 kg]
Per pad: 50 lbs [22.5 kg]
Total: 300 lbs [135 kg]
Vacuum Pads2
2...... Available with other rubber compounds for special purposes (see www.wpg.com).
(standard rubber)
Four 6" [15 cm] nominal diameter, low profile
(Model LP6F)
Six 6" [15 cm] nominal diameter, low profile
(Model LP6F)
Pad Spread (to outer edges)
Length Minimum: 26¾" [68 cm]
Maximum: 41½" [105 cm]
Width Minimum: 15¼" [39 cm]
Maximum: 35½" [90 cm]
Movable
Pad Arms Rotation capability: 210°, with locking every 30°
Lifter
Weight 90 lbs [41 kg]
Power
Source See serial number plate for specific AC voltage, frequency and amperage.
Rotation
Capability Manual, 360°, with automatic locking at each ¼ turn (when required)
Tilt
Capability Manual, 90°, with four-bar tilt linkage that provides mechanical advantage
Product
Options
Available with 2" [5 cm] Pad Spacers
See separate instructions about other options.
Operating
Elevation Up to 6,000' [1,828 m]
Operating
Temperatures 32° — 104° F [0° — 40° C]
Service
Life 20,000 lifting cycles, when used and maintained as intended3
3...... Vacuum pads, filter elements and other wear-out items are excluded.
ASME Standard
BTH-1 Design Category "B", Service Class "0"
Troubleshooting
Guide4
4...... To view this guide, click the link at right. Additionally, you can search for your lifter's Model Number at www.wpg.com and select the “Troubleshooting” link
on the product page.
TST-016_GENERIC_LEAK_TEST_rev_2014-086
Rev 0.0/5-23 MRTA(4)6LP6FAC: #352593
SPECIFICATIONS

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-234
Note: A standard MRTA6LP6FAC is shown.
SPECIFICATIONS

Rev 0.0/5-23 MRTA(4)6LP6FAC: #352595
SAFETY
Wear personal protective equipment
that is appropriate for the load
material. Follow trade association
guidelines.
Do not remove or obscure safety
labels.
Do not make any modifications to the
lifter (see “LIMITED WARRANTY”).
Use the lifter only in an approved
“OPERATING ENVIRONMENT” (see
“INTENDED USE”).
Make sure to consider all possible
effects of “INDIRECT LOADING” on lifting
capacity (see “INTENDED USE”).
Do not use a lifter that is damaged,
malfunctioning, or missing parts.
Do not use a lifter if the sealing edge
of any vacuum pad is cut or otherwise
damaged.
Do not use a lifter to lift cracked or
broken glass.
Do not exceed the Maximum
Load Capacity or lift loads the
lifter is not designed for (see
“INTENDED USE”).
Do not use a lifter if the
Maximum Load Capacity or any
safety label appears to be
missing or obscured.
Make sure the contact surfaces of the
load and vacuum pads are clean
before attaching the lifter (see
“MAINTENANCE”).
Position the vacuum pads correctly on
the load before lifting (see
“OPERATION”).
Do not lift a load if any vacuum
indicator shows inadequate vacuum.
Keep unauthorized personnel away
from the lifter, to avoid injury in case
of an unintended load release.
Do not touch the vacuum release
controls during a lift.
Do not allow people to ride on the
lifter or the load.
Do not lift a load higher than
necessary or leave suspended loads
unattended.
Do not position a loaded or unloaded
lifter over people.
Before servicing a powered lifter, place
the power control in the inactive
position and, when possible,
disconnect the power source.

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-236
Features shown here are underlined on their first appearance in each section following.
1 LIFT POINT 2 POWER SWITCH
3 VACUUM PAD 4 AIR FILTER
5 MOVABLE PAD ARM 6 PAD ARM RELEASE
7 PAD ARM LIMIT DISK 8 CONTROL HANDLES
9 VACUUM RELEASE BUTTON 10 VACUUM GAUGE
11 VACUUM PUMP 12 ROTATION RELEASE LEVER
13 PAD FRAME 14 LIFT BAR
Note: A standard MRTA6LP6FAC is shown. Although some of the following photos do not show
this specific lifter, they all illustrate how this kind of lifter functions.
For information about specific parts, see “REPLACEMENT PARTS” and/or any separate
instructions for Product Options.
OPERATING FEATURES

Rev 0.0/5-23 MRTA(4)6LP6FAC: #352597
ASSEMBLY
1) Remove all shipping materials and save them with the shipping container for future use.
2)
Make sure power source has ground fault circuit
interrupter.
Connect the power cable:
2.1)
Wiring must be performed by
qualified service personnel, taking
all appropriate safety precautions.
Wire the female connector provided
to an appropriate power source, as
indicated on the label attached.
2.2) Route the power cable so that it does not become damaged during operation.
2.3)
2A 2B
Insert the power cable’s male
connector into the female connector
and twist to secure them together
(figs. 2A-B).
3) Suspend the lifter from appropriate hoisting equipment:
3.1)
Select a crane and/or hoist rated for the Maximum Load Capacity plus
the Lifter Weight.
Note: Any lifter use must comply with all statutory or regulatory standards for
hoisting equipment in your region.
3.2)
3A 3B 3C
Attach the hoisting hook to
the lift point (figs. 3A-B).
Make sure hook
has restraining
latch (see arrow in fig.
3B).
Only use rigging rated for Maximum
Load Capacity plus Lifter Weight.
Note: Use rigging (fig. 3C) as
needed to make sure the hook does
not interfere with the load.
3.3) Use the hoisting equipment to remove the lifter from the shipping container. Avoid
damaging the vacuum pads.

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-238
4)
4A
Remove the pad covers (fig. 4A) and save them for
future use.
5) Perform tests as required under “TESTING”.
ASSEMBLY

Rev 0.0/5-23 MRTA(4)6LP6FAC: #352599
INTENDED USE
LOAD CHARACTERISTICS
Do NOT lift explosives, radioactive
substances or other hazardous materials.
Make sure the vacuum lifter is intended
to handle each load according to these
requirements:
• The load weight must not exceed the Maximum Load Capacity.
• The load must be a single piece of relatively nonporous material with a flat and
relatively smooth contact surface.1, 2To determine whether the load is too porous or
rough, perform the “Lifter/Load Compatibility Test”.
• The load's contact surface must be able to obtain a friction coefficient of 1 with the lifter's
vacuum pads (see “Pad-to-Load Friction Coefficient”). Otherwise, the capacity should be
derated appropriately.
• The load's surface temperature must not exceed the Operating Temperatures.3
• The load's minimum length and width are determined by the current Pad Spread
(see “SPECIFICATIONS”).
• The load's maximum length and width are determined by its allowable overhang.4
• 1½" [3.8 cm] is the allowable thickness at Maximum Load Capacity.5The load must
be positioned correctly on the lifter (see “OPERATION”). If not, the allowable load
thickness would be reduced.6
Note: Standard vacuum pads can stain or deform load surfaces with light colors or soft coatings.
Test such surfaces for damaging effects before using the lifter on them.7
1..... Although concave vacuum pads can also attach to some curved loads, curvature can reduce lifting capacity. Contact WPG for more information.
2..... A “single piece” of material includes curtainwall assemblies, unitized glazing systems and similar construction units.
3..... Vacuum pads made from a heat-resistant rubber compound can enable you to lift loads with higher surface temperatures. Contact WPG or an
authorized dealer for more information.
4..... The allowable overhang is the amount of load material that can extend sideways beyond the vacuum pad without breaking or otherwise being
damaged. This depends on the load material, its thickness, and the angle of handling (if any). Since every material has different physical
properties, the allowable overhang must be evaluated separately for each load type. Contact WPG or an authorized dealer for more
information.
5..... However, the allowable thickness increases as load weight decreases. Contact WPG for more information.
6..... Pad Spacers can reduce the stability of upright loads and allowable load thickness. Contact WPG for more information.
7..... Alternative rubber compounds are available for these purposes. Contact WPG or an authorized dealer for more information.

Indirect loading
can reduce
lifting capacity.
MRTA(4)6LP6FAC: #35259 Rev 0.0/5-2310
INDIRECT LOADING
Make sure to account for dynamic loading or other inadvertent
loading that can negatively affect lifting capacity, such as:
• Weight amplification that results when a loaded vacuum lifter
abruptly starts/stops moving, changes direction or bounces up
and down (eg, when a telehandler transports a loaded lifter across rough terrain).
• External force that effectively increases the weight of a lifter’s attached load (eg, when a
load of sheet material reacts to wind gusts).
OPERATING ENVIRONMENT
Make sure the lifter is suitable for each work environment, given the following restrictions:
•
Never use lifter
in dangerous
environments.
This lifter is not intended for any environment that is
dangerous to the operator or damaging to the lifter. Avoid
environments containing explosives, caustic chemicals and
other dangerous substances.
Metal particles and similar environmental contaminants could result in
vacuum pump failure.
• The work environment is limited by the Operating Elevation and Operating
Temperatures.1, 2
• The lifter is not designed to be watertight.
Moisture can reduce
lifting capacity.
Do not use it in
rain or other unsuitable conditions.
CE/UKCA — A secondary positive holding device is required to lift loads on construction sites.
DISPOSAL OF THE LIFTER
After the Service Life of the lifter has ended (see “SPECIFICATIONS”), dispose of it in compliance
with all local codes and applicable regulatory standards.
1..... Although lifter use may be possible at higher elevation, lifting capacity is reduced whenever the lifter is unable to attain vacuum in the green
range on the vacuum gauge. Contact WPG for more information.
2..... Special provisions may allow the lifter to operate outside the specified temperature range. Contact WPG for more information.
INTENDED USE

Rev 0.0/5-23 MRTA(4)6LP6FAC: #3525911
OPERATION
BEFORE USING THE LIFTER
Determine whether the vacuum lifter is capable of each intended task (see “SPECIFICATIONS”
and “INTENDED USE”). Then complete the following preparations:
Taking Safety Precautions
•
Read all directions and safety rules before using
lifter.
Always wear appropriate personal protective
equipment.
Be trained in all industry
and regulatory standards
for lifter operation in your
region.
• Follow trade association
guidelines about precautions needed for each load material.
Performing Inspections and Tests
• Follow the “INSPECTION SCHEDULE”and “TESTING”.
•
Examine air filter regularly
and service when needed.
Examine the air filter and perform service
whenever its bowl contains liquid or other
contaminates or its element appears dirty (see
“AIR FILTER MAINTENANCE” in SERVICE MANUAL).1
1..... Lifters used on wet load surfaces must be equipped with 2 or more filters connected in series. See “OPERATING ENVIRONMENT”for restrictions.

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-2312
TOPOSITION MOVABLE PAD ARMS
Position the movable pad arms to maximize load support and minimize load overhang (see
“LOAD CHARACTERISTICS”):
1)
1A
Pull and hold the pad arm release (arrow in fig. 1A
inset), to disengage the arm.
2)
2A
Rotate the arm to the
desired position (fig. 2A).
Then let go of the pad arm
release.
3) Continue rotating the arm until it engages at the next stop on the pad arm limit disk.
4) Repeat steps 1-3 with other pad arms as needed.
OPERATION

Rev 0.0/5-23 MRTA(4)6LP6FAC: #3525913
TOATTACH THE PADS TO ALOAD
Generating Airflow
1A
Place the power switch in the “on” position (fig. 1A), to engage the
vacuum pump.
Keep pump
running
throughout lift.
The lifter is designed for the vacuum pump to run continuously. Placing
the power switch in the “off” position during lifter operation could result
in a load release and personal injury (see “In Case of a Power Failure” on
page 16).
Positioning the Lifter on the Load
1)
1B
Make sure the contact surfaces of the load and vacuum pads
are clean (fig. 1B; see “Pad Cleaning”).
2) Make sure movable pad arms are positioned as desired (see “TOPOSITION MOVABLE PAD
ARMS”).
3)
2B
Center the pad frame on the load (fig. 2B).1
1..... The lifter is designed to handle the maximum load weight when the load’s center of gravity is positioned within 2" [5 cm] of the pad frame’s
center point. Uncentered loads may rotate or tilt unexpectedly.
OPERATION

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-2314
4)
4B
Make sure all vacuum pads will fit on
the load and will be loaded evenly
(fig. 4B).
Consult the Per-Pad Load
Capacity.
5) Place the pads in contact with the
load surface until they begin to seal.1
Reading the Vacuum Gauge
A vacuum gauge shows the current vacuum level in positive inches of Hg and negative kPa:
•
1A 2A
Green range (>16" Hg [-54 kPa]):
Vacuum level is sufficient to lift the
maximum load weight (fig. 1A).
• Red range (<16" Hg [-54 kPa]):
Vacuum level is not sufficient to lift
the maximum load weight (fig. 2A).
If it takes more than 5 seconds for the vacuum level to reach 5" Hg [-17 kPa], press on any
vacuum pad that has not yet sealed.
Once the pads have sealed, the lifter should be able to maintain sufficient vacuum for lifting,
except when used above the maximum Operating Elevation.2If it does not, perform the
“Vacuum Test”.
1..... Although a vacuum pad may become distorted during shipping or storage, this condition should correct itself with continued use.
2..... If the lifter is used above the maximum Operating Elevation (see “SPECIFICATIONS” on page 3), it may not be able to maintain sufficient vacuum
for lifting. Contact WPG for more information.
OPERATION

Rev 0.0/5-23 MRTA(4)6LP6FAC: #3525915
TOLIFT AND MOVE THE LOAD
Lift bar must be vertical to lift
load.
About the Tilt Linkage
Unbalanced loads may tilt
unexpectedly during lifter operation.
Make sure load is positioned
correctly on lifter.
The tilt linkage minimizes operator effort and
automatically holds a balanced load in either
the upright or the flat position. However, an
unbalanced load may tilt unexpectedly,
resulting in load damage or personal injury.
To minimize these risks, make certain before lifting any load that it has appropriate “LOAD
CHARACTERISTICS”and is attached to the vacuum lifter as previously directed.
Interpreting the Vacuum Gauge
Never lift load unless vacuum gauge
registers in the green range, because
premature lifting could result in load
release and personal injury.
Vacuum is sufficient to lift the Maximum
Load Capacity whenever the vacuum
gauge registers in the green range.
Monitoring the Vacuum Gauge
1B
Monitor the vacuum gauge (fig. 1B) throughout the entire lift.
Make sure the vacuum gauge remains completely
visible.
The vacuum pump runs continuously to maintain sufficient
vacuum for lifting the maximum load weight.
However, if the vacuum gauge shows a level less than 16" Hg
[-54 kPa]:
1)
Stay clear of any suspended load
while gauge warns of low vacuum.
Keep everyone away from a suspended
load until it can be safely lowered to a
stable support.
2) Stop using the lifter until the cause of the vacuum loss can be identified: Conduct the
“Pad Inspection” and perform the “Vacuum Test”.
3) Correct any faults before resuming normal operation of the lifter.
OPERATION

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-2316
Controlling the Lifter and Load
1A
When the lifter is ready, use the
hoisting equipment to raise the
lifter and load as needed.
Use a control handle (circled in fig.
1A) to keep the lifter and load in
the required position.
Once there is enough clearance,
you may move the load as
required.
In Case 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 “LOAD CHARACTERISTICS”and the condition of the vacuum
pads (see “VACUUM PAD MAINTENANCE”).
Stay clear of any suspended
load during power failure.
If a power failure occurs, keep everyone away from a
suspended load until it can be safely lowered to a stable
support. Correct any faults before resuming normal
operation of the lifter.
OPERATION

Rev 0.0/5-23 MRTA(4)6LP6FAC: #3525917
TOROTATE THE LOAD
Make sure load is positioned correctly on
lifter (as previously directed).
1) Make sure the load has enough clearance to rotate without contacting anyone or
anything.
2)
Unbalanced loads may rotate unexpectedly when
rotation latch is disengaged.
Use a control handle to
keep the load under
control at all times.
3)
3A 3B
Pull and hold the
rotation release lever
(figs. 3A-B) to disengage
the rotation latch.
4)
4A
4B
Rotate the load
as required
(figs. 4A-B).
To stop load
motion, let go
of the rotation
release lever
and guide the
load to the next
appropriate
stop.
Note: Whenever
rotation is not
required, keep the
rotation latch
engaged, to prevent
load damage or
personal injury.
OPERATION

MRTA(4)6LP6FAC: #35259 Rev 0.0/5-2318
TOTILT THE LOAD
Keep hands and fingers away
from tilt linkage.
1) Make sure the load has enough clearance to tilt without contacting anyone or anything.
2) Use the control handles to keep the load under control at all times.
3A 3B
3) Lift upward or press downward on the tilt control handle (arrows in figs. 3A-B) to tilt the
load as desired.1
Note: See “LOAD CHARACTERISTICS”about allowable load overhang.
4C
A load with overhang may force you to
release the control handle as the load
approaches the flat position. In this
case, use hand cups (circled in fig. 4C) or
other appropriate means to control the
load.
1..... Due to the tilt linkage design, load force on the control handle changes direction during the tilt.
OPERATION