WPG 93780AM User manual

KEEP FOR FUTURE REFERENCE
INSTRUCTIONS
International Version
STOCK NUMBERS: 93780AM & 93780BM
VACUUM LOSS WARNING BUZZER
READ ALL INSTRUCTIONS AND WARNINGS
BEFORE USING THIS PRODUCT
DESIGNED FOR THE MATERIALS HANDLING PROFESSIONAL
P.O. Box 368 –908 West Main
Laurel, MT USA 59044
phone [phone]
phone [phone]
fax [phone]

Rev 10.0/2-17 1 #35193AFT
SPECIFICATIONS
Stock Number:
93780AM & 93780BM
Description:
The Vacuum Loss Warning Buzzer is an optional warning device with an independent
power source. The Warning Buzzer monitors vacuum during lifter operation and
sounds an audible alarm if the lifter fails to reach or maintain the vacuum level
required for lifting. The monitoring system automatically turns on when the lifter
attaches to a load, and automatically turns off when the load is released.
Power Source:
9 volts DC
Maximum Alarm Volume: 103 dBA at 2 ft [60 cm]
Weight:
1.1 lbs [0.5 kg]
Note: Make sure to add the weight of all options to the lifter weight when you are
selecting appropriate hoisting equipment (see lifter's instruction manual).
Operating Temperatures: 50° to 104° F [10° to 40° C]
Function:
Other vacuum indicators should tell the operator whether vacuum is adequate for
lifting. The Warning Buzzer provides additional security by drawing attention to
potentially dangerous conditions, in case the operator fails to monitor other indicators
at the time.
Note: The Warning Buzzer only warns the operator of potentially dangerous
conditions. The Warning Buzzer does not perform any other function and cannot
substitute for care on the part of the operator.
Wiring Diagram:
One or more wiring diagrams are provided in the final section of this INSTRUCTIONS
manual for reference in servicing the Warning Buzzer or trouble-shooting a deficiency.
WARNINGS
Powr-Grip is pleased to offer the most reliable vacuum products available.
Despite the high degree of security provided by the Warning Buzzer, certain
precautions must be observed to protect the operator and others.
Never use a Vacuum Loss Warning Buzzer that is damaged, malfunctioning, or missing parts.
Always make sure the Warning Buzzer can be heard while operating the vacuum lifter.
Never lift a load when the Warning Buzzer or any other vacuum indicator signals inadequate
vacuum.
Never disconnect or otherwise disable the Warning Buzzer while operating the lifter.
Always keep other personnel far enough away from the lifter to avoid injury in the event of an
unexpected load release.
Always remember that modifications to the Warning Buzzer may compromise its safety. Wood's
Powr-Grip cannot be responsible for the safety of a Warning Buzzer that has been modified by
the customer. For consultation, contact Wood's Powr-Grip (see LIMITED WARRANTY).

Rev 10.0/2-17 2 #35193AFT
OPERATING FEATURES
Note: Components featured in the following instructions for installing, using or maintaining the
Vacuum Loss Warning Buzzer are underlined on their first appearance in each section.
1 VACUUM HOSE FITTING
2 BATTERY HOLDER
4 BATTERY TEST BUTTON
CONNECTING TO IN-LINE FILTER
3 BATTERY INDICATOR LIGHT
5 ALARM SHUTTER

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INSTALLATION
1) Remove the Vacuum Loss Warning Buzzer from its protective packaging.
2) Follow the vacuum lifter's instruction manual to verify that it is in good working order before
installing the Warning Buzzer.
3) Locate a place on the lifter where the Warning Buzzer can be mounted without interfering
with the function or operation of the lifter.
4) Remove the cover of the Warning Buzzer to access the mounting screw holes.
5) Mount the Warning Buzzer on the lifter with four 10-32 screws. Note: It may be necessary
to attach a mounting plate to the lifter; consult the lifter manufacturer for appropriate
locations and allowable modifications.
6) Locate a section of the vacuum hose which always has vacuum when the lifter is attached
to a load. Such a section often can be found near the lifter’s air filter, between the filter
and pads. The vacuum hose in this location must have enough flexibility and space to allow
a new fitting to be spliced into the line.
7) Cut the vacuum hose and insert the 1/4" x 1/8" x 1/4" tee fitting supplied (or another fitting
of appropriate size) to splice the vacuum hose together and to provide a 1/8" barb for a
hose connecting to the Warning Buzzer.
8) Route 1/8" I.D. vacuum hose from the tee fitting to the Warning Buzzer. Make sure that
the hose will not become kinked, pinched, cut, abraded, pulled or snagged while using the
lifter, nor interfere with its operation.
9) Connect one end of the 1/8" I.D. vacuum hose to the tee fitting and the other end to the in-
line filter connected to the vacuum hose fitting on the cover of the Warning Buzzer.
10) Test the vacuum setting as directed under MAINTENANCE: VACUUM SETTING ADJUSTMENT, and
if necessary, adjust the setting as directed.
11) Reinstall the enclosure cover.
12) Test the Warning Buzzer as directed under MAINTENANCE: TESTING SCHEDULE.

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OPERATION
BEFORE USING THE LIFTER
All of the following preparations must be completed prior to operating a vacuum lifter with the
Vacuum Loss Warning Buzzer installed. The operator must read and understand this
INSTRUCTIONS manual, including all WARNINGS . If necessary, contact Wood’s Powr-Grip or
an authorized dealer for assistance.
Perform all inspections and tests required by the INSPECTION and TESTING SCHEDULES (see
MAINTENANCE). Test the strength of the Warning Buzzer’s battery, as directed in BATTERY TEST
AND REPLACEMENT (see MAINTENANCE).
WARNING: Make sure alarm is clearly audible over ambient noise at operator
position.
The volume of the alarm may be adjusted by rotating the alarm shutter on the Warning Buzzer's
cover. Make sure the alarm is loud enough to be heard over any other noise that may be present
while the lifter is in use: In addition, the alarm must be clearly audible at the maximum distance
the operator may be from the lifter, as well as through any barriers or obstructions between the
operator and the lifter. In order to be considered clearly audible, the alarm volume must
exceed ambient noise by at least 15 dBA at the operator position.
1
Since the Maximum
Alarm Volume is 103 dBA, ambient noise must not exceed 88 dBA under any circumstances.
Furthermore, if ambient noise measures 88 dBA, the alarm volume must be set to maximum and
the operator must remain within 2 ft [60 cm] of the Warning Buzzer, in order for it to be
effective.
Note: Using the Warning Buzzer in wet environments may require the operator to take special
precautions: Although the Warning Buzzer's exterior surfaces can tolerate some exposure to
water vapor, they are not designed to be water-tight. Submerging the Warning Buzzer or using
it in rain may damage its components; these and similar conditions must be avoided.
1
Consult CE Standard EN 457 for alternative ways to determine whether the alarm is clearly audible to operators.

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DURING LIFTER OPERATION
Using the Vacuum Loss Warning Buzzer does not supersede any safety practices required by the
lifter’s manufacturer. The operator must continue to respect all cautionary statements in the
lifter instructions, even after the Warning Buzzer is installed.
WARNING: Warning Buzzer does NOT supersede required safety practices.
Operate the vacuum lifter as directed in its operating instructions. The Warning Buzzer begins
monitoring the lifter’s vacuum level when the lifter attaches to a load. If the lifter fails to reach
or maintain sufficient vacuum to lift the maximum load weight (see lifter specifications), the
Warning Buzzer sounds an alarm. If the lifter subsequently attains this vacuum level, the alarm
stops sounding.
WARNING: Do not attempt to lift load if alarm is sounding.
If the alarm is sounding, do not attempt to lift the load; such an attempt could result in a load
release and possible injury to the operator.
If the alarm sounds while you are lifting a load, make sure the lifter's vacuum gauge shows the
minimum lifting level or higher, as defined in the lifter's operating instructions. 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
lifter’s operating instructions 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.
Note: Under normal circumstances, the alarm does not sound while the lifter is being attached to
the load; however, the alarm does sound briefly while the load is being released in the regular
way. This sound is normal for a Warning Buzzer that is working correctly; it simply indicates the
loss of vacuum that occurs when the load is being released.
While the lifter is attached to a load, the battery indicator light automatically signals the condition
of the Warning Buzzer’s battery: A green light indicates that the battery is in good condition,
whereas a red light indicates that the battery needs to be replaced. If a red light is showing,
replace the battery as directed in BATTERY TEST AND REPLACEMENT to follow.
WHEN STORING THE LIFTER
When placing the lifter in storage, remove the Warning Buzzer’s battery (see BATTERY TEST AND
REPLACEMENT to follow).

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MAINTENANCE
INSPECTION SCHEDULE
Perform inspections of the Vacuum Loss Warning Buzzer routinely, according to the following
frequency schedule:
Frequent Inspection
( following every 20-40 hours’ use; or whenever Warning Buzzer is out of service for 1 month or more )
• Test the battery strength (see BATTERY TEST to follow)
• Examine the in-line filter connected to the Warning Buzzer to make sure its desiccant has not
been expended: The desiccant shows a blue coloration when new and turns progressively
more pink as it absorbs moisture. When the desiccant is no longer effective, the filter must
be replaced (see REPLACEMENT PARTS LIST).
• Test the Warning Buzzer for proper function (see OPERATION).
If any deficiency is detected during the inspection, correct it before using the Warning Buzzer,
and perform the Periodic Inspection to follow.
Periodic Inspection
( following every 250-500 hours’ use; or whenever Warning Buzzer is out of service for 1 year or more )
• Test the vacuum setting (see VACUUM SETTING ADJUSTMENT to follow).
• Keep a written record of all Periodic Inspections.
If any deficiency is detected during the inspection, adjust the vacuum setting as directed under
VACUUM SETTING ADJUSTMENT to follow.
Infrequent Use
If the Warning Buzzer is used less than 1 day in a 2-week period, perform the Periodic Inspection
each time before using the Warning Buzzer .

Rev 10.0/2-17 7 #35193AFT
TESTING SCHEDULE
Perform these tests when installing the Vacuum Loss Warning Buzzer initially and each time
following a repair or modification . Correct any deficiency and retest before using the Warning
Buzzer.
• Perform a vacuum leak test as directed in the lifter's instruction manual.
• Test all features and functions of the Warning Buzzer (see OPERATING FEATURES, OPERATION
and MAINTENANCE).
Note: See MAINTENANCE topics to follow for additional directions about inspecting and testing
specific Warning Buzzer components.
MAINTENANCE SCHEDULE
Although the Vacuum Loss Warning Buzzer does not require maintenance on a routine basis,
maintenance must be performed whenever a deficiency is indicated by routine inspections or
tests. Any maintenance warranted must be performed before resuming normal use of the
Warning Buzzer.
BATTERY TEST AND REPLACEMENT
The Vacuum Loss Warning Buzzer is designed so its battery can be tested while the lifter is not
running or attached to a load: Press the battery test button and observe the color of the battery
indicator light (note that the buzzer sounds, also, if the button is held more than a few seconds).
A green light indicates that the battery is in good condition, whereas a red light indicates that the
battery does not have sufficient energy to power the Warning Buzzer. If a red light is showing,
replace the battery, as follows:
1) Insert a coin or screwdriver in the slot at the bottom of the battery holder and press inward.
2) While continuing to press in, press up on the battery holder. The battery tray should slide out
easily.
3) Remove the battery from the tray.
4) Install a new 9-volt battery, matching the polarity marked on the battery with the polarity
marked on the tray.
5) Slide the battery tray into the battery holder until the tray snaps into place.
6) Retest the Warning Buzzer.

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VACUUM SETTING ADJUSTMENT
Function and Conditions Requiring Adjustment
If the Vacuum Loss Warning Buzzer is functioning normally, its monitoring system is activated at
a low vacuum level, which is attained as the lifter attaches to a load. Vacuum should continue to
increase until it reaches the level required for lifting the maximum load weight (hereafter, the
“minimum lifting level”), as indicated in the lifter’s operating instructions. If vacuum fails to
increase steadily toward the minimum lifting level, the alarm sounds until a strong trend of
increasing vacuum resumes. Additionally, if vacuum reaches the minimum lifting level and
subsequently falls below it, the alarm sounds until vacuum starts a strong increasing trend again.
The monitoring system shuts off only when vacuum falls below the initial activation level, which
normally happens as the load is released. If the Warning Buzzer fails to function in these ways, it
requires adjustment or repair.
Adjustment Procedure
1) Remove the screws that secure the enclosure cover, and slide the circuit board assembly
outward, in order to access the adjustment screws.
2) Make sure both adjustment screws are turned to the
maximum counter-clockwise position of their range
(about 3/4’s turn), prior to making any adjustments.
3) Apply the lifter to an appropriate test surface (see
lifter’s operating instructions).
4) While the lifter’s vacuum generating system is
activated, slowly turn adjustment screw #1 in the
clockwise direction (about 1/4 turn) until the
Warning Buzzer functions as described in the
preceding discussion. To make sure the alarm sounds
immediately after vacuum falls below the minimum lifting level, create a controlled leak and
observe the Warning Buzzer activity in relation to the vacuum level registered on the vacuum
gauge.
Note: Turn the adjustment screw gently, since downward pressure can affect the accuracy of
the set point; it may require several attempts to complete the adjustment correctly.
5) Release and reapply the lifter to the test surface several times, to verify that the buzzer is
functioning correctly.
ADJUSTMENT SCREWS #1 & #2

Rev 10.0/2-17 9 #35193AFT
REPLACEMENT PARTS LIST
Stock No.
Description
Qty.
65438
1/8" ID Vacuum Hose
1
64752
Audio Alarm - 5-15 V DC - Panel Mount
1
64691
9-Volt Alkaline Battery
1
64200
Push-Button Test Switch
1
56496AM
Circuit Board Assembly
1
53126
1/4" x 1/8" x 1/4" Barbed Brass Tee Fitting
1
16101AM
In-Line Filter
1
15210
1/8" Barbed Nylon Tee Fitting
1
SERVICE ONLY WITH IDENTICAL REPLACEMENT PARTS
SUPPLIED BY OR APPROVED BY WOOD'S POWR-GRIP CO., INC.

Rev 10.0/2-17 10 #35193AFT
LIMITED WARRANTY
Powr-Grip products are carefully constructed, thoroughly inspected at various stages of
production, and individually tested. They are warranted to be free from defects in workmanship
and materials for a period of one year from the date of purchase.
If a problem develops during the warranty period, follow the instructions hereafter to obtain
warranty service. If inspection shows that the problem is due to defective workmanship or
materials, Powr-Grip will repair the product without charge.
WARRANTY DOES NOT APPLY WHEN:
Modifications have been made to the product after leaving the factory.
Rubber portions have been cut or scratched during use.
Repairs are required due to abnormal wear and tear.
The product has been damaged, misused, or neglected.
If a problem is not covered under warranty, Powr-Grip will notify the customer of costs prior to
repair. If the customer agrees to pay all repair costs and to receive the repaired product on a
C.O.D. basis, Powr-Grip then will proceed with repairs.
Wood's Powr-Grip Co., Inc.
908 West Main St. / P.O. Box 368
Laurel, MT USA 59044
phone [phone]
phone [phone]
fax [phone]
TO OBTAIN REPAIRS OR WARRANTY SERVICE
For purchases in North America :
Contact the Technical Service Department at Wood’s Powr-Grip Co. When factory service
is required, ship the complete product--prepaid--along with your name, address and
phone number to the street address hereafter.
For purchases in all other localities :
Contact your dealer or the Technical Service Department at Wood’s Powr-Grip Co. for
assistance.

Rev 10.0/2-17 11 #35193AFT

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