Woods MRTA611LDC Instructions Manual page 29

LOW VACUUM WARNING BUZZER
S
PECIFICATIONS
Maximum Alarm Volume: 103 dBa at 2' [60 cm]
Function: While the lifter is powered up, an audible alarm warns the operator whenever
vacuum is not sufficient for lifting the maximum load weight.
O
PERATION
Before Using the Lifter
WARNING: Make sure alarm is clearly audible over ambient noise at operator
The volume of the alarm may be adjusted by rotating the shutter of the low vacuum warning
buzzer. 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,
volume must exceed ambient noise by at least 15 dBa at the operator position.
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' [60 cm] of the warning buzzer, in order for
it to be effective.
During Lifter Operation
Using the low vacuum warning buzzer requires minimal interaction from the operator. Operate
the vacuum lifter as directed in the OPERATION section of the main instructions. When the valve
handle is placed in the "APPLY" position (power on)
the lifter attains sufficient vacuum to lift the maximum load weight (see SPECIFICATIONS: Load
Capacity in main instructions). 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 possible injury to the operator.
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Consult CE Standard EN 457 for alternative ways to determine whether the alarm is clearly audible to operators.
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Some lifters may be equipped with a power switch to control electrical power, instead of a valve handle.
Rev 2.1/8-06
position.
APPENDIX • LOW VACUUM WARNING BUZZER
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, the warning buzzer sounds an alarm until
the alarm
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