Woods-powr-grip VLPL411LAC User Manual download pdf (Page 11)

Rev 15.0/12-12 9 VLPL4-AC: #35165

WARNING: Do not disconnect control enclosure during lifter operation.

The electrical cord that is connected to the control enclosure (aka "pendant" on warning label) is

not intended to be disconnected during lifter operation. Disconnecting the control enclosure is

likely to result in a load release and injury to the operator or others nearby.

Reading the Vacuum Gauge

The vacuum gauge indicates the current vacuum level in the lifter’s vacuum system. The

green

range indicates vacuum levels sufficient for lifting the maximum load weight, whereas the

red

range indicates vacuum levels that are

not

sufficient for lifting the maximum load weight. The

gauge needle should show a sudden surge in vacuum as the vacuum pads seal against the load.

If it takes more than 5 seconds for the vacuum level to reach 5" Hg [-17 kPa], press individually

on any activated pad that has not yet sealed.

Vacuum Level on Optimal Surfaces

When the lifter is attached to clean, smooth, nonporous load surfaces, it should be able to

maintain a vacuum level in the green range on the vacuum gauge, except when used at high

elevations (see SPECIFICATIONS: Operating Elevation). If not, perform the VACUUM TEST (see

MAINTENANCE) to determine whether there is a deficiency in the vacuum generating system.

Vacuum Level on Other Surfaces

When the lifter is attached to contaminated, rough or porous load surfaces, it may not be able to

maintain a vacuum level in the green range on the vacuum gauge, due to leakage in the seal

between the vacuum pads and the load surface. In the case of contamination, thoroughly clean

the contact surfaces of the load and the vacuum pads (see MAINTENANCE: VACUUM PAD

MAINTENANCE: Cleaning), and reapply the lifter to the load. If the load has rough or porous

surfaces,

the operator must conduct a test to determine whether the lifter is designed

to lift the load

, as follows:

1) Make sure the lifter's vacuum generating system is functioning correctly (see MAINTENANCE:

VACUUM TEST).

2) Apply the vacuum pads to the load as previously directed.

3) When the vacuum level registers above 16" Hg [-54 kPa] on the vacuum gauge (see TO LIFT

AND MOVE THE LOAD: Load Capacity and the Lift Lights to follow), place the power switch in the

"OFF" position.

4) Raise the load a minimal distance, to assure that it is supported by the lifter.

5) Monitor the vacuum gauge while the load is suspended for 5 minutes:

The lifter must

maintain a minimum vacuum level of 10" Hg [-34 kPa] during this time.

If not, the

load does not possess the characteristics required for using this lifter.

Certain load materials are too rough or porous to allow the lifter to form a seal which can be maintained for 5 minutes without

power. However, in geographical locations where CE Standards do not apply, it may be possible to use the lifter to lift such loads.

Contact Wood’s Powr-Grip for more information.

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Woods-powr-grip VLPL411LAC User Manual Page 11

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