Poweramp PR SERIES HYDRAULIC 4.2009 Manuel d'utilisateur télécharger pdf (Page 23)

OPERATION

4111-0001 — Oct.2007

The PR dock leveler uses hydraulic logic and

one-button operation for ease of use.

The dock leveler can be operated remotely using the

RAISE button (J) on the control panel or operated

locally using the dual-lanyard pull ring (F) located in a

recess at the rear of the platform.

Platform (B) is raised by pushing and holding the

RAISE button (J) or lightly pulling and holding the

dual-lanyard pull ring (F). This activates an electric

motor (D) which, in turn, drives a hydraulic pump. The

hydraulic pump forces oil into the platform cylinder(s)

(H), causing the platform to rise. Releasing the

RAISE button (or pull ring) allows the platform to

lower.

When the platform rises to the point where there is

1 — 3 in. (25.4 — 76.2 mm) of travel left in the platform

cylinder, a cable (P) pulls valve lever (L) down. When

the cable force exceeds the force necessary to shift

the spool valve inside logic block (G), the spool shifts,

causing oil to be redirected to the lip cylinder(s) (C).

This causes the platform to stop rising and lip (A) to

extend. When the lip has fully extended, the platform

will continue to rise until it reaches the full raised

position.

Theory

The dual lanyard feature provides dual function

operation. One function raises the platform. The other

function extends the lip.

Lightly pulling dual-lanyard pull ring (F) lifts dual

lanyard lever (M), causing the contacts of dual

lanyard switch (N) to close. The closed contacts

activates electric motor (D) which causes the

platform to rise (operation is the same as when using

the RAISE button).

Releasing pull ring (F) causes lever (M) to open the

dual-lanyard switch contacts, which de-activates the

electric motor and allows the platform to lower.

When pull ring (F) is firmly pulled, the pull-ring cable

lifts lever (M), which in turn, pushes lever (L) down,

thus causing the spool valve in logic block (G) to

shift. When this happens, oil is redirected to the lip

cylinder(s), causing the platform to stop rising and

the lip to extend. This function can be used to put the

platform at the full below-dock position without fully

raising the platform.

NOTE: The ARTD switch (K) (if equipped) must be in

the OFF position for the platform to stay at

the below-dock position.

* Some models are equipped with multiple cylinders.

A — Lip

B — Platform

C — Lip Cylinder(s)*

D — Electric Motor

E — Inspection Plate

F — Dual-Lanyard Pull Ring

G — Logic Block

H — Platform Cylinder(s)*

J — Raise Button

K— ARTD Switch

L — Valve Lever

M — Dual Lanyard Lever

N — Dual Lanyard Switch

P — Cable

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 55 56

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Poweramp PR SERIES HYDRAULIC 4.2009 Manuel d'utilisateur Page 23

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