Project 2000 ProBedLifting - 5.3 Mechanical Encoder System; 5.3.1 Encoder Assembly and Wiring

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5.3 MECHANICAL ENCODER

CIRCUIT BOARD CONNECTION

The circuit board is a controlling device equipped with:

12Vdc power, 25A max ;

Working contact

12Vdc, 25 A max motor output with polarity control

(C-1) PICTURE 1 – FASTON CONNECTOR, CONTACTS, SIDE VIEW

- Power

DC CURRENT VOLTAGE (nominal) 12Vdc

TOLERANCE: – 10% / + 20% (* note)

DC CURRENT VOLTAGE (MIN÷MAX): 10,8 ÷ 14,4 Vdc

(*note) The value indicated takes into account average motor features and estimated work load. The value indicated here is the mini-

mum value guaranteed for the system to work at maximum declared load.

With reference to picture 1, voltage must be applied to clamps 4 and 8 of the 8-pole faston connector, making sure to connect the

positive pole with the clamp and the ground to clamp 4.

5.3.1 ASSEMBLING AND HARNESSING PROCEDURE FOR THE ENCODER UNIT

Standard motor rotation (the belt shaft rotates in the direction shown by the arrow printed on the black plastic cover)

Connect the ORANGE wires to the “Down” end of stroke of the mechanical encoder and connect the YELLOW wires to the “Up”

end of stroke.

Reverse motor rotation (the belt shaft rotates in the opposite direction shown by the arrow printed on the black plastic cover)

In the control panel, invert the orange wire and the yellow wire.

Connect the YELLOW wires to the “Down” end of stroke of the mechanical encoder and connect the ORANGE wires to the “Up”

end of stroke.

1) While preparing the bed after preloading the belt by turning it twice around the shaft (and therefore after more or less setting the

lowest position for the bed), place the mechanical encoder bracket and insert the threaded sleeve into the shaft. Check the shaft rota-

tion when the bed is descending and consequently in which direction the anti-rotation tab is moving, place the end of stroke button

on the “mechanical encoder” bracket on the side on which the “anti-rotation” tab is moving when the bed is descending and fasten it

by tightening the 3 mm nut. Make sure that the sleeve on the shaft is fastened in the correct position and the “anti-rotation tab” has

enough room inside of the encoder bracket slot to slide throughout the whole ascent of the bed and that the ring nut on the bolt has

enough threading left to cover the bed ascent distance.

2) Move the bed upwards for a few centimetres lower the bed and check the exact stop position: if it does not match the desired

position, loosen the 14 mm bolt fastening the button and rotate the button to the extent that it is deemed necessary and try again to

lift and lower the bed. Repeat the operation until the desired position is reached. Remeber to fasten the 14 mm bolt.

We remind you of how to correctly check the end of stroke connection:

1) Control panel, by pressing the UP button the bed must go up and it must go down when pressing the DOWN button.

2) When pressing the end-of-stroke button while lifting the bed to the highest position, the bed must immediately stop. 29/06/2011

3) Press the end-of-stroke button (the one mounted on the mechanical encoder) to set the lowest position while lowering the bed: the

bed must immediately stop.

After doing this, check that the end of strokes are synchronized.

Silk-screen printing Logic ID Range Clamps Features - description

GND GND CN1 - 8 Negative power pole

MOT2 0 - 12Vdc CN1 - 7 Motor (grey)

- Not used CN1 - 6 Not used

F.C. (C-5) CN1 - 5 End-of-stroke (C-5) (orange)

+12 12Vdc CN1 - 4 Positive power pole

MOT1 0 - 12Vdc CN1 - 3 Motor (brown)

- Not used CN1 - 2 Not used

F.C. (C-4) CN1 - 1 End-of-stroke signal (C-4) (yellow)

(C-1)

English

Motor

( B )

Up End-of-Stroke

Adjustment Slot

( A )

Down End-of-Stroke

Relais control

Unit

Encoder unit

support bracket

Mechanical Encoder Unit

second version

with control unit on the motor side

VERSION No. 2

DEVICE ASCEND

STANDARD ROTATION