Black BLK-SY10 Series Service Manual download pdf (Page 94)

SKYJACK, Page 3SJIII Series

Section 5 - Procedures Service and Maintenance

General

The following information is provided to assist you in

the use and application of servicing and maintenance

procedures contained in this chapter.

Safety and Workmanship

Your safety, and that of others, is the first consideration

when engaging in the maintenance of equipment. Al-

ways be conscious of weight. Never attempt to move

heavy parts without the aid of a mechanical device. Do

not allow heavy objects to rest in an unstable position.

When raising a portion of the equipment, ensure that

adequate support is provided.

Platform

5.1-1 OEM Controller Electronics Information

Flow Control

Single coil or solenoid for single direction. The coil has

two connections; one is wired to the P.C. Board (A) ter-

minal and the other is wired to (-), or the negative side

of the supply voltage. Switches to control directional

valves may be provided on the controller.

Adjustment Procedures

Adjustments are made by turning a trimpot adjustment

screw. The trimpots are multi-turn, end to end-devices. It

may be necessary to turn the adjustment screw several

turns to observe a change in output.

Clockwise (CW) adjustment of the trimpot increases

the output.

Counter-clockwise (CCW) adjustment of the trimpot

decreases the output.

Adjustments affect output current, voltage or per-

centage of duty cycle to the coil. The minimum and

maximum output is preset at the factory. However, for

optimum performance, they must be adjusted while the

equipment is operating.

Although the following adjustments affect the current/

voltage or percentage of duty cycle, the best way to

adjust the function is to observe the response or speed

of the function. The following adjustments affect func-

tion response, or speed. There may be some interaction

between adjustments, making it necessary to repeat the

adjustment in order to achieve the desired response.

“Threshold” Adjustments

Adjusts the initial current flow or duty cycle, affecting

the function response or speed when the handle is first

moved from the off position. Deflect the handle slowly

to the position where the controller first turns on. Adjust

the threshold trimpot screw to the point where the con-

trolled function just starts to move, then turn the trimpot

screw one, full turn in the counterclockwise direction.

This adjustment should be done first.

“Maxout” Adjustments

Adjusts the full stroke current or duty cycle affecting the

maximum function response, or speed when the handle

is deflected to its full travel. Fully deflect the handle,

and adjust the maxout trimpot for maximum desired

function response or speed. To obtain proportional

resolution, it is important that the function starts to slow

down as soon as the handle is moved back from the

fully deflected position.

The ideal adjustment occurs when the function just

begins to move when the handle is deflected, and the

output increases until it reaches its maximum desired

response or speed at the end of handle travel.

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Black BLK-SY10 Series Service Manual Page 94

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