Power Step PSA-D11R-FL, Manual

FOLDING STAIRWAY

Caterpillar D11R Dozer

Pg28

PSA-D11R-F/L

210610

1)

Universal application wiring system. The one wiring system has been designed to 
adapt to any machine with any site requirement.

2)

All system switches are illuminated for clear visibility in darkness.

3)

The system incorporates a park brake release option which, in most cases, can 
utilise the original park brake system pressure switch to control the ladder system. 
This feeds a signalback which can be plugged into the OEM harness to tell the 
machines' original system the park brake status.

4)

The system has an optional boarding light option which can be operated from inside
the cab or at ground level (optional), the boarding ladder circuit is controlled by an 
adjustable timer set to approximately three minutes, the operator need only press 
either of the momentary boarding light switches once, to activate the timer. The 
lights will illuminate for three minutes or until the park brake is released which also 
turns the lights off. The boarding lights will not activate if the park brake is released 
(if the park brake option is used).

5)

The system will raise the ladder automatically when the park brake is released and 
will not allow the ladder to be lowered if the park brake is released (if the park brake
option is used).

6)

The system will only sound the cabin alarm when the park brake is released and 
the ladder is not fully home (if the park brake option is used).

7)

The system will automatically raise the ladder should it creep down over a period of
time while the machine is in service while the park brake is released (if the park 
brake option is used).

8)

The system is designed with a dual tone alarm (external) which will be mounted on 
the rear of the box. This can be extended to mount anywhere else on the machine 
using the optional extension cables. The system has a pre-movement tone and an 
actual movement tone. When the up button, down button or park brake is released 
the premovement alarm will sound for three seconds to warn personnel in the 
vicinity that the ladder is about to move, then when the ladder actually moves it 
changes tone until the ladder has completed its movement stroke.

9)

If the ladder becomes stuck mid way or, a hydraulic hose fails, the alarm will 
continue to sound until the power is switched off, but the hydraulic motor will only 
run for one minute on the motor protection timer. The motor protection timer 
prevents the hydraulic motor from running to destruction should the ladder not 
reach its top or bottom stroke for whatever reason.

The Power Step electrical control system has been designed to cater for every
conceivable circumstance in the mining industry.

The system has been built to withstand all the environmental issues normally associated
with mining and some additional features not yet seen on any current systems.
These features include:

Access System Electrical Overview