PG DRIVES TECHNOLOGY NEWVSI TECHNICAL MANUAL – DIAGNOSTICS
SK80151-1 51
1 Introduction
The primary objective of this section is to assist service personnel in finding the likely area of a detected fault within the whole
wheelchair electrical system. It is important to realize that even though the controller is signaling a fault, it may not be the
controller itself that is defective. This is because the controller is able to detect problems in other electrical components (motors,
batteries, solenoid brakes etc.) or, more importantly, the wiring to them. When a controller has detected a fault a system trip is
indicated.
Using this guide, it is possible to define a trip as belonging to one of 10 types. Once this type has been established, there are
suggestions as to what the possible cause may be.
The guide should only be used to decide the starting point of your own diagnosis, as it is possible for the controller to indicate a
fault in another component even though the controller itself may be defective. Nevertheless, experience has shown that
connectors and wiring are the major cause of wheelchair electrical problems, so it is necessary to examine these more
vulnerable areas first.
Diagnostics should only be conducted by healthcare professionals with in-depth knowledge of
PGDT electronic controllers. An incorrect or badly effected repair could result in an unsafe set-up
of a wheelchair. PGDT accept no liability for losses of any kind arising from an incorrect or badly
effected repair.
2 Diagnostics
2.1 Diagnostics Process
For efficient and effective diagnosis the following basic steps should be taken.
• Establish the type of controller fitted to the wheelchair.
• Confirm there is a trip, or has been an intermittent trip.
• Establish the trip type.
• Refer to the trip table.
• Refer to the possible cause as indicated by the trip table, and carry out recommended investigative and
corrective action.
2.2 Detecting a Trip has occurred
Firstly observe the controller’s battery gauge. This will behave as described in one of the following sections.
2.2.1 All 5 LEDs in the battery display are flashing.
The controller is tripped.
• Connecting a programmer to the controller while this is happening will give you a trip code.
• To determine the trip type, refer to section 3.
2.2.2 First LED flashing slowly
No trip is currently detected by the controller. The slow flash is an indication that the batteries require charging.
• A trip may have occurred previously, read the controller’s diagnostic log, then refer to section 3 to establish the
trip type.
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