PG DRIVE TECHNOLOGY NEWVSI, Техническое руководство

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PG D
RIVES
T
ECHNOLOGY NEW
VSI T
ECHNICAL
M
ANUAL
– I
NSTALLATION
SK80151-1 27
The chair manufacturer must install a suitable circuit breaker to provide protection against short
circuits in the battery wiring, power loom or the controller. Failure to comply with this could
result in a fire hazard. PGDT accepts no liability for losses of any kind arising from failure to
comply with this condition.
4.4 Motor Wiring
In order to detect the disconnection of a motor while the wheelchair is in motion, the brake current must pass through the same
connectors as the motor current, so that disconnection of either motor will interrupt the brake circuit and trip the controller. Refer
also to section 4.5.
When the controller is starting up or standing by, it is able to detect a disconnected motor or a short circuit between a motor
connection and either battery supply. With the TruCharge battery gauge, the number of flashes indicates the type of trip.
If circuit breakers are fitted in series with the motors, you must fit circuit breakers with auxiliary switches which will disconnect the
brake circuit if either circuit breaker operates. In this way the controller can detect that the motor has been disconnected and
stop the wheelchair. Should the motor be put into a stalled condition, the timed current foldback facility in the controller can also
be used to offer some level of motor protection.
4.5 Solenoid Brake Wiring
The controller will be immobilized instantly if the brake current is less than approximately 100mA.
•
The maximum continuous current is 1A.
4.5.1 newVSI Anderson
The newVSI (Anderson) can independently detect open circuit brake faults on either the left or right brake connections. This aids
the diagnostic process. For details of the fault codes refer to chapter 4, section 3.
4.5.2 newVSI Beau
It is recommended that the wheelchair is fitted with two 12V brakes connected in series in order to detect the disconnection of
one brake. It is possible to use two 24V brakes connected in parallel, however, disconnection of an individual brake may not be
detected by the control system.
5 Drive Motors
The controller is designed to be connected to permanent magnet DC motors, fitted with suitable gearboxes and solenoid
brakes.
In order to optimize the performance of the wheelchair, the controller must be matched to the motor terminal impedance. This
matching is implemented by programming the controller. The parameter for adjustment is Motor Compensation. Refer to
Chapter 3 for details.
The Motor Compensation value should be set in accordance with the armature resistance of the motor and all cables and
connectors between the newVSI and the motor. The value is set in milli-Ohms. A recommended value is:
•
70% of the (armature resi cables and connectors)
Motor manufacturers should be able to supply figures for armature resistance and cable and connectors may typically be
40mOhms.
Example:
Motor has armature resistance of 200mOhms
Cables and connectors are 40mOhms
Set Motor Compensation to 0.7 x (200 + 40) = 170mOhms
Failure to match the controller with the motors may result in poor control characteristics.