Dynamic DX, Руководство пользователя, Страница: 12 / 144

2.1.1 General wiring recommendations
• Keep all cables as short as possible.
• Try to run wires in pairs or bunches.
•
Do not route the motor cables near the motor case, where possible.
• Avoid wire loops, especially loops of single wires instead of wire pairs.
• Fasten cables to the powerchair frame to prevent strain on the connectors.
• Do not leave electrical connections unnecessarily exposed.
• Make sure that all vehicle sub-frames are electrically connected.
• To minimise electromagnetic emissions by the motor brushes, it may be necessary
to fit capacitors between the brush holders and the motor case. Make sure that
the leads are kept as short as possible. A suitable capacitor is 4n7, 250V
Polypropylene.
• For low-current signals, do not use wire sizes smaller than 0.5 mm
2
/AWG20, because
smaller wires are physically not strong enough for this application.
• For best electrical performance, the wire size must be as large as possible.
Maximum Wire
Current
Recommended
Minimum Wire Size
Power Module
60A 3 mm
2
/ AWG 12
80A 4 mm
2
/ AWG 11
100A 6 mm
2
/ AWG 9
The Power Module wire sizes above are appropriate for cable lengths up to
400 mm / 15". For longer cables, increase the wire size by 0.5 mm
2
for every
additional 200 mm / 7.5" in length. Generally, the larger the wire size, the better the
powerchair performance will be.
• Do not use damaged or abused cables. A damaged cable can potentially
produce localised heat, sparks or arcing and as such it can cause a fire.
•
Protect all cables against possible contact with flammable material.
• Where possible, the installation must prevent and/or discourage the user to
disconnect the DX BUS cable.
Warning:
1. Route the cables and fasten all DX components in a position so
that the cables, the connectors and the connector sockets do not
allow water entry or suffer from physical strain, abuse or damage,
like cutting or crushing. Take particular care on powerchairs with
movable structures like seat raise/tilt or swing-away arms. Make
sure that the cables do not extend from the powerchair so that
they can not be caught or damaged by external objects.
2. The DX BUS cable distributes 24V power to the DX modules, even
when the system is switched off. Avoid short circuit between the
DX BUS cable pins whenever a DX BUS connector is removed from
its socket. Make sure that the DX BUS connector can not reach
potential shorting points. If any protruding, bare metal screws or
pins are within reach of a DX BUS cable end, cover or plastic-coat
them to make sure that they do not cause short circuits between
DX BUS cable pins. Disconnect all the cables of the powerchair at
the powered end whenever units are replaced or moved.
3. The user maintenance schedule and the service instructions of the
powerchair must include the appropriate inspection and
maintenance requirements for the connectors and the cables.
GBK60348
: Issue 1 – October 2007
12