Dynamic DX Power Module PMB Installation Manual page 33

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Function
Battery +
Battery -
Notes :
1. The motor wiring should be as short as practical in order to minimise
voltage drops in the cable.
2. The battery wire sizes above are appropriate for battery loom lengths up to
400mm. For looms longer than this, increase the wires size by 0.5mm² for
every additional 200mm in length. Generally, the larger the battery
conductor size, the better the wheelchair performance will be.
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A thermal circuit breaker must be installed between the batteries and the PM, as
close as possible to the batteries, to protect both the batteries and the system
wiring. If the two batteries are permanently wired together (single battery box), the
best position for the circuit breaker is between the two batteries. If the batteries are
individually plugged together (separate battery boxes), each battery requires a
circuit breaker.
The thermal circuit breaker will normally have a trip rating no higher than the
current limit of the PM, or half the current limit of the PM-S. Check thoroughly to
ensure that it provides the necessary degree of motor protection.
Wiring from the PM to the batteries must be as shown. The size of the wires as
shown by thicker lines in the following diagram must be either twice the area
(mm²) as specified above, or else two wires must be used. The size of the other
wires is as specified above.
Wire Size (PM Type)
PM / PM1 / PM-S
3mm²
3mm²
Terminal Part
PM2
4mm² AMP Innergy 556880-2
4mm² AMP Innergy 556880-2
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