Dynamic DX Power Module PMB Installation Manual page 29

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If the wheelchair has two 24V Park Brakes, the preferred wiring is as follows.
The above Park Brake configuration is referred to as the Dual Park Brake as each
Park Brake is driven from a separate output.
For this configuration, the PM Park Brake parameter is set to 'dual'. See the
Programming section.
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Both 24V Park Brakes can be driven in parallel
from the M1 connector as shown, but this is
discouraged. For this purpose the M1 connector
must be used.
If the Park Brakes are connected to the M2 BP+
connector instead of M1, a Left Park Brake fault
(Flash Code 5) will occur.
For this configuration, the PM Park Brake
parameter is set to 'sngl'. See the Programming
section. If set to 'dual', a Right Park Brake fault
(Flash Code 6) will occur.
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