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Park Brake
Set to ‘dual’ when both Park Brake outputs are used i.e. the Park Brakes are
connected to PB+ on both M1 and M2. If only one PB+ output is used, a
Right Park Brake fault (Flash Code 6) will occur.
Set to ‘sngl’ when only one Park Brake output is used. This output will always
be the M1 PB+ output (normally the Left Motor and Park Brake connector).
If the M2 PB+ output is used instead, a Left Park Brake fault (Flash Code 5)
will occur.
The PM-S must have this parameter set to ‘dual’.
Brk / Bridg Off Delay
Brk / Brdg Off Delay is the delay between de-energising the Park Brake and
turning off the H Bridge and opening the isolate relay.
When the joystick is returned to neutral the speed demand returns to zero at
the programmed deceleration rate for the drive program in use at that time,
reducing to a low deceleration as the wheelchair approaches a standstill.
The Neutral to PB Delay parameter is set as a UCM Wizard parameter, and
is the delay between zero speed demand and de-energising the Park Brake. It
is dependent on the particular Park Brake mechanics and is higher for chairs
with fast acting Park Brakes. It is set so as to minimise the jerk when
stopping at high deceleration and when parking on a slope. The jerk is also
influenced by the Load Compensation setting. The Neutral to PB Delay also
prevents the Park Brakes being applied when the joystick is passed through
neutral and no stopping is intended.
Being inductive and mechanical, Park Brakes can take a significant time to
engage from the time power is removed. To provide positive braking and to
reduce roll back on a slope while the Park Brake is engaging, the PM
maintains active motor braking for the programmed duration Brk/Bridg Off
Delay. It should be set greater than the Park Brake's engage time.
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