MT
2.4.5.1 Electrical delay
When the powerchair stops, the parkbrakes will be applied. However, the parkbrakes
must not be applied too early. The parkbrakes must
not engage
• if the powerchair stops to change direction (for example forward to reverse)
• before the powerchair has come to a halt after high deceleration
• before the powerchair has come to a halt when parking on a slope
The
Neutral to PB Delay parameter (see section 5.3.10.2) is the delay between zero
speed demand and the moment that the parkbrakes are de-energised.
The correct value of this parameter is dependent on the mechanics of the parkbrake
that is used on the chair. The delay must be longer for fast acting parkbrakes.
This parameter is set by the powerchair manufacturer for specific powerchair types. It
cannot be adjusted by dealers.
2.4.5.2 Mechanical delay
There is a significant delay between the moment that the parkbrake is de-energised
and the moment that the parkbrake actually engages mechanically. This delay
becomes important when the powerchair decelerates and stops. When the
powerchair has stopped, it will take some time before the parkbrakes are actually
engaged.
The Power Module uses the motors to brake and hold the powerchair during the time
that the parkbrakes are not engaged (active motor braking). The motor braking time
can be programmed with the
Brake / Bridge Off Delay parameter (section 4.3.3.2).
After the time defined in the Brake / Bridge Off Delay parameter the Power Module
will switch off the motors.
Warning:
Make sure that the Brake / Bridge Off Delay time is greater than the
mechanical delay of the parkbrakes used. The parkbrakes must
engage before the motors turn off, or the chair will roll away.
Brake / Bridge
Off Delay
Speed
Demand
Active Motor Braking
Parkbrakes engaged
Motors switched off
Neutral to
Parkbrake
Delay
Parkbrake
de-energised
Zero
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