IMD 100 Integration manual 4189360015 Rev. G
Functions description
Page 64 of 243
6.4.1 Brake engagement (Brake output OFF)
Before starting the brake engagement sequence, the motor output of the IMD is ON, which means that
the Run input is high, and the Enable dev. is active. The brake output is ON (brake disengaged).
Once the Run input is set to Low or the Enable dev. is deactivated, the IMD will stop the blade motor
motion with the pre-configured (ramp limit) deceleration ratio. When the speed reaches zero and after
50 ms fixed delay, the brake output is turned OFF. While the speed is zero at this point, the
modulation to the motor is still ON to ensure that the blade motor holds its position. After the
preconfigured brake output OFF delay has passed, the modulation to the motor stops.
The brake delay purpose is to ensure that the brake efficiency is 100% before stopping the modulation
(position control). The following figure illustrates the described sequence.
Modulation
(position)
Speed
Brake
output
Braking
efficiency
Run or
Enable dev.
Deceleration
(ramp defined by
N dec.time)
Fixed 50 mS
delay
Brake output OFF delay
On
Off
On
Off
On
Off
100%
0%
Max
0
Time
Figure 34
Brake engagement sequence
Info
illustrates a case where the blade motor is stopped and
brake activated while in motion. If the blade motor is not in motion the speed is
already zero and the Ramp-limit deceleration time is therefore equal with zero.