Menu 12
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228 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 10
The pre-brake release delay is used to allow time for the motor torque to reach the required level before the brake is released. This time should allow
for the motor flux to reach a significant proportion of the rated level (2 or 3 times the rotor time constant of the motor), and the time for slip
compensation to become fully active (at least 0.5s). During the Pre-brake delay period the frequency reference is held constant (Pr 2.03 = 1).
The post-brake release delay is used to allow for the brake release time. During this period the frequency reference is held constant (Pr 2.03 = 1), so
that there is no sudden increase in motor speed when the brake actually releases.
12.46
Pre-brake release delay
Drive modes Open-loop
Coding Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range Open-loop 0.0 to 25.0 s
Default Open-loop 1.0
Update rate Background read
12.47
Post-brake release delay
Drive modes Open-loop
Coding Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range Open-loop 0.0 to 25.0 s
Default Open-loop 1.0
Update rate Background read
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