Control Techniques unidrive sp Advanced User's Manual page 203

Parameter Keypad and
Menu 12
structure display
12.46 Pre-brake release delay
Drive modes Open-loop
Coding Bit SP
Range Open-loop
Default Open-loop
Update rate Background read
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).
12.47 Post-brake release delay
Drive modes Open-loop
Coding Bit SP
Range Open-loop
Default Open-loop
Update rate Background read
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.
202
Parameter Parameter
x.00 description format
FI DE Txt VM DP ND
1
0.0 to 25.0 s
1.0
FI DE Txt VM DP ND
1
0.0 to 25.0 s
1.0
www.controltechniques.com
http://nicontrols.com
Advanced parameter
Macros
descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Serial comms Electronic
Performance
protocol nameplate
PS
1
PS
1
Unidrive SP Advanced User Guide
Issue Number: 7
Feature look-
up table