Control Techniques Digitax ST Advanced User's Manual page 165

Parameter Keypad and
Parameter x.00
structure display
Post-brake release delay
12.47
Coding Bit SP
Range 0.0 to 25.0 s
Default 1.0
Update rate Background read
The post-brake release time is used to allow for the brake release time. From the time that the drive is enabled and then during this period the speed
reference is held constant at zero, so that there is no sudden increase in motor speed when the brake actually releases.
Brake-apply delay
12.48
Coding Bit SP
Range 0.0 to 25.0 s
Default 1.0
Update rate Background read
The brake apply delay is used to allow for the brake application time. During this period the Hold zero speed parameter (Pr 6.08) is one, and so the
drive is enabled with zero speed reference. This ensures that the motor remains stationary while the brake is being applied.
Enable position controller during brake release
12.49
Coding Bit SP
1
Default 0
Update rate Background read
If this parameter is zero then ramp hold only is applied when the drive is not active and until the end of the post-brake release delay to ensure that the
speed reference remains at zero until the brake has released. If this parameter is set to one the position controller (see menu 13) is also enabled
(Pr 13.10 = 1) and the local position reference source is selected (Pr 13.04 = 4(LocAL)) during the period when ramp hold is active. Provided the
default, non-absolute mode, is selected the position controller can help to limit the movement of the motor when the brake is released. When Pr 12.49
is changed from one to zero Pr 13.04 and Pr 13.10 are automatically set to zero.
Digitax ST Advanced User Guide
Issue Number: 1
Parameter
description format
FI DE Txt VM DP ND
1
FI DE Txt VM DP ND
1
FI DE Txt VM DP ND
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Advanced parameter Serial comms
descriptions protocol
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Electronic
Performance
nameplate
PS
1
PS
PS
Menu 12
165