Control Techniques Digitax ST - Page 164

Menu 12
Parameter
structure
Keypad and
display
Parameter x.00
Parameter
description format
Advanced parameter
descriptions
Serial comms
protocol
Electronic
nameplate
Performance
164 Digitax ST Advanced User Guide
www.controltechniques.com Issue Number: 1
Stage 1: Restore I/O
Stage 2: Set-up I/O
If the current magnitude falls below the lower current threshold the brake is applied immediately. The lower threshold should be set to the required
level to detect the condition where the motor has been disconnected from the drive. If this parameter is set to zero the loss of current will not cause
the brake to be applied. However, the flux detection and current threshold latch will be reset when the drive is disabled.
When stopping, the drive reference can be removed (i.e. Pr 1.11 = 0), but the brake will remain energized (open) until the motor has remained at a
speed below the brake apply speed for the delay defined by Pr 12.46. The delay prevents rapid activation and de-activation of the brake when fine
control of a motor is required close to zero speed.
See Pr 12.45.
Initial setting in
Pr 12.41
Pr 8.12 (Invert)
Pr 8.22 (Source /
destination)
Pr 8.32 (Input/
output)
Pr 8.17 (Invert) Pr 8.27 (Source)
0 No action
10Pr 10.33 00Pr 10.01
20Pr 10.33 0 No action
3 No action
Initial setting in
Pr 12.41
Pr 8.12 (Invert)
Pr 8.22 (Source /
destination)
Pr 8.32 (Input/
output)
Pr 8.17 (Invert) Pr 8.27 (Source)
0 No action
10Pr 10.01 10Pr 12.40
20Pr 12.40 1 No action
3 No action
The control terminal relay can be selected as an output to release a brake. If a drive is set up in this manner and a drive replacement takes
place, prior to programming the drive on initial power up, the brake may be released.When drive terminals are programmed to non default
settings the result of incorrect or delayed programming must be considered. The use of a Smartcard in boot mode or an SM-Applications
module can ensure drive parameters are immediately programmed to avoid this situation.
12.43
Low current threshold
Coding Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 200 %
Default 10
Update rate Background read
12.45
Brake apply speed
Coding Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 200 rpm
Default 5
Update rate Background read
12.46
Brake apply speed delay
Coding Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range 0.0 to 25.0 s
Default 1.0
Update rate Background read
WARNING