Open-Loop Brake Function; Open-Loop Brake Sequence - Emerson unidrive sp User Manual

Parameter Keypad and
Menu 12
structure display
Open-loop
The brake control functions are provided to allow well co-ordinated operation of an external brake with the drive. While both hardware and
software are designed to high standards of quality and robustness, they are not intended for use as safety functions, i.e. where a fault or
failure would result in a risk of injury. In any application where the incorrect operation of the brake release mechanism could result in injury,
independent protection devices of proven integrity must also be incorporated.
WARNING
Figure 5-20 Open-loop brake function
Current
magnitude
4.01
Upper current
threshold
12.42
12.43
Lower current
threshold
Output
frequency
5.01
Brake release
frequency
12.44
Brake apply
frequency
12.45
Reference
on
1.11
Figure 5-21 Open-loop brake sequence
Pr 12.44 Brake release frequency
Pr 12.42 Upper current threshold
1
Pr 12.46
1. Wait for upper current threshold and brake release frequency
2. Pre-brake release delay
3. Post-brake release delay
4. Wait for brake apply frequency
5. Wait for zero frequency
6. 1s delay as phase 2 of stopping sequence (Pr
226
Parameter Parameter
x.00 description format
+
Drive
active
_
10.02
+
_
+
_
2 3
Pr 12.47
6.01
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Advanced parameter
Macros
descriptions
Input
X
X
terminals
X
Output
X
terminals
o
i
Brake
LAT
controller
12.41
r
enable
T25 digital
8.12
I/O 2 invert
Relay source
8.17
invert
T25 digital I/O 2
8.22
source / destination
8.27 Relay source
T25 digital I/O 12
8.32
output select
Pr 12.45 Brake apply frequency
4 5 6
=1,2 or 3)
Serial comms Electronic
Performance RFC mode
protocol nameplate
Key
Read-write (RW)
0.XX
parameter
Read-only (RO)
0.XX
parameter
Post-brake
release
delay
12.47
Ramp
2
12.40
3
Brake
release
12.46
Pre-brake
release
delay
input output
i o
LAT
reset
r
If the reset input is 1, the output is 0.
If the reset input is 0, the output
latches at 1 if the input is 1.
Pr 5.01 Output frequency
Pr 4.01 Current magnitude
Pr 10.02 Drive active
Pr 1.11 Reference on
Pr 12.40 Brake release
Pr 2.03 Ramp hold
Unidrive SP Advanced User Guide
hold
2.03
Issue Number: 10