Figure 11-17 Open-Loop Brake Function; Figure 11-18 Open-Loop Brake Sequence - Emerson unidrive sp User Manual

Safety Product Mechanical
Information Information Installation
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
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.
WARNING

Figure 11-17 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 11-18 Open-loop brake sequence

Pr 12.44 Brake release frequency
Pr 12.42 Upper current threshold
1 2 3
Pr 12.46 Pr 12.47
204
Electrical Getting Basic
installation Started parameters
+
Drive
active
_
10.02
+
_
+
_
Pr 12.45 Brake apply frequency
4 5 6
www.controltechniques.com
Running SMARTCARD
Optimization
the motor operation
X
X
o
i
Brake
LAT
controller
r
enable
T25 digital
8.12
I/O 2 invert
Relay source
8.17
invert
T25 digital I/O 2
8.22
source / destination
Relay source
8.27
T25 digital I/O 12
8.32
output select
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
Onboard Advanced Technical
PLC parameters Data
Key
Input
X
Read-write (RW)
0.XX
terminals
parameter
Read-only (RO)
X
Output
0.XX
parameter
terminals
Post-brake
release
delay
12.47
2
3
12.41
12.46
Pre-brake
release
delay
input
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.
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
Unidrive SP User Guide
UL Listing
Diagnostics
Information
Ramp
hold
2.03
12.40
Brake
release
output
6.01 =1,2 or 3)
Issue Number: 13