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

Safety Mechanical
Product
Information information Installation
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
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
172
Electrical Getting Basic Running the
Installation Started parameters
+
Drive
active
_
10.02
+
_
+
_
Pr 12.45
4 5
6.01 =1,2 or 3)
www.controltechniques.com
SMARTCARD
Optimization
motor operation
X
X
X
X
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
Brake apply frequency
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
6
Technical
Onboard Advanced
Diagnostics
PLC parameters Data
Key
Input
Read-write (RW)
0.XX
terminals
parameter
Read-only (RO)
Output
0.XX
parameter
terminals
Post-brake
release
delay
12.47
2
3
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.
Unidrive SP Free Standing User Guide
UL Listing
Information
Ramp
hold
2.03
12.40
Brake
release
Issue Number: 1