ESP program features 43
The figure below shows the control scenarios of Restart delay and Backspin speed
observer functions.
The table below describes the control scenarios of Restart delay and Backspin speed
observer functions.
Control
scenario
Description
1
Parameter 74.20 Restart delay enable function activates as soon as
the user drive start command is set to OFF.
1 - 2
New normal start command cannot accept for the period of time set in
parameter 74.21 Restart delay time.
2 - 5
You can safely enable drive start command when restart delay is active.
Backspin speed observer function will detect the actual motor speed
without interfering the motor mechanically.
3 - 4
If the restart delay function is still active, it prevents drive from starting
normal operation even if observer measured speed is in the speed
region defined as safe to restart.
1
2 3 4 6 75
0
8
9 10 11 12 13 14 15
74.30 Speed observer enable
74.20 Restart delay enable
User Drive start command
74.21 Restart delay time
09.41 Restart delay remaining
06.16 Drive status word 1, bit 6
Start interlock
Speed measurement routine
74.39 Measurement delay
74.33 Observer speed check time
74.99 ESP start/stop sw, bit 6
74.99 ESP start/stop sw, bit 8
Actual speed
Measured speed
74.32 Restart speed limit high
74.31 Restart speed limit low
Time
Time
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Time
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Time
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