7
ANTRIEBSTECHNIK
6
7
7
KEB COMBIVERT F4-C
Name: Basis
12.03.99
6
Keep on Running Functions
©
KEB Antriebstechnik, 1997
All Rights reserved
Functional Description
Section
Page
Date
Chapter
6.7.3
Automatic Restart
and Speed Search
Picture 6.7.3.a
Principle of speed search
Conditions for the start of speed search
Function
≥
former set value
safe
actual set value
≥
act. motor speed
safe
< act. motor speed
critical
actual rotation direction= former rotation
safe
≠
former rotation
critical
Speed Search Mode Pn.50
The speed search mode defines the frequency and voltage jumps as well as the
maximim load with which the function works. Higher values let the function work
faster, lower values make the function „smoother“.
The speed search with actual speed detection is only possible with an optional encoder
interface. In that case the output frequency is put directly on the measured motor
speed. However, the voltage rise takes place as adjusted.
With the automatic restart the inverter error can be reset automatically. The function
can be activated separately for different errors with Pn.0...Pn.2.
Because of the automatic restart of the machine protective measurements for
the operating personnel and the machine must be taken care of.
The function speed search permits the connection of the frequency inverter to a
coasting motor. After the function is activated by the selected starting conditions, it
searches for the current motor speed and adapts output frequency and voltage in
accordance to it. If the synchronization point is found, the inverter accelerates the
drive with the adjusted ACC-ramp to the set value.
Pn.7
Starting condition
1
Control release
2
Power on
4
Reset
8
Auto-Reset
Pn.50 Speed search mode
Value Frequency jump
0
50 Hz/s
1
70 Hz/s
2
100 Hz/s
3
150 Hz/s
4
200 Hz/s
5
280 Hz/s
6
400 Hz/s
7
560 Hz/s
Voltage jump
0
0,025 %
8
0,12 %
16
0,24 %
24
0,485 %
Load level
0
80 %
32
130%
Speed search
0
with speed detection
64
without speed detection
Automatic Restart UP
0= off 1=on
Pn.0
Automatic Restart OP
0= off 1=on
Pn.1
Automatic Restart OC
0= off 1=on
Pn.2
Terminal strip X1.19
Power on
Terminal strip X1.20
Speed search
