KEB COMBIVERT F5 BASIC Applications Manual page 189

Protective Functions
6.7.3 Automatic Restart
and Speed Search
Fig. 6.7.3.a Principle of speed search
X X
Conditions at the start of speed search
actual setpoint
actual rotation direction = old rotation direct. secure
Speed Search / Mode Pn.27
© KEB Antriebstechnik, 2002
All rights reserved
With automatic restart the inverter can reset errors automatically. The function can
be activated in a separate manner according to error with the Pn-parameters.
Because of the independent starting of the machine safety measures must be
provided for operating personnel and machine.
The function speed search permits the connection of the frequency inverter onto a
running out motor. After the function has been activated by the selected starting
conditions (Pn.26), it searches for the actual motor speed and adapts the output
frequency and voltage accordingly. If the synchronization point is found the inverter
accelerates the drive with the adjusted ACC-ramp to the setpoint. In regulated operation
the ramp output value is set to the measured actual value.
Terminal strip X2A
Terminal strip X2A
Pn.0 Automatic restart UP
0 = off 1 = on
Pn.1 Automatic restart OP
0 = off 1 = on
Pn.2 Automatic restart OC
0 = off 1 = on
Pn.3, 5, 7, 8, 10, 12, 14, 16, 18, 66
at value „3"
Add up the decimal values of the 3
blocks and enter it into Pn.27. (e.g.
100Hz/s = 2;
0.12 % = 8, 130 % = 32, setpoint = 0
Pn.27 = 2 + 8 + 32 + 0 = 42)
Function
≥ old setpoint
secure
≥ act. motor speed
secure
< act. motor speed critical
≠ old rotation direct. critical
The speed search mode determines the frequency and voltage jumps as well as the
maximum utilization with which the function works. Higher values let the function
work faster, lower values make the function „softer".
Name: Basis
KEB COMBIVERT F5
Functional Description
Pn.26
Power on
Pn.27
Value
0
1
2
3
4
5
6
7
0
8
16
24
0
32
0
64
Datum
18.04.02
Starting conditions
1 Control release
2 Power on
4 Reset
8 Auto-Reset
Speed search mode (dep. ud.2)
Frequency lowering by
50 Hz/s / 375 rpm
70 Hz/s / 525 rpm
100 Hz/s / 750 rpm
150 Hz/s / 1125 rpm
200 Hz/s / 1500 rpm
280 Hz/s / 2100 rpm
400 Hz/s / 3000 rpm
560 Hz/s / 4200 rpm
Voltage rise by
0.025 %
0.12 %
0.24 %
0.485 %
Utilization level up to
80 %
130 %
Search reference value
Set value
Measured actual value
Speed search
Kapitel Abschnitt
6 7
6
Seite
7
7