Blockade Handling - KEB COMBIVERT F6 Programming Manual

Protection functions

Blockade handling

If the inverter tries to start against a mechanical blockage during start-up, or if the
motor is blocked during operation, the inverter should detect this and react auto-
matically without intervention by a control.
4.4.24.1 Blockade detection
By way that the motor blockage detection is activated, the ramp output value
must be above a defined speed threshold.
pn87[2] detection speed level
Value Display
0.0000...10000.0000
0...81920000
rpm
The motor blockage detection compares the ramp output value (ru06) with the ac-
tual value (ru08).
If the actual value (ru08) is below and the setpoint
pn87[2] detection speed
pn87[3] detection time
Value Display
0...10000 0.00...100.00 s
If the ramp output value
ru08 actual value
If one of the conditions is no longer met, the counter counts down.
The state blockade is set if the counter reaches the end value defined by
time.
If a blockade is detected, the content of
the speed controller is no longer determined by external setpoints or the ramp gen-
erator, but is set by the programmed blockade reaction. The speed that would be
valid if it were not suppressed by the blockade reaction can be seen in parameter
ru86 standard set
The state of the blockade monitoring is displayed in pn87[6]. (See chapter 4.4.24.3
Blockade display).
© 2022 KEB Automation KG
Note
Speed level for blockade detection
level, pn87[3] detection time
Note
Time between falling below pn87[2] detection speed
levels until the blockade state is triggered.
ru06 ramp out display
is below the level, the blockade time counter counts up.
ru06
speed.
0x2A57 [2]
ru06 above the value set in
is running.
0x2A57 [3]
is above the detection level
changes: the setpoint speed valid for
ru06
and
detection
103