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 ru06
must be above a defined speed threshold.
Speed level for blockade detection
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 ru06 above the value set in
pn87[2] detection speed level, pn87[3] detection time is running.
Time between falling below pn87[2] detection speed
levels until the blockade state is triggered.
If the ramp output value ru06 ramp out display is above the detection level and
ru08 actual value is below the level, the blockade time counter counts up.
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 detection
time.
If a blockade is detected, the content of ru06 changes: the setpoint speed valid for
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 speed.
The state of the blockade monitoring is displayed in pn87[6]. (See chapter 4.4.24.3
Blockade display).
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