IKA A 11 basic - Manual (Page 18)

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The motor is locked after the On/Off - switch has been pressed, or the
mill switches off shortly after it has started.
Causes:
- Too much grinding material in the grinding container (filling hight exceeded).
- The feed granularity is too coarse.
- Motor circuit breaker is tripped because of lock (overload).
Remedy:
- Release the On/Off - switch and remove the grinding container. If fragments of
the grinding material have become stuck between the grinding tool and the guard
ring, do not remove them until after you have disconnected the power cord.
- Fill the grinding container with a sufficient amount of pre-reduced grinding
material.
- Do not exceed the maximum filling hight in any case.
- In the case of hard or tough grinding material, reduce the maximum filling hight
by 50%.
- If the motor circuit breaker has been tripped, you must wait until it switches
back off.
- Wherein the triggered circuit breaker (100-115V version) this will be as described
above with no waiting time is reset.
The motor speed falls sharply or the mill is locked during operation:
Causes:
- The feed granularity is too coarse, ≥ 10 mm.
- There is too much feed material in the grinding container.
- The grinding material is too tough.
- The pulverization tool is being lowerded down into the grinding material too
quickly.
Remedy (motor speed falls):
- The speed can be kept at a constant level if the grinding tool is moved slowly
into the grinding material. If the speed drops off, you should not lower the tool
any further. Instead you should raise it again and try to move the tool slowly into
the grinding material at the nominal motor speed.
Remedy (locking):
- Release the On/Off - switch and remove the grinding container. If fragments of
the grinding material have become stuck between the grinding tool and the guard
ring, do not remove them until after you have disconnected the power cord.
Caution: The shaft of the grinding container and the pulverization
tools may not be hot. If necessary, allow the mill to cool off.
- Fill the grinding container with a sufficient amount of pre-reduced grinding
material.
- Do not exceed the maximum filling hight in any case.
- In the case of hard or tough grinding material, reduce the maximum filling
height by 50%.
- If you do not release the On/Off - switch and the motor is locked, the motor
circuit breaker or the circuit breaker (at 100-115V) will be tripped.
- Before continuing with operation allow the mill to cool off or reset the circuit
breaker.
The drive suddenly cuts out during the grinding procedure:
Causes:
- Overheating of the drive (malfunction display lights up when the On/Off - switch
is pressed, parts of the housing are warm).
- The grinding container has rotated itself loose and has triggered the circuit
breaker (malfunktion display lights up when you push the On/Off - switch).
- The power supply has been interrupted.
Remedy:
- If the mill has overheated, wait a few minutes.
- Screw in the grinding container up to the stop.
- Check the power supply.
The lifting motion is blocked:
Causes:
- The middle section is dirty.
Remedy:
- Clean the middle section (see the section entitled „Maintenance and cleaning“).
If this occurs quite often, you should check the seal (item 20), (if necessary, replace
the seal as described in the section „Maintenance and cleaning“).