Retsch MM 400 - Manual (Page 23)

2/8/2012 23 Retsch GmbH
Safety functions and fault displays
Safety functions
F01 - Overloading
In order to avoid overloading of the drive motor and resulting
endangerment to the user the MM 400 is fitted with a load monitoring
device.
In case of overloading the monitoring function switches the machine
off in good time.
At the end of the cooling time it is only necessary to switch the
machine off and on again in order to be able to operate it normally
again.
F02 – Speed recognition, zero speed
If the drive does not start up after pressing the start button there is a
fault in the system. Possible causes: drive blocked, motor or speed
sensor defective.
F03 – Speed recognition, overspeed
If the specified frequency is exceeded after starting, „F3” appears in
the display and the machine is switched off.
Possible cause of fault: defective speed sensor.
F04 – Hood open
The drive must not run when the hood is open. This serves to protect
the operator against injury. If the hood is opened when the machine
is running the control unit switches the drive off immediately and
“F04” appears in the display. If the start button is pressed with the
hood open in order to start the milling process “F04” is also displayed
and the drive is not started.
This alarm can be cancelled by pressing the stop button.
F05 –Keyboard monitor
If one or more buttons are pressed for longer than 15 seconds the
control unit switches the drive off and displays “F05”.
This function is intended to prevent unintentional faulty operation if
any object accidentally presses on the keyboard.
In order to cancel this fault alarm switch the machine off and on
again once.
F06 – Magnetic speed monitoring sensor
If one of the magnets that monitors speed is missing or defective,
this will be detected by the control, which will then switch off the
machine. “F06” will appear in the display. To eliminate this fault, it
must be repaired by authorised Retsch service technicians.
F07 – Magnetic switch – hood monitoring
If the magnetic switch which monitors hood opening has a defect in
the supply line this is recognised by the control unit and causes the
machine to be switched off. “F07” appears in the display. To eliminate
this fault repair by an authorised Retsch service agent is necessary.
F01
F03
F04
F05
F07
F02
F06