5 Parameter
BU 0600 en-2319 71
5 Parameter
Unexpected movement
Connection of the supply voltage may directly or indirectly set the drive unit into motion. This can
cause unexpected movement of the drive and the attached machine, which may result in serious or
fatal injuries and/or material damage. Possible causes of unexpected movements are e.g.:
– Parameterisation of an "automatic start"
– Incorrect parameterisation
– Control of the device with an enabling signal from a higher level control unit (via IO or bus
signals)
– Incorrect motor data
– Incorrect encoder connection
– Release of a mechanical holding brake
– External influences such as gravity or other kinetic energy which acts on the drive unit
– In IT networks: Earth fault (short circuit to earth)
•
To avoid any resulting hazard the drive or drive chain must be secured against unexpected
movements (mechanical blocking and/or decoupling, provision of protection against falling, etc.) In
addition, it must be ensured that there are no persons within the area of action and the danger
area of the system.
Unexpected movement due to parameter changes
Parameter changes become effective immediately. Dangerous situations may occur under certain
conditions, even when the drive is stationary. Functions such as P428 "Automatic Start" or P420
"Digital inputs" or the "Release Brake" setting can set the drive in motion and put persons at risk due
to moving parts.
Therefore:
• Changes to parameter settings must only be made when the frequency inverter is not enabled.
• During parametrisation work precautions must be taken to prevent unwanted drive movements
(e.g. lifting equipment plunging down). The danger area of the system must not be entered.
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