NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
130 BU 0200 en-3118
5 Parameter
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WARNING
Unexpected movement
Connection of the supply voltage may directly or indirectly set the drive unit into motion. This may cause an
unexpected movement of the drive unit and the machine which is connected to it. This unexpected movement
may cause severe or fatal injuries and/or material damage.
Unexpected movements may be due to several causes, 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.
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WARNING
Unexpected movement due to parameter changes
Parameter changes become effective immediately. Dangerous situations can 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 put 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
gear plunging down). The danger area of the system must not be entered.
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WARNING
Unexpected movement due to overload
In case of overload of the drive there is a risk that the motor will "break down" (= sudden loss of torque). An
overload may be caused e.g. by underdimensioning of the drive unit or by the occurrence of sudden peak loads.
Sudden peak loads may be of a mechanical origin (e.g. blockage) or may be due to extremely steep acceleration
ramps (Parameter P102, P103, P426).
Depending on the type of application, "breakdown" of the motor may cause unexpected movement (e.g. dropping
of loads by lifting gear).
To prevent any risk, the following must be observed:
• For lifting gear applications or applications with frequent, large load changes, the parameter (P219) must
remain in the factory (100 %).
• Do not underdimension the drive unit, provide adequate overload reserves.
• If necessary, provide fall protection (e.g. for lifting gear) or equivalent protective measures.
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