Lenze 931ExK10 - Handbuch (Seite 40)

Safety instructions
Residual hazards
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40 MA 13.0001 DE-EN DE/EN 2.0
1.2 Residual hazards
Protection of persons
After power-off, the power terminals UL, BR and GND still carry hazardous
voltages for at least 3 minutes!
ƒ Before working on the controller, check that no voltage is applied to the
power terminals.
ƒ Always protect the power terminals against contact.
The discharge current to ground (PE) is > 3.5 mA, according to EN 50178.
ƒ If a fixed installation is required, design the PE conductor with a cable
cross-section of at least 1.5 mm 2 or use a design with double
PE conductor.
Make sure that cables are installed correctly, and that bolted connections and
plug connections are faultless.
Due to the high currents with regard to low-voltage applications,
current-carrying parts can be strongly heated.
Device protection
ƒ Connect or disconnect all pluggable terminals in a deenergised state only!
ƒ A cyclic connection and disconnection of the supply voltage can overload
and destroy the input current limitation of the drive controller:
– When effecting a cyclic switching of the supply voltage over a longer
period, the period between two switch-on processes at least has to be
one minute!
Motor protection
Drive systems can reach dangerous overspeeds (e.g. setting of high field
frequencies for motors and machines which are not qualified for this purpose):
ƒ The controllers do not offer any protection against these operating
conditions. Use additional components for this.
Protection of the machine/system
A missing or incorrect resolver adjustment can bring about undefined control
states. The perfect operation is no longer guaranteed.