Safety instructions
Residual hazards
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EDK94SH104 ZH/EN 5.1
2.2 Residual hazards
Protection of persons
ƒ Before working on the controller, check that no voltage is applied to the power
terminals, because
– depending on the controller − the power terminals U, V, W, +UG, −UG, Rb1 and Rb2
carry hazardous voltages for up to 3 to 20 minutes after mains disconnection.
– the power terminals L1, L2, L3; U, V, W, +UG, −UG, Rb1 and Rb2 carry hazardous
voltages when the motor is stopped.
Device protection
ƒ Plug on or pull off all pluggable terminals only in deenergised condition!
ƒ Cyclically switching on and off of the mains voltage can overload and destroy the
input current limitation of the controller:
– In the case of cyclic mains switching for a longer time period, allow at least one
minute between two switch−on actions!
Motor protection
ƒ Depending on the controller settings, the connected motor can be overheated by:
– For instance, longer DC−braking operations.
– Longer operation of self−ventilated motors at low speed.
Protection of the machine/system
ƒ Drives can reach dangerous overspeeds (e.g. setting of high output frequencies in
connection with motors and machines unsuitable for such conditions):
– The controllers do not offer any protection against such operating conditions. Use
additional components for this purpose.
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