Residual Hazards - Lenze L-force 9400 Mounting Instructions

2 Safety instructions

Residual hazards

2.2 Residual hazards
Protection of persons
Before starting work on the controller, check that the power terminals are
ƒ
deenergised
– because the power terminals U, V, W, +UG and -UG carry hazardous voltages for at
least 3 minutes after mains disconnection.
– because the power terminals U, V, W, +UG and -UG carry hazardous voltages when
the motor is stopped.
Device protection
Plug on or pull off all pluggable terminals only in deenergised condition!
ƒ
Detach the controllers from their installation backplanes only in deenergised
ƒ
condition!
Cyclically switching on and off of the mains voltage can overload and destroy the
ƒ
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
Depending on the controller settings, the connected motor can be overheated by:
ƒ
– For instance, longer DC-braking operations.
– Longer operation of self-ventilated motors at low speed.
Protection of the machine/system
Drives can reach dangerous overspeeds (e.g. setting of high output frequencies in
ƒ
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.
50

EDK94AMH24 DE/EN/FR/ES/IT 1.0