Residual Hazards - Lenze 8400 Hardware Manual

2 Safety instructions

Residual hazards

2.3 Residual hazards
Protection of persons
Before working on the controller, check that no voltage is applied to the power
ƒ
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
Connect/disconnect all pluggable terminals only in deenergised condition!
ƒ
Detach the controllers from the installation, e.g. from the rear panel of the control
ƒ
cabinet, only in deenergised condition!
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.
Switch contactors in the motor cable only if the controller is inhibited.
ƒ
When switching contactors in the motor cable while the controller is enabled, you can
activate monitoring functions of the controller. If no monitoring function is activated,
switching is permissible.
Parameter set transfer
During the parameter set transfer, control terminals of the controllers can adopt
ƒ
undefined states!
– Therefore, it is absolutely necessary to remove control terminal X4 (digital input
signals for devices of the StateLine C version) or control terminal X5 (digital input
signals for devices of the HighLine C/TopLine C version). This ensures that the
controller is inhibited and all control terminals have the firmly defined "LOW"
status.
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EDS84ASC552 EN 10.0