Lenze 8400 protec Manual - Manual (Page 19)

Safety instructions
Residual hazards
2
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19 EDS84DPS424 EN 5.0
2.3 Residual hazards
Protection of persons
ƒ Before working on the controller, check if no voltage is applied to the power
terminals.
ƒ The operating temperature of the heatsink at the controller is very high. Skin
contact with the heatsink causes burns. If required, provide for protective covers.
ƒ Before working on the controller, check if no voltage is applied to the power
terminals because
– depending on the device − the power terminals U, V, W, Rb1, and Rb2 remain live
for at least 3 ... 20 minutes after disconnecting the mains.
– the power terminals L1, L2, L3; U, V, W, Rb1, and Rb2 remain live when the motor is
stopped.
Device protection
ƒ Frequent switching on of the mains voltage (e.g. inching mode via mains contactor)
may overload or destroy the controller.
Motor protection
ƒ Frequent switching on may overheat the connected motor.
ƒ Use PTC thermistors or thermostats with PTC characteristics to monitor the motor.
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.
ƒ Switch contactors in the motor cable only if the controller is inhibited.
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.
ƒ All unused connectors must be closed with protection covers or blanking plugs.