Lenze EVF9338−EV - Manual (Page 13)

Safety instructions
Residual hazards
2
l
13 EDKVF93−04 EN 2.0
2.2 Residual hazards
Protection of persons
ƒ Before working on the controller, check that no voltage is applied to the power
terminals:
– The power terminals U, V, W, +U
G
, −U
G
, BR1, BR2 and 101 ... 104 remain live for at
least five minutes after disconnecting from the mains.
– The power terminals L1, L2, L3, U, V, W, +U
G
, −U
G
, BR1, BR2 and 101 ... 104 remain
live when the motor is stopped.
ƒ The leakage current to earth (PE) is >3.5 mA. EN 50178 requires a fixed installation.
ƒ The heatsink of the controller has an operating temperature of > 80 °C:
– Direct skin contact causes burns.
ƒ During the parameter set transfer, the control terminals of the controller can
assume undefined states.
– For this reason, the connectors X5 and X6 have to be unplugged before the
transfer is executed. This ensures that the controller is inhibited and all control
terminals are in the defined state LOW".
Device protection
ƒ Frequent mains switching (e.g. inching mode via mains contactor) can overload and
destroy the input current limitation of the controller.
– Thus, at least five minutes have to pass between two switch−on processes.
– In case of frequent, safety−related disconnections use the "safe torque off" safety
function (STO).
Motor protection
ƒ Certain drive controller settings can overheat the connected motor:
– E. g. long−time operation of the DC injection brake.
– Long−time operation of self−ventilated motors at low speeds.
Protection of the machine/system
ƒ Drives can reach dangerous overspeeds (e. g. setting of high output frequencies in
connection with motors and machines not suitable for this purpose):
– The drive controllers do not provide protection against such operating conditions.
For this purpose, use additional components.