Lenze E82xVxxxKxxxxx - Manual (Page 24)

Safety instructions
Residual hazards
3
l
24 EDS82EV903 EN 3.0
ƒ If you use the Selection of direction of rotation" function via the digital signal
DCTRL1−CW/CCW (C0007 = 0 ... 13, C0410/3
¹ 255):
– In the event of an open circuit or failure of the control voltage, the drive can
change its direction of rotation.
ƒ If you use the function "flying restart circuit" (C0142 = 2, 3) for machines with a low
moment of inertia and low friction:
– After controller enable at standstill, the motor can start for a short time or change
its direction of rotation for a short time.
Device protection
ƒ Frequent switching of the supply voltage (e.g. inching mode via mains contactor)
can overload and destroy the input current limitation of the controller:
– Wait for at least 3 minutes between two starting operations.
ƒ Only switch contactors in the motor cable when the controller is inhibited.
Otherwise ...
– monitoring functions of the controller can be activated.
– the controller can be destroyed under unfavourable operating conditions.
Motor protection
ƒ For some controller settings, the connected motor may overheat (e.g. when
operating the DC injection brake or a self−ventilated motor at low speed for longer
periods).
– Using an overcurrent relay or a temperature monitoring device provides a large
degree of protection against overload.
– We recommend to use PTC thermistors or thermal contacts for motor temperature
monitoring. (Lenze three−phase AC motors are equipped with thermal contacts
(NC contacts) as standard)
– PTC thermistors or thermal contacts can be connected to the controller.
ƒ Drives can attain dangerous overspeeds (e.g. setting of high output frequencies with
motors and machines not qualified for this purpose).