Lenze 8200 vector 15kW-30kW - Manual (Page 9)

Safety instructions
Residual hazards
1
l
9 EDK82EV303 EN 1.0
Maintenance and servicing
The controllers do not require any maintenance, if the prescribed conditions of operation
are observed.
If the ambient air is polluted, the cooling surfaces of the controller may become dirty or the
air vents of the controller may be obstructed. Therefore, clean the cooling surfaces and air
vents periodically under these operating conditions. Do not use sharp or pointed tools for
this purpose!
Disposal
Recycle metal and plastic materials. Ensure professional disposal of assembled PCBs.
The product−specific safety and application notes given in these instructions must be
observed!
1.2 Residual hazards
Protection of persons
ƒ Before working on the drive controller, check whether all power terminals, the relay
output, and the pins of the FIF interfaces are deenergised, because
– the power terminals U, V, W, +U
G
, −U
G
still carry dangerous voltage for at least 3
minutes after power−off.
– the power terminals L1, L2, L3, U, V, W, +U
G
, −U
G
carry dangerous voltage when the
motor is stopped.
– the relay outputs K11, K12, K14 and K21, K22, K24 can carry dangerous voltage if
the drive controller is disconnected from the mains.
ƒ If you use the selection of direction of rotation" via function which is not fail−safe
against open circuit via the digital signal DCTRL1−CW/CCW (C0007 = 0 ... 13,
C0410/3
¹ 255):
– In case of open circuit or failure of the control voltage, the drive may change the
direction of rotation.
ƒ If you use the "flying restart circuit" function (C0142 = 2, 3) for machines with a low
moment of inertia and low friction:
– After controller enable in standstill, the motor may start for a short period of time,
or may temporarily change the direction of rotation.
ƒ The operating temperature of the heatsink on the drive controller is > 80 °C:
– Skin contact with the heatsink causes burns.
ƒ Drive controllers with the "safe standstill" function:
In case of short circuit of two power transistors, a residual movement of up to
180°/number of pole pairs may result on the motor.
– With regard to a 4−pole motor, for instance, the residual movement can be
maximal 180°/2 = 90°. When effecting the hazard analysis, the user has to take
this residual movement into account (e. g. safe standstill for main spindle drives).