Lenze MDxMA-MHxMA-MFxMA-MDERA-MHERA Three-phase AC motors - Manual (Page 12)

Safety instructions
Residual hazards
2
l
12 BA 33.0005−EN 2.0
2.4 Residual hazards
Protection of persons
ƒ The motor surfaces can become very hot. Danger of burns when touching!
– Provide protection against accidental contact, if necessary.
ƒ Highfrequency voltages can be capacitively transferred to the motor housing
through the inverter supply.
– Earth motor housing carefully.
ƒ Danger of unintentional starting or electrical shocks
– Connections must only be made when the equipment is deenergised and the
motor is at standstill.
– Installed brakes are no fail−safe brakes.
Motor protection
ƒ Installed thermal detectors are no full protection for the machine.
– If required, limit the maximum current, parameterise the controller such that it
will be switched off after some seconds of operation with I > I
N
, especially if there
is the danger of blocking.
– Installed overload protection does not prevent an overload under any conditions.
ƒ Installed brakes are no fail−safe brakes.
– The torque can be reduced due to disruptive factors that cannot be influenced, e.g.
by ingressing oil due to a defect shaft sealing ring on the A side.
ƒ Fuses are no motor protection.
– Use current−dependent motor protection switches at average operating frequency.
– Use installed thermal detectors at high operating frequency.
ƒ Too high torques cause a fraction of the motor shaft.
– The maximum torques according to catalogue must not be exceeded.
ƒ Lateral forces from the motor shaft may occur.
– Align shafts of motor and driving machine exactly to each other.
ƒ If deviations from normal operation occur, e.g. increased temperature, noise,
vibration, determine the cause and, if necessary, contact the manufacturer. If in
doubt, switch off the motor.
Fire protection
ƒ Fire hazard
– Prevent contact with flammable substances.