Safety instructions
Residual hazards
2
14
Lenze ¯ MA 12.0014 ¯ 5.1
2.4 Residual hazards
Protection of persons
¯ Risk of burns!
– Hot surfaces up to 140 °C during operation! Provide protection against contact.
¯ Highfrequency voltages can be capacitively transferred to the motor housing
through the inverter supply.
– Earth motor housing carefully.
¯ Risk of injury due to rotating shaft!
– Before working on the drive system, ensure that the motor is at a standstill.
¯ 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.
¯ Dangerous voltages at the power terminals, even if the plug is removed: residual
voltage >60 V!
Motor protection
¯ 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.
¯ 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.
¯ Fuses are no motor protection.
– Use current−dependent motor protection switches at average operating
frequency.
– Use installed thermal detectors at high operating frequency.
¯ In the case of permanent−magnet motors, too high torques cause
demagnetisation.
– The maximum torques according to catalogue must not be exceeded.
¯ 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.
¯ Design with plug:
– Never disconnect plug when energised! Otherwise, the plug can be destroyed.
– Switch off power supply and inhibit controller prior to disconnecting the plug.
Fire protection
¯ Fire hazard
– Prevent contact with flammable substances.
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