Lenze E82xVxxxKxxxxx - Manual (Page 23)

Safety instructions
Residual hazards
3
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23 EDS82EV903 EN 3.0
3.2 Residual hazards
Protection of persons
ƒ According to their enclosure, Lenze controllers (frequency inverters, servo inverters,
DC speed controllers) and their components can carry a voltage, or parts of the
controllers can move or rotate during operation. Surfaces can be hot.
– If the required cover is removed, the controllers are used inappropriately or
installed or operated incorrectly, severe damage to persons or material assets can
occur.
– For more detailed information please see the documentation.
ƒ There is a high amount of energy within the controller. Therefore always wear
personal protective equipment (body protection, headgear, eye protection, ear
protection, hand guard) when working on the controller when it is live.
ƒ Before working on the controller, check if no voltage is applied to the power
terminals.
– the power terminals U, V, W, +UG, −UG, BR1 and BR2 still carry dangerous voltage
for at least 3 minutes after power−off.
– the power terminals L1, L2, L3; U, V, W, +UG, −UG, BR1 and BR2 carry dangerous
voltage when the motor is stopped.
– the relay outputs K11, K12, K14 can carry dangerous voltage when the drive
controller is disconnected from the mains.
ƒ Before power−off during DC−bus operation, all controllers must be inhibited and
disconnected from the mains.
ƒ The discharge current to PE potential is > 3.5 mA. In accordance with EN 61800−5−1
– a fixed installation is required.
– the design of the PE conductor has to be double or, in the case of a single design,
must have a cable cross−section of at least 10 mm 2 .
ƒ The controller can only be safely disconnected from the mains via a contactor on the
input side.
ƒ Controllers can cause a DC current in the PE conductor. If a residual current device
(RCD) or a fault current monitoring unit (RCM) is used for protection in the case of
direct or indirect contact, only one RCD/RCM of the following type can be used on
the current supply side:
– Type B for the connection to a three−phase system
– Type A or type B for the connection to a single phase system
Alternatively another protective measure can be used, like for instance isolation from
the environment by means of double or reinforced insulation, or isolation from the
supply system by using a transformer.