Lenze ECSxK series - Manual (Page 12)

Safety instructions
Residual hazards
2
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12 EDBCSXKXXX EN 1.0
2.2 Residual hazards
Protection of persons
ƒ Before working on the capacitor module, check that no voltage is applied to the
power terminals,
– because the power terminals +UG and -UG at the supply module remain live for at
least 3 minutes after mains switch-off.
– because the power terminals +UG and -UG remain live when the motor is stopped.
ƒ If an error occurs (short circuit to frame or earth fault) a DC residual current may
occur in the PE conductor. If an earth-leakage circuit breaker (residual current
device) is used to protect against direct or indirect contact, only the use of an
earth-leakage circuit breaker of type B is permissible on the current supply side. If
not, another protective measure is to be used, as for example, separation from the
environment by double or reinforced insulation or separation from the mains by
using a transformer.
Device protection
ƒ All pluggable connection terminals must only be connected or disconnected when
no voltage is applied.
ƒ The power terminals +UG, -UG and PE are not protected against polarity reversal.
– When wiring, observe the polarity of the power terminals.
ƒ The power may only be converted if the power supply module in the power system
is ready for operation and the charging current limitation is bridged. Otherwise the
charging current limitation can be destroyed.
ƒ If the charging current limitation is active, a cyclic switching of the mains voltage at
the power supply module can overload and destroy the capacitor. Therefore, at least
three minutes have to pass between two starting operations in case of cyclic mains
switching over a longer period of time.
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