December 2001 Power Supply 3 – 25
The LE monitors the rectified voltage:
n An overvoltage up to 720 V is permissible for 5 seconds.
n Over 720 V, the NC prevents a pulse release for the IGBT of the power
module: the motors coast to a non-controlled stop and there can be no
energy recovery to the dc link.
n Below 385 Vdc (powerfail) all drives are brought to a controlled stop; the
control must be switched off and on again.
n Below 155 Vdc, the control is reset (RESET).
n At 135 Vdc, the dc-link power supply switches off.
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