Operating Instructions – MOVIDRIVE® MDR60A/61B
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10
General information
Safety Notes (MDR60A1320-503-00)
10
Safety Notes (MDR60A1320-503-00)
10.1 General information
This information is provided for installers and operators of a system and includes notes
regarding the special characteristics and regulations for the MOVIDRIVE
®
MDR60A1320-503-00 regenerative power supply unit. We do not claim that these safety
notes are complete.
10.1.1 Special features in comparison to the brake chopper
The regenerative power supply unit does not represent a constant drain, like a braking
resistor, but depends on the current conditions within the power supply system. Com-
mutation notches or voltage fluctuations in the supply system affect the reverse current
of the unit. The reverse current has to increase in case of a short-term system voltage
drop to still regenerate the required power. Drop of the supply voltage for an extended
period of time reduces the maximum power available for feedback. If only one phase
fails, the unit can still operate but the current in the remaining phases increases by a fac-
tor of 1.5.
10.1.2 Length of the DC connection
• Install the frequency inverter and the regenerative power supply unit as close as pos-
sible to each other.
• The permitted cable length between frequency inverter and regenerative power sup-
ply unit must not exceed 5 m.
• Route the cables very close to each other.
