Starting Tsu Or Dsu; Double Roof - ABB ACA 6 Series Hardware Manual

Starting TSU or DSU

Double Roof

ACS 600 MultiDrive
Note the warning below before starting drives equipped with a Thyristor
or Diode Supply Section.
WARNING! Before power switch-on, make sure that a sufficient
inverter power is connected to the intermediate circuit. Rules of thumb:
1. The sum power of the inverters connected must be at least 30% of
the sum power of all inverters.
2. The sum power of the inverters connected must be at least 30% of
the rated power of the braking section (P
If the above mentioned rules are not followed, the DC fuses of the
connected inverter(s) may blow or the braking chopper (if used) may
be damaged.
The phenomena which result in a fuse blow are as follows:
• At start, a charging current high enough for charging all the
inverters flows to the connected ones.
• In Thyristor Supply Sections, the DC voltage may overshoot the
controller bridge change limit, causing an immediate change to
regeneration and a high reverse current.
• The DC voltage may overshoot the braking chopper controller
voltage limit, causing an immediate switching into braking mode
and a high braking current, which in turn discharges low power
inverter capacitors.
The braking chopper may be damaged by repeated on-off switching of
the braking due to a high supply and braking section power compared
to the inverter power.
If the drive is equipped with a double roof, ensure that the roof is lifted
up from the transportation position to enable the cooling air flow before
starting the drive.
1
Safety Instructions
) if present.
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