Connecting Voltage To Inverter Unit - ABB ACS880-107 Hardware Manual

Connecting voltage to inverter unit

The table below describes how to connect voltage to the inverter unit.
Action
WARNING! When connecting voltage to the supply unit, the DC busbars will become live, as will all
the inverters connected to the DC bus.
Make sure it is safe to connect voltage to the supply unit. Ensure that
• nobody is working on the unit or circuits that are wired from outside circuits to the drive system
• it is safe to start the motor
• the cabinet doors are closed.
WARNING!
Inverter units with a DC switch-disconnector:
Some types of inverter module may be energized through a charging circuit even when the DC
switch-disconnector is open or the DC fuses removed.
Inverter cubicles with frame R1i...R5i modules:
Before closing the main DC switch-disconnector of the cubicle, leave open the fuse disconnectors of those
inverter modules that need not be powered at this time. Do not open or close any fuse disconnectors under
load.
FRAME R1i...R7i INVERTER UNITS EQUIPPED WITH DC SWITCH-DISCONNECTORS (OR FUSE
DISCONNECTORS)
Close the DC switch/disconnector (or fuse disconnectors) of the
inverter units that are to be powered up.
Close the common DC switch/disconnector for all modules if the
cubicle is fitted with one.
FRAME (n×)R8i INVERTER UNITS EQUIPPED WITH MAIN DC SWITCH-DISCONNECTOR
These units are equipped with a charging circuit and can be connected to a powered DC bus. See below.
POWERING THE DC BUS
WARNING! Before closing the main contactor/air circuit breaker, make sure that sufficient inverter
power is connected to the intermediate (DC) bus.
As a rule of thumb,
• the sum power of the inverters connected must be at least 30% of the sum power of all inverters
• the sum power of the inverters connected must be at least 30% of the rated power of the brake unit (P
(if present).
If the above-mentioned rules are not followed, the DC fuses of the connected inverter units may blow, or the
brake chopper (if present) may be damaged.
Ensure that the number of inverters connected to the DC bus is
sufficient.
Close the main contactor (or breaker) of the supply unit.
FRAME (n×)R8i INVERTER UNITS EQUIPPED WITH MAIN DC SWITCH-DISCONNECTOR
Close the charging switch [Q10]. Wait until the green "charging
finished" lamp lights.
Close the DC switch/disconnector [Q2]. Open the charging switch
[Q10].
Start-up 101
Information
As soon as the DC bus is energized
later on in this procedure, the
capacitor banks of the inverter
modules are charged automatically.
See the WARNING above.
The DC bus is now powered, along
with all inverters that are connected
to it.
The DC capacitors of the modules of
the inverter unit are charged.
The inverter unit is now powered.
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