ABB ACS880-304 +A018, Hardware Manual

Page: 114 / 280

114 Start-up
Start-up procedure
The instructions in this manuals are not suitable for the start-up work as such. They are
valid for the example supply unit only and intended for the starting point for the final start-
up instructions. The designer of the cabinet-installed drive must:
•
prepare the final start-up instructions
•
provide the final start-up to the start-up engineer/electrician.
Have the final circuit diagrams and start-up instructions by the designer of the cabinet-
installed drive at hand before you do the start up.
Action
Basic checks with no voltage connected
Make sure that the disconnector of the supply transformer is locked to the off (0) position, that means
no voltage is, or cannot be connected to drive inadvertently.
Disconnect the drive from the AC power line and make sure it is safe to start the work. Obey the
instructions in section
Basic electrical safety precautions on page 96 .
If the supply unit is equipped with a main breaker [Q1], make sure that it is disconnected:
• The breaker is locked in withdrawn position (racked out).
If the supply unit is equipped with a main switch-disconnector [Q1]:
• make sure that it is open.
If the supply unit is equipped with a main switch-disconnector [Q1] and contactor [Q2]:
• open first the main contactor, and then the main switch-disconnector.
If the unit is equipped with a main breaker, set the current trip limits of the breaker. The trip limits have
been preset to generic values by the breaker manufacturer. The generic limits do not correspond the
protection requirements of the application.
For the limit rules, see below.
General rule
Make sure that the selectivity condition is fulfilled, that is the breaker trips at a lower current than the
protection device of the supplying network, and that the limit is high enough not to cause unnecessary
trips during the intermediate DC circuit load peak at start.
Long term current limit
Rule of thumb: Set to the rated AC current of the module.
Peak current limit
Rule of thumb: Set to a value 3…4 times the rated AC current of the module.
Make sure that the installation has been checked. See chapter Installation checklist on page 111 .
Check the settings of breakers/switches in the auxiliary circuits. See the final circuit diagrams by the
designer of the cabinet-installed drive.
If time relays, or relays with delayed make contact or break contact are used in emergency stop
circuits, check the relay time settings. See the final circuit diagrams by the designer of the cabinet-
installed drive.
Check the voltage settings of the auxiliary voltage transformers (if any) are according to the actual
power line voltage. See the final circuit diagrams by the designer of the cabinet-installed drive.
Disconnect the unfinished or unchecked 230 V AC cables that lead from the terminal blocks to the
outside of the equipment.
Check that both circuits of STO terminals on the control unit are closed as shown in Default I/O
connection diagram of the supply unit on page 232 (IN1 and IN2 must be connected to OUT). The
supply unit cannot start is either circuit is open.