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60 Start-up
Start-up procedure
￭
Basic checks with no voltage connected
Action
Disconnect the drive from the AC power line and make sure it is safe to start the work. See section
Electrical safety precautions (page
Set the current trip limits of the main 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 applic-
ation.
General rule
Make sure that the selectivity condition is fulfilled, that is the breaker trips at the lower current than the
protection device of the supplying network, and that the limit is high enough 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 drive.
Peak current limit
Rule of thumb: Set to a value 3...4 times the rated AC current of the drive.
Make sure that the mechanical and electrical installation of the drive is completed. See
checklist (page
57).
Check the settings of breakers/switches in the auxiliary circuits.
Make sure that the voltage settings of the auxiliary voltage transformers (option +G344) are according
to the actual power line voltage. See the delivery-specific circuit diagrams.
Transformer [T21] is selected by option +G344; [T101] and [T111] are present if required by the options
specified by the customer.
￭
Starting and checking the cooling system
Action
Fill up and bleed the internal cooling circuit. Start the cooling unit up. See
cuit (page
79).
Check the cooling system for leaks.
Make sure that cooling circuit joints at the shipping split joining cubicles are tight and that all drain
valves have been closed.
Make sure that the coolant can flow freely in all cubicles.
Install all shrouds (if removed) and close the cabinet doors.
￭
Connecting voltage to input terminals and auxiliary
Action
Remove the temporary grounding system (if installed).
Drive with voltage meters (option +G334): Close the circuit breaker for the voltage meters [F5].
Close the circuit breakers supplying the auxiliary circuits [F20, F22.x].
Drive with an external control voltage supply (option +G307): Close the circuit breaker of the external
control voltage supply.
36).
Installation
Internal cooling cir-
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