ABB MNS R - Start up

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1TTS900001M0902
4.6 Start up
Before starting the switchboard, perform the inspection detailed in the following table.
ITEM OPERATION Note
1. Compartment • Visuallyinspectinternaland
external parts for any possible
evident damage; remove any
foreign material (i.e. test tools left
after the assembly)
• Carefullycleantheinsulating
parts, remove any trace of damp
• Removedustordirtfromtheair-
intake grilles
2. Power circuit connections Check the tightening and the
continuity
3. Earth busbar and related connections Check the tightening and the
continuity
4. Insulation Measure the insulation resistance of
the auxiliary power circuits (phase-
phase and phase-earth) and of the
anticondensate heater.
The measured value must be at
least > 100 Mohm
• Theinsulationresistance
value is strongly influenced
by environmental conditions
• Theswitchboardmust
NOT be put in service if the
insulation resistance is too
low, for example inferior to
1 Mohm
• Iftheinsulationresistance
low value is due to
humidity, activate the
anticondensate heater
(after having performed the
inspections described in
step 8, and possibly taking
the thermostat to the higher
value); if necessary use also
provisional heaters
5. Circuit breakers • Beforeputtinginservice,carry
out all necessary operation
described in the instructions
related to each circuit breaker
• Checkthenecessarydevicesand
the accessories for the operation;
in case of key-locked circuit
breaker (open or closed), each
circuit breaker must be equipped
with only one key
• Putthecircuitbreakersintothe
service position
6. Protective release device Check the correct calibration
according to the selective
diagrams of the plant