ABB MNS R, Installation Manual

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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