5.2 Electrical mains connections
GHN (basic, auto), GHND (basic, auto) pumps are provided with built-in, three
phase electric motor, to be connected with A.C. mains of 3~400 V, 50Hz.
GHNM (basic, auto), GHNMD (basic, auto) type pumps have built-in, single
phaseelectricmotor1x230V,50Hz.
The motor is internally protected with bimetal switch. The electric motor
haveabuilt-in,thermalcutout,thatwillswitchofftheelectricmotorwhenitis
overheated.
The fuse forisolation ofall polesfrom the mains should be incorporated in
accordance with the national electrical installation standards.
ThemotorprotectionswitchIskraMISMS25,SchrackALEAorsimilarswitches
areappropriatefuses.
The connecting wire has to be connected over a cable entry M20 (Fig.2 –
POS.7).
- Allwaterconnectionsmustbeinstalledatalevelatwhichthepipelineand/orhydraulic
casingofthepumpand/ormotorcasingarenotooded.
- Check that the mains voltage agree with the particulars stamped on the rating plate.
- Fuseonthesideofmains:pleaserefertotheratingplate.
- Thepump/systemmustbeearthed(grounded)inaccordancewiththeappropriate
standards.
5.2.1 Electrical connection of pumps
Electrical connections of the pump must be carried out in accordance with the wiring
diagram(Fig.4),attachedonthebottomofmotorcover.Beforedoingthatunwindthe
uppercover(Fig.2-POS.2).
Fig.4
6.1 Loading and deaeration
In the pumps of types GHN (basic auto), GHND (basic, auto), GHNMD (basic, auto),
GHNMD (basic, auto) the rotor is submerged and provided with special water-lubricated
bearings. Before putting the pump into operation, it has to be lled with water and
deaerated.Deaeratethepumpbyunscrewingascrewonthebacksideoftheelectric
motor(Fig.2-POS.5).Airwillowoutthroughthecleftbetweenthemotorshaftandthe
bearing.Whenwaterstartstoowout,closethevalvesatboththesuctionandpressure
sideofthepump.Startthepumpandcheckthedirectionofshaftrotation.Incaseofa
wrongdirectionabuilt-inashlampwillstarttoblinkwithredlight.
Thepumpisalsoprovidedwithotherdetectorsforidentifyingerrors,listedinthetablebelow.
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