Tfoubleshooting Cont.
In the eventmore than one solid statecontrolfails at the sametime, the line voltagesupptyto the controlis suspect.Checkfor anyblown varistorsacrosstheouput terminalsof theControl.Thisis a goodindicationof a powerspikeon oneof thephaselinesto thegriddle
The controlis designedto operate,witha maximumheatsinktemperatureof 7fC. If the control exceeds70oC,eitherthecontrol'sthermalcompoundhasbeenimproperlyappliedorthetemperaturein thecompartmenthasexceededmaximumambient.In additionto improperlyinstalledcontrols,check for hot adjacentequipment,impropertyinstalledinsulationundertheelentents,or otherheatcontrib- utingconditions.
B.Replacement
Properreplacementof the solid statecontrolis essentialfor properperformance.Beforeinstalling the control,besureto cleanoff all of theold thermalcompoundleft behindfrom the old control. Always usenewtherrnalcompoundwhenreplacingthesolidstatecontrol.Useof'thespecialoil basedthermal compound(silicone)is an importantandmandatorystepthat allows for properheattransferfrom the controlto the metalplateorl which it is mounted. The.thermalcompoundis to be appliedto the underside(metalside)of the controlasa thin film approximately.001inch (0A254cm). Toomuch compoundwill deterratherthanhelp to transferawaythe heatgeneratedby the control'sthyristor. Purchasethe compoundunderTM PartNumber3103116.
For wiring referenceto the control, seeFigure1below.
Thebaseplatemountingscrewsshouldbetightenedto .15inch poundsfor exactcontactto the surface. The load terminalsshouldbe torquedto 10 inch lbs whe:rsecuringthe terminal connectionsof the wires.
Always replaqpthevaristoracrossthehighvoltageoiitput terminalson the control.whenchangingthe control. The varistorprovidesproctoctionfrom voltagespikesasthe tyristor switchesthe poweron andoff. Thevoltagetolprariceon the loadterminalsof the controlis 20 - 300 VoltsRMS andthe load
terminalamperageis 40 AmpsRMS. | ACOutput |
Thermocouole
A
On/Off FromPotentiometer
