720456 – OVERTEMP CONTROLLER FOR NC CABINETS

Description

720456 – Overtemp Controller for NC Cabinets – Works with all Atotech USA, Atlas and Auto Technology Company cyclic corrosion test chambers (CCT).    PURPOSE:  The purpose of the over-temperature controller is to act as a safety switch if the cabinet controls do not, or  cannot shut off the cabinet heater during a heating cycle. This backup controller will turn off power to  the cabinet heater if the exposure zone reaches 75ºCor above.    LOCATION:  The over-temperature controller is located on the electrical panel under the control top cover on the right  side.    FUNCTION:  The over-temperature controller controls the  control voltage to CON1. The only purpose for  CON1 is to supply voltage to the cabinet heater solid state relays (SSR). If an SSR fails, it usually fails  leaking voltage. If this occurs, the cabinet controller has no way of turning off the SSR. In such a  condition, the cabinet controls will turn off CON1, thus cutting off the supply of voltage to the SSR,  stopping the ability for the heater to heat since all voltage is OFF. In the event the cabinet controls have  malfunctioned and cannot turn off CON1, this over temperature controller takes over. The overtemperature  controller has a dedicated RTD to send it a signal. If the temperature reaches the alarm set  point (set at the factory for 75ºC) this controller will OPEN output 2 (the alarm contact) When this output  opens, the control voltage to CON1 is turned OFF, stopping the supply of voltage to the SSRs. This  alarm latches on and must be manually reset if activated.