GE DSXH47EG Technical Service Manual

Also see for DSXH47EG: Dimensions and installation information Dimensions and installation information Dimensions and installation information Owner's Manual & Installation Instructions Tech manual

Contents

GE DSXH47EG Technical Service Manual Manual pdf 17 page image

17Drive Motor Circuit:When power is connected to the dryer, line 1 is appliedthrough the thermal limiter (a non-resettable fusemounted on the rear wall of the dryer) to the COM terminalof the door switch.When the door is closed the COM terminal is connectedto terminal NO of the door switch. From terminal NOpower is applied to terminal J4-2 of the motor relay RL1 on the control board. When the control board closesrelay RL 1 power is applied through terminal J4-1 toterminal M4 of the drive motor.Terminal M4 is connected inside the motor to one sideof the thermal overload. (The thermal overload protectsthe motor from being damaged by overheating.) Theother side of the thermal overload is connected to oneend of both the run winding and the start winding of thedrive motor. When the motor is not turning, the otherend of the start winding is connected internally toterminal M5 of the motor through the NC contact of themotor centrifugal switch. The other end of the runwinding is also connected internally to terminal M5,which is connected to neutral.When the motor is not turning, the start winding andthe run winding are connected in parallel. When thecontacts of relay RL 1 are closed, with the dryer doorclosed, line 1 and neutral voltage is applied across boththe start and run windings of the drive motor. With powerapplied to both the start and run windings, the motorstarts to turn.When the speed of the motor reaches about 80% ofit’s normal run speed, the contacts of the centrifugalswitch remove power from the start winding thus removingthe start winding from the circuit.The drive motor preforms two tasks in the dryer. A pulleyattached to one end of the motor shaft uses a belt todrive the dryer drum. The blower wheel is attached to theother end of the motor shaft to pull the air through theclothes and force it out the exhaust vent.Temperature Sensing Circuit:The temperature in the dryer is controlled by the controlthermistor and the electronic control board. The controlthermistor, mounted in the blower fan housing, is anegative coefficient thermistor that decreases inresistance as the temperature increases.The electronic control board reads the resistance ofthe thermistor and converts it to temperature. It comparesthe reading from the thermistor to the temperature settingfor the cycle.The Heating Circuit:The electronic control board applies power to theheating circuit through the contacts of heater relay RL2. When the electronic control senses the temperaturein the drum is below the programmed temperature, itcloses the contact of RL 2. This applies line 1 power tothe high limit thermostat mounted on the heatingelement assembly.