SALIENT FEATURES :
ADTRON’S DC Motor Speed Control Demonstration Unit is a versatile stand alone unit useful in the study & demonstration of the principle & working of a DC Motor Speed Control. The circuit consists of a ramp generator, comparator, pulse transformer isolated trigger circuit with short circuit, overload protection & field failure protection. The unit can be operated in three modes namely, armature feedback, open loop & tacho feedback. A 3pin socket for CRO is also provided for isolation. It is housed in an elegant metal cabinet with a well spread intelligently designed circuit layout on front panel. Multi – coloured test points are provided at various stages in the circuit to observe voltages & waveforms.
TECHNICAL SPECIFICATIONS
* Input : 230V, 50Hz AC 1φ.
* Output : Variable DC ( 0 – 230V ).
* Circuitry : Ramp generator, Comparator, short circuit, overload protection circuit & pulse transformer isolated trigger circuit.
* Power Circuit : Using 2 SCR’s ( 1200V, 25A ) ( i.e. Half bridge ).
* Feedback : 1. Armature.
2. Tacho.
* Protection : 1. Overload.
2. Short circuit
3. Field failure.
* Controls : 1. Speed.
2. Armature – open loop – Speed measurement feedback selector switch.
* Indicator : 1. Drive ON.
2. +12V.
3. -12V.
4. Trip.
5. Mains ON.
* Socket : 1. 8 pin socket for connecting motor & tacho.
2. 3 pin socket for CRO.
* Display : 1. 3 ½ digit to indicate armature current.
2. 3 ½ digit to indicate armature voltage.
3. 3 ½ digit to indicate RPM.
* Motor : 1 HP DC Motor with speed measurement unit & loading arrangement.
* Experiment :
1. Study of firing circuit.
2. Speed control of DC motor with armature feedback.
3. Speed control of DC motor with tacho feedback.