SALIENT FEATURES :
ADTRON’S DC Drive Demonstrator is a versatile standalone unit useful in the study & demonstration of the principle & working of a DC drive. The circuit consists of a ramp generator, comparator, pulse transformer trigger circuit, dynamic breaking resistor, contactor, short circuit, overload & field failure protection. The unit can be operated in five modes, namely, Forward, Reverse armature feedback, open loop, tacho feedback. A 3 pin 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. Multicoloured test points are provided at various stages in the circuit to observe voltages & waveforms.
TECHNICAL SPECIFICATIONS
* Input : 230V, 50Hz AC 1f.
* Output : Variable DC ( 0 – 230V ).
* Circuitry : Ramp Generator, Comparator, Pulse transformer trigger circuit, Dynamic breaking resistor, Contactor, Short circuit, Overload, & Field failure protection.
* 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. Direction ( Forward / Reverse ) selector switch.
3. Feedback ( Armature – open loop – Tacho 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 tacho & 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.
4. Forward reverse operation with dynamic breaking.