Thyristor Converters - Mk-iii

Mysore-based Kirloskar Electric manufactures Thyristor converters, MK-III. These are are useful for various process applications in steel, paper, textile and material handling areas. These converters use single-phase fully controlled thyristor bridges. In most applications the bridge is used to control the armature voltage. These converters feature built-in isolation amplifier for armature voltage feedback. Electrical specifications are as follows:

MK-III min drive modules are rated up to 30 Amps

? Input supply: 240V, Single phase, 50 Hz or, 415V line-line, 50 Hz supply with voltages of 10 percent and frequency variation of 3 percent
? Armature voltage: suitable for DC motors of armature with voltage supply of 180V or 320V when operating on line-neutral or line-line supply, respectively
? Field supply: 240V, single-phase 50Hz input, 200V DC at maximum 2A DC output
? Speed range: 1:10 by armature voltage control at constant torque Speed regulation: +/-1 percent with tacho feedback [dependent on type of tacho used] or +/-3 percent with armature voltage feedback, at base speed
? Standards applicable: IEC - 146, Class - 1 duty

Features and protection:
? Controlled acceleration facility
? IR compensation in case of armature voltage feedback
? Adjustable current limit
? Metal oxide varistors for surge suppression
? Instantaneous over load
? Field failure
? Armature over voltage
? Tacho fail
? External fault reset facility
? Adjustable trimports for instantaneous over load, current limit, maximum speed, minimum speed, gain, IR compensation, field fail, acceleration, deceleration, over voltage, stability, and inch reference
? Status indicating multicolour LED bar graph for power supply [+15V and -15V], precondition, trip, field failure, current limits, instantaneous over current, over voltage, tacho fail, and run