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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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Reliance DC motor controller component info?
Have a failed Reliance "Jr. Pak-1000" 0.3KW DC motor drive. Note that this is
not Reliance USA, as in Rockwell, etc., but Reliance, Japan, which used to be part of Reliance Int'l, but no more. Symptom is that dc motor is not running smoothly at low speed setting (motor "jerks"), and doesn't reach top speed. Swapping motors and controllers indicates this controller is at fault. It consists of 3 basic components: - a PBF206 thyristor "H-bridge" - a 25cm^^3 cube-shaped module These two modules are in series with each other and with the load and the 230vac mains. Controlling these modules is a PCB which accepts a small (0-8vdc) speed control voltage and a speed-proportional feedback tachometer voltage (0-100vdc), and outputs control signals (via small conductors/molex plug) to both modules. The "mystery cube" is marked with simply "MC-0005G". No source logo or icon. I can't find any reference to such a part. Any help would be greatly appreciated. Thanks, -- DaveC This is an invalid return address Please reply in the news group |
#2
Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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Reliance DC motor controller component info?
On Tue, 11 Apr 2006 11:58:02 -0700, DaveC wrote:
Have a failed Reliance "Jr. Pak-1000" 0.3KW DC motor drive. Note that this is not Reliance USA, as in Rockwell, etc., but Reliance, Japan, which used to be part of Reliance Int'l, but no more. Symptom is that dc motor is not running smoothly at low speed setting (motor "jerks"), and doesn't reach top speed. Swapping motors and controllers indicates this controller is at fault. It consists of 3 basic components: - a PBF206 thyristor "H-bridge" - a 25cm^^3 cube-shaped module These two modules are in series with each other and with the load and the 230vac mains. Controlling these modules is a PCB which accepts a small (0-8vdc) speed control voltage and a speed-proportional feedback tachometer voltage (0-100vdc), and outputs control signals (via small conductors/molex plug) to both modules. The "mystery cube" is marked with simply "MC-0005G". No source logo or icon. I can't find any reference to such a part. Any help would be greatly appreciated. Thanks, -- DaveC This is an invalid return address Please reply in the news group You need to look at the field regulator, from Zero speed to base speed field should be max. After reaching base speed field voltage should start falling off. The tach signal of course should increase as speed increases, if there was a tach problem the motor would run ragged all the way to full speed. I recently helped someone with an identical problem and it turned on the field regulator was allowing the voltage to change causing rough operation. Regards Daveb |
#3
Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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Reliance DC motor controller component info?
Thus spake DaveB:
You need to look at the field regulator, from Zero speed to base speed field should be max. Field is fixed at ~100vdc. Output from common rect. bridge feeds fields of all 6 identical motors. After reaching base speed field voltage should start falling off. Not in this design; fixed field voltage. The tach signal of course should increase as speed increases, if there was a tach problem the motor would run ragged all the way to full speed. Tach signal was, at first, suspicious; it looks sawtooth, while all other motors put out steady speed-relative dc voltage. I marked this up to the jerking operation of the motor, resulting in a sawtooth tach voltage. Swapped motors and controllers, so this rules out: - motor - tachometer/generator (bolted onto motor) - wiring Thanks, -- DaveC This is an invalid return address Please reply in the news group |
#4
Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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Reliance DC motor controller component info?
DaveC wrote:
Have a failed Reliance "Jr. Pak-1000" 0.3KW DC motor drive. Note that this is not Reliance USA, as in Rockwell, etc., but Reliance, Japan, which used to be part of Reliance Int'l, but no more. Symptom is that dc motor is not running smoothly at low speed setting (motor "jerks"), and doesn't reach top speed. Swapping motors and controllers indicates this controller is at fault. It consists of 3 basic components: - a PBF206 thyristor "H-bridge" - a 25cm^^3 cube-shaped module These two modules are in series with each other and with the load and the 230vac mains. Controlling these modules is a PCB which accepts a small (0-8vdc) speed control voltage and a speed-proportional feedback tachometer voltage (0-100vdc), and outputs control signals (via small conductors/molex plug) to both modules. The "mystery cube" is marked with simply "MC-0005G". No source logo or icon. I can't find any reference to such a part. Any help would be greatly appreciated. Thanks, check for dried out electrolytic capacitors on the firing board. -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
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