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johnbose
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Electrical and electonics engineer with 15 years experience in process industry
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Joined: 10-November 05
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Last Seen: 4th March 2006 - 02:51 PM
Local Time: Dec 3 2008, 07:09 AM
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28 Nov 2005
WE have lot of Telemechanique LC1D09 to LC1D38 contactors in the MCCs . The coil voltage is 220V .Control wiring is standard wiring with Start stop buttons located in the field and hold on contact across start button. Many drives which have long control cables do not stop on pressing the stop. We find that the contactors do not drop off till below 80V across the coil, once picked up. Since the current in picked up state is as low as 14mA at about 100V, the motor contactors holding are on due to induced voltages on long (300- 500m ) cable cores as we are using 220V AC control supply. CAn ANYONE SUGGEST / advise how to overcome this problem. We have already tried the following with no success
1. Addition of RC ( 100ohm +470uF) across coil 2. Using a coil of 240V AC rating |
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Lo-Fi Version | Time is now: 2nd December 2008 - 11:09 PM |
