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Installing Nvr Switch With E-Stop - Problem!
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<blockquote data-quote="apprentice87" data-source="post: 367577" data-attributes="member: 13534"><p>A1 and A2 are either end of the solenoid coil that holds the contactor closed, or "on" if you like. A contactor has various terminals, the main ones for switching the load [your motor] and a pair of NO auxiliary ones 13 and 14. In the simplest way of doing things, these are wired in parallel to your push button "ON" switch.</p><p></p><p>You press the button and power is supplied to the coil, this closes the auxiliary switch, so that even when you take your finger off the button, the contactor stays closed, it has "latched" [as the auxiliary switch has bypassed the ON button]</p><p></p><p>The off button a [NC type], goes in the feed to the ON button, it is in series with the ON. As soon as you jab this, the feed to the coil is interrupted, and the contactor opens. Now, imagine there is a power cut. Coil is de-energised, and the contactor opens. When the power comes back on, nothing happens, as the switch 13/14 has popped open too, and is still open...</p><p></p><p>As to where A1 and A2 are connected, depends on the coil voltage and what you are doing..</p><p></p><p>You have found the coil A1. Now try to find which other terminal is connected to the other end of the coil and you should be on to a winner soon!</p><p></p><p>As Sidewinder said, the E stop should also be in the feed to the coil, NOT the feed to the motor. The E stop switches off the contactor, NOT the motor directly if you follow me...</p><p></p><p>john...</p><p></p><p>All you needed was a contactor wired up using the original switch on the lathe... Would have been cheaper and far better too..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 367577, member: 13534"] A1 and A2 are either end of the solenoid coil that holds the contactor closed, or "on" if you like. A contactor has various terminals, the main ones for switching the load [your motor] and a pair of NO auxiliary ones 13 and 14. In the simplest way of doing things, these are wired in parallel to your push button "ON" switch. You press the button and power is supplied to the coil, this closes the auxiliary switch, so that even when you take your finger off the button, the contactor stays closed, it has "latched" [as the auxiliary switch has bypassed the ON button] The off button a [NC type], goes in the feed to the ON button, it is in series with the ON. As soon as you jab this, the feed to the coil is interrupted, and the contactor opens. Now, imagine there is a power cut. Coil is de-energised, and the contactor opens. When the power comes back on, nothing happens, as the switch 13/14 has popped open too, and is still open... As to where A1 and A2 are connected, depends on the coil voltage and what you are doing.. You have found the coil A1. Now try to find which other terminal is connected to the other end of the coil and you should be on to a winner soon! As Sidewinder said, the E stop should also be in the feed to the coil, NOT the feed to the motor. The E stop switches off the contactor, NOT the motor directly if you follow me... john... All you needed was a contactor wired up using the original switch on the lathe... Would have been cheaper and far better too.. [/QUOTE]
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