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#1
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Relay problem
I have a light that refuses to go on.
The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? |
#2
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Relay problem
Meat Plow wrote:
On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. |
#3
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Relay problem
Mike wrote:
Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Do you know where the low voltage source running through the switch comes from? More details please... Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.98*10^14 fathoms per fortnight. |
#4
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Relay problem
No, if A&B are the 24 volt coil terminals, you should get a 24 volt reading
on your meter across those two terminals, when the switch is on, unless it's a momentary contact ratchet relay, then you'll only get voltage at the coil while you hold the switch on "Mike" wrote in message ... Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. |
#5
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Relay problem
Jeff Wisnia wrote:
Mike wrote: Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Do you know where the low voltage source running through the switch comes from? More details please... Jeff When I put the probes on A and B and switch lights on (I am testing on a similar light set up as the problem one) the meter momentarily shows to 24V and then goes to zero. Same thing with switching off. I can't figure why? Do I have a problem with me meter. It has worked fine otherwise. |
#6
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Relay problem
Mike wrote:
Jeff Wisnia wrote: Mike wrote: Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Do you know where the low voltage source running through the switch comes from? More details please... Jeff When I put the probes on A and B and switch lights on (I am testing on a similar light set up as the problem one) the meter momentarily shows to 24V and then goes to zero. Same thing with switching off. I can't figure why? Do I have a problem with me meter. It has worked fine otherwise. Questions: Are the "switches" normal toggling ON-OFF types or are they some sort of momentary push buttons? From what you just wrote, the control voltage might just be DC and not AC and you have your meter set to measure AC voltage. That could account for the meter momentarily "jumping" to 24 volts when the coil is energized OR deenergized with DC voltage. Try setting your meter for DC measurements, try again, and report back. Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.98*10^14 fathoms per fortnight. |
#7
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Relay problem
On Nov 17, 11:50 am, Mike wrote:
I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? Um, the first question, everyone didn't ask. Is there only "one" light or does this circuit feed several lights? If there is more than one light on the circuit and only one is dead, the 240 volt reading between C and D is through the filaments or ballasts of the other lights. If that's the case, look at the socket or connections for the dead light. [8~{} Uncle Monster |
#8
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Relay problem
Jeff Wisnia wrote:
Mike wrote: Jeff Wisnia wrote: Mike wrote: Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Do you know where the low voltage source running through the switch comes from? More details please... Jeff When I put the probes on A and B and switch lights on (I am testing on a similar light set up as the problem one) the meter momentarily shows to 24V and then goes to zero. Same thing with switching off. I can't figure why? Do I have a problem with me meter. It has worked fine otherwise. Questions: Are the "switches" normal toggling ON-OFF types or are they some sort of momentary push buttons? From what you just wrote, the control voltage might just be DC and not AC and you have your meter set to measure AC voltage. That could account for the meter momentarily "jumping" to 24 volts when the coil is energized OR deenergized with DC voltage. Try setting your meter for DC measurements, try again, and report back. Jeff They are normal on-off type. I tried for DC with same result. I believe now that my meter does not measure correctly. |
#9
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Relay problem
Mike wrote:
Jeff Wisnia wrote: Mike wrote: Jeff Wisnia wrote: Mike wrote: Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Do you know where the low voltage source running through the switch comes from? More details please... Jeff When I put the probes on A and B and switch lights on (I am testing on a similar light set up as the problem one) the meter momentarily shows to 24V and then goes to zero. Same thing with switching off. I can't figure why? Do I have a problem with me meter. It has worked fine otherwise. Questions: Are the "switches" normal toggling ON-OFF types or are they some sort of momentary push buttons? From what you just wrote, the control voltage might just be DC and not AC and you have your meter set to measure AC voltage. That could account for the meter momentarily "jumping" to 24 volts when the coil is energized OR deenergized with DC voltage. Try setting your meter for DC measurements, try again, and report back. Jeff They are normal on-off type. I tried for DC with same result. I believe now that my meter does not measure correctly. Could be... Try your meter when set to DC by measuring a 9 volt "transistor radio" battery and see if it reads somewhere around the right voltage. Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.98*10^14 fathoms per fortnight. |
#10
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Relay problem
Jeff Wisnia wrote:
Mike wrote: Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Not all relays make an audible click. Do you know where the low voltage source running through the switch comes from? More details please... Jeff -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#11
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Relay problem
On Nov 18, 1:06 am, Mike wrote:
Jeff Wisnia wrote: Mike wrote: Jeff Wisnia wrote: Mike wrote: Meat Plow wrote: On Sat, 17 Nov 2007 19:50:55 +0200, Mike wrote: I have a light that refuses to go on. The light switch (wall type) is connected to a relay. Now the relay won't "click". It used to work a couple of days ago. The relay has operating voltage of 24V which switches a 240V line (lights). I would like to test (using a voltmeter) where I'm having problems. How do I measure if 24V is going through the coil/magnet. The relay box looks like this (wires go to points A,B,C,D): A 24V b ------------- | | | | | | | | | | C------------D 240V When the switch is off volmeter shows 240V between C and D When the switch is on volmeter shows 0V between C and D How do I measure voltage in A and B? If C and D drops to zero then I would assume the relay is closing. The voltage on A and B should be 24 volts when the switch is on. Thanks for the quick reply. The relay is rated 24V-8V. I'd like to know what I am getting. What if I (using my voltmeter) connect A or B to ground Should I then get 24V on my meter. Not neccessarily, unless A or B happens to also be grounded, which would not necessarily represent a fault. Put your meter probes across A and B. You will probably read zero when the switch is OFF and should read 18 to 24 volts when it's ON. If you get the 18-24 volts with the switch ON, but no "click", yet C and D drops to zero as you say, then I'm missing something. Do you know where the low voltage source running through the switch comes from? More details please... Jeff When I put the probes on A and B and switch lights on (I am testing on a similar light set up as the problem one) the meter momentarily shows to 24V and then goes to zero. Same thing with switching off. I can't figure why? Do I have a problem with me meter. It has worked fine otherwise. Questions: Are the "switches" normal toggling ON-OFF types or are they some sort of momentary push buttons? From what you just wrote, the control voltage might just be DC and not AC and you have your meter set to measure AC voltage. That could account for the meter momentarily "jumping" to 24 volts when the coil is energized OR deenergized with DC voltage. Try setting your meter for DC measurements, try again, and report back. Jeff They are normal on-off type. I tried for DC with same result. I believe now that my meter does not measure correctly.- Hide quoted text - - Show quoted text - Back to the problem. Is the load working? If you are measuring 0 volts across the 240V contacts it indicates that the switch has closed and the load should be getting current. 240v measurement means the switch is open and load is off. |
#12
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Relay problem
240 V lights? Explain
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#13
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Relay problem
On Nov 18, 4:53 pm, wrote:
240 V lights? Explain I think he may be in Finland, and in Europe the normal light and receptacle voltage is 240 volts ac 50hz. [8~{} Uncle Monster |
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