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-- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. |
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070704 2133 - Warren Weber posted:
Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. The motor should start and run in only one direction. My first thoughts are that the starting relay in the motor is either stuck, or the contacts are dirty. You will probably have to take the end bell off the motor and check out this relay. It works on a centrifugal principal: as the motor speeds up, the relay opens and removes the capacitor and start windings from the circuit. |
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indago writes:
070704 2133 - Warren Weber posted: Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. The motor should start and run in only one direction. My first thoughts are that the starting relay in the motor is either stuck, or the contacts are dirty. You will probably have to take the end bell off the motor and check out this relay. It works on a centrifugal principal: as the motor speeds up, the relay opens and removes the capacitor and start windings from the circuit. Slight correction. A capacitor start motor may run in either direction but the winding used for starting should only start it in one direction with a given wiring arrangement. This is determined by the placement of the capacitor and the physical construction of the motor. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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"Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Is there a centrifugal switch in series with the start circuit? If yes, then it is the relative phase of the two windings that determines the direction of rotation. To reverse this type of motor, swap ends on either winding (but not both). This is also true of split phase motors (no start capacitor but still have the centrifugal switch). I have seen motors of this type with open start circuits that will start in either direction with the slightest nudge ... of course, they have very low starting torque. |
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"Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks |
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"Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? |
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"Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? http://www.lmphotonics.com/single_phase_m.htm Capacitor start/run Hope this helps you but it doesn't seem to answer your problem. However, having properly identified the type of motor, you can Google for more info. Or, post again with the motor properly identified. |
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"Warren Weber" writes:
"Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? See if there is any torque during starting. I bet there is none and little load, so it starts either direction at random. The circuit to the starting winding is not being energized or the start capacitor is open (but you said you checked this?). --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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"Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? If there's no start switch, it's a permanent split capacitor, or PSC motor. Never seen one that would run in either direction without changing the wiring though. Normally you swap the phase of one winding to reverse. |
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I had a machine with a reversable capacitor start 1 HP motor. I found
that if you switched the direction without stopping the motor, the inertia of the machine would cause it to keep on running in the original direction despite the winding mismatch. James Sweet wrote: "Warren Weber" wrote in message ... "Warren Weber" wrote in message m... "Warren Weber" wrote in message om... -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? If there's no start switch, it's a permanent split capacitor, or PSC motor. Never seen one that would run in either direction without changing the wiring though. Normally you swap the phase of one winding to reverse. I had a machine with a reversable capacitor start 1 HP motor. I found that if you switched the direction without stopping the motor, the inertia of the machine would cause it to keep on running in the original direction despite the winding mismatch. -- Joe Leikhim K4SAT (this posting in DSB to placate the KOOKS) "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P |
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"James Sweet" writes:
"Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. "Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? If there's no start switch, it's a permanent split capacitor, or PSC motor. Never seen one that would run in either direction without changing the wiring though. Normally you swap the phase of one winding to reverse. Right, has to be an open start winding or something along those lines. The direction is determined by the physical winding placement. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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**THE-RFI-EMI-GUY** writes:
I had a machine with a reversable capacitor start 1 HP motor. I found that if you switched the direction without stopping the motor, the inertia of the machine would cause it to keep on running in the original direction despite the winding mismatch. James Sweet wrote: "Warren Weber" wrote in message ... "Warren Weber" wrote in message m... "Warren Weber" wrote in message om... -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? If there's no start switch, it's a permanent split capacitor, or PSC motor. Never seen one that would run in either direction without changing the wiring though. Normally you swap the phase of one winding to reverse. I had a machine with a reversable capacitor start 1 HP motor. I found that if you switched the direction without stopping the motor, the inertia of the machine would cause it to keep on running in the original direction despite the winding mismatch. Yes, because that probably has a centrifugal starting switch which disconnects the starting winding entirely when at normal speed. So, the direction changing switch has no effect until it goes down to below about 75 percent of normal speed. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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"Warren Weber" wrote in message . .. -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for all of the replies. Just a cap start motor. 1 cap 2 windings. As shown on #5 that charles sent. Did ohm out per diagram. May be a shorted start winding. This is a band saw motor (Delta) Price on motor almost same as price of saw. (9 inch saw). Owner will replace saw. TIA. WW |
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Makes sense
Sam Goldwasser wrote: **THE-RFI-EMI-GUY** writes: I had a machine with a reversable capacitor start 1 HP motor. I found that if you switched the direction without stopping the motor, the inertia of the machine would cause it to keep on running in the original direction despite the winding mismatch. James Sweet wrote: "Warren Weber" wrote in message om... "Warren Weber" wrote in message news:4ZmdnZHW7s3JOBDbnZ2dnUVZ_oqmnZ2d@bresnan. com... "Warren Weber" wrote in message news:zbidnTPS78EYxRHbnZ2dnUVZ_oupnZ2d@bresnan .com... -- Capacitor start motor. Starts and runs in either direction as it pleases. Capacitor good (replaced with others as test) 2 windings. Run winding across line voltage, Start winding across line voltage with capacitor in series. What determines rotating direction when starting?? This is on a small Delta 9 inch bandsaw. Both windings ohm out OK. Thanks for answers. Had removed one end bell and wire terminations are enclosed in epoxy. No starting switch on this end. Will check other end bell. Motor at friends house Will recheck. Thanks NO start switch. ??? If there's no start switch, it's a permanent split capacitor, or PSC motor. Never seen one that would run in either direction without changing the wiring though. Normally you swap the phase of one winding to reverse. I had a machine with a reversable capacitor start 1 HP motor. I found that if you switched the direction without stopping the motor, the inertia of the machine would cause it to keep on running in the original direction despite the winding mismatch. Yes, because that probably has a centrifugal starting switch which disconnects the starting winding entirely when at normal speed. So, the direction changing switch has no effect until it goes down to below about 75 percent of normal speed. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. Makes sense -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P |
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