Question about Baldor 115v,1ph, 3,600rpm 7" 1/2hpbnch Grindr W/Exh

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What is the use of the relay in the motor grinder.is thecoil of the relay in series with the running winding or in the starting winding

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Is for safetyreasons. when it is running when you pull the plug out, without a relais it starts running when you putt plug in. so the on switch triggers the relais and the off switch brakes the takeovercontact. very oft the relais are of bad quality . for private use it is not ness.

Posted on Feb 09, 2010

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1 Answer

Motor hums will not start


A single phase motor needs an additional winding for starting. The winding is often isolated by a centrifugal switch. If the grinder is little used it would not be unusual to find the bob-weights and linkage to be seized.
It would seem time to dismantle the grinder and carry out some maintenance.

Dec 24, 2015 | Grinders

1 Answer

Motor just hums,grinder wedges are free, no leaks apparent,motor turns free in both directions.


yes there is start capacitor on each motor, connected to start winding.
There are two windings on each motor: start winding and run winding.
Both windings receive power at same time. If the start winding is bad, or capacitor is bad, then motor hums as the run winding receives power but there is not enough torque to get the motor rotating.
If motor is humming instead of rotating, then quickly the motor overheats and looses speed after repair or melts and fails.
The problem with disposal repair is getting the thing apart... finding replacement capacitor, or replacement parts, and then reassembling without a leak.
http://waterheatertimer.org/How-to-repair-and-install-Garbage-disposal.html
http://waterheatertimer.org/Color-codewire.html#motor
http://waterheatertimer.org/Color-codewire.html#Motor

Gene
h

Nov 15, 2013 | In-Sink-Erator Garbage Disposals

1 Answer

Where are the brushes located on a Baldor 7306D grinder


there are no brushes for this type of motor, it has centrifugal switches and starter windings/run windings.

Apr 02, 2011 | Baldor 7306d 7" Deluxe Grinder, 1,800 Rpm

1 Answer

I have a ludell (machine tool) bench grinder. The problem is that the grinder disc will not turn. The motor hums but won't turn. I took the disc off and turned the shaft by hand with the powder on and it...


Ah, the start winding is not operating. When you turn the motor by hand. When the motor speeds up, do you hear a click sound? This is the start winding switch working. There might be a capacitor that is wired in with this switch that is used to start the grinder. If this capacitor is fried, the motor will not start. If the switch is shot, also the motor will not start. There could also be a wire or connector in this part of the motor that is not connected, or fried and not making contact. These are a few things to look for.

Jan 30, 2011 | Grinders

1 Answer

My 6 inch Cummins bench grinder stopped working. When you turn on the switch it only has a quiet hum. Is it the capacitor?


Try wrapping a thin cord around the shaft many times to allow the shaft to be spun in the normal running direction when pulled. Pull sharply on the cord and turn the motor on--if the starting capacitor is bad, the motor should continue to run until shut off. If there is no capacitor, then the motor uses a start winding and a centrifugal switch to start. The switch is supposed to open when the motor comes up to speed. If you used to hear a loud 'click' when the motor was shut off and slowing down, then you likely have the start winding and switch. If the contacts on the switch become burned and not make contact, then it will display the symptoms you mention. You will need to access one or the other end covers to reach the switch. Hope this helps!

Jan 04, 2011 | Delta 23 684 6 Inch Bench Grinder Wheel,...

1 Answer

It hums but won't turn. are there brushes? what is the black canister hooked to wiring going to motor? aloha, chip


Hi Chip , have you tried !!carefully!! turning the grinding wheels whilst the grinder is powered up and humming and does this start the machine , if it does your motor start capacitor ( a cylinder/tube with 2 wires or connectors on it ) will be deffective or the leads might have became detached from it , a replacement capacitor is quite cheap but you must replace it with the exact one ( a motor start/run capacitor of the correct Mfd or uF rating typically 30 uF/Mfd and at the correct voltage 110/220V )
if this dosent fix your problem most likely your motor start windings in the motor field coils are burnt out and the grinder is uneconomical to repair .
hope this helps .

Jan 22, 2010 | Delta Shopmaster 8" Bench Grinder

1 Answer

I have a Delta Rockwell Radial Arm saw model L-40C (equivalent to model 33-527) that is running backwards. How do I reverse the motor rotation?


Sorry I don't know the saw in question, but I would assume either the starter winding connections or the run winding connections have been reversed. Was the motor replaced or was the starting capacitor serviced recently?

Thanks!

Jan 20, 2010 | Delta Saws

2 Answers

Older sears bench grinder wont run 1/3 hp model 397 19581


I know this is an old post, but maybe it will help others looking for information.

I have the Craftsman 1/3-HP grinder models: 397.19580 & 397.19581.

They are Split-Phase single voltage (115 V), and use a Klixon start-up current style relay - 2CR14-224.

The relay is normally open. When the large starting current in the main/run winding circuit is sensed by the the relay coil (term 3 & 4) which is in series with the main winding, the relay contacts close (term 2 & 4).

The one end of the start-up winding is connected to the main coil's BLK wire in the coil pack.

When the relay contacts close the start-up winding is energized. The start-up coil is used to provide a boost to over-come the resting inertia of the rotor.

Once the rotor reaches between 65% - 75% of operating speed, the current through the main winding circuit is reduced to the point that the relay coil cannot over come the return-springs force, acting on the relay contact arm. With the contacts open, the start-up winding is no longer energized.

This should take about 2-3 seconds, if the relay malfunctions, the high current through the start-up windings (thin wires) may be damaged.

Here is a diagram I have made.
older-sears-bench-grinder-wont-run-1-3-z1zi3msqm0xxzvze3v341n5r-4-0.jpg

Klixon 2CR relays are no longer available.

You may find a suitable replacement here:
http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_

May 31, 2009 | Craftsman 6" Bench Grinder with Lamp

1 Answer

Older sears bench grinder wont run 1/3 hp model 397 19581


Hi again, OK, Well since I don't have a wiring diagram and the colors don't help. I am also going to assume it is 110VAC. The larger wires are probably the run or primary, it you remember which ones were connected it will help with polarizing. ( getting it to run in the right direction as well as the start and primary working together). You can use the two terminal switch but you should use a three wire cord. Use the switch to break the neutral and ground the case. The connections should be as follows: Connection 1, would have one of the primaries and one of the starts to neutral. Connection 2, the other start to the relay. Connection 3, the coil side of the relay to the remaining primary. ( if the relay has two connections on one end and one on the other it would be the single) Connection 4, the 3rd position on the relay to hot. That is how a split phase is wired. You may find a simple wiring diagram on the net if you type split phase motor wiring diagram. Good Luck to you, this should Fixya!

Mar 04, 2009 | Grinders

1 Answer

La Pavoni Coffee Grinder PA Burr


usualy reserable termic fuses are attached to body of motor, or inside the winding wires of motor.
  1. if it is attached to motor body than you should reset yourself, usualy they are black, round colour with red reset button on center. it is enough to push that red button and you reset it.
  2. if it is in winding wires it should reset when motor temperature drops, if that is not the case than you should consult winding expert for that, in your region.

Oct 15, 2008 | La Pavoni PA-BURR Electric Burr Grinder

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