Not Switching to Delta

Good luck. Let us know how it comes out.

Have you tried it with the motor connected?

How do you re-energize the circuit?

I think you should hire an electrician, soon.

Probably quicker to rewire it.

That's why he should hire an electrician.

Rewire your starter circuit as per below diagram.

What is the advantage of connecting indicating lamps to 24V instead of 220V?.

"What is the advantage of connecting indicating lamps to 24V instead of 220V?." How is this related to this thread?

"What is the advantage of connecting indicating lamps to 24V instead of 220V?"

Connecting indicating lamps to low voltage allows you to make "on-line" replacements of broken or burned-out bulbs without danger of touching a 220V conductor.

Some Y-Δ timings can result in a very large current upon switching to Δ. In turn, this could cause enough voltage dip to drop out the Δ contactor.

Iv already faced with this problem.while motor is not connected and your circuit start with Star stage and after that timer command to connect Delta stage ,it shows holding contact DELTA contactor doesnt match correctly and cause circuit goes off.

Have you checked your timer? It is posible that timer may not be holding delta contact continuously.

What make & type number starter is it? You may be able to download the schematic circuit diagram. Have you tried?

Hi pickid,

You wrote that after the delta contactor catches for a second "everything goes off." Assuming your starter uses three contactors (line, star, delta) and that you operate it using a momentary stop/start pushbutton set, then the problem seems to be in the holding circuit.

Try this --- when you push the start pushbutton, don't release it right away. Hold it in firmly until the delta contactor catches. If the delta contactor remains energized then check out the following possibilities:

• Voltage drop in the control circuit caused by loose wiring connections, control transformer undersized or defective, delta contactor sticks drawing excessive current, etc.
• The mechanical jolt of the delta contactor pulling in causes the auxiliary NO holding contact of the line contactor to drop out momentarily.

Hope this helps!

Zvi

Very Carefully.... Pull the Disconnect and LOCK IT OUT!

Then Lock out the Control Power if external

Check every Auxiliary Contact that you can find, check the timers, check the relays if you have them. While you're at it, Check the Starters..

If you find the problem and it runs ok after:

Schedule it for a proper Panel Rewire/Upgrade/Cleanup with proper schematics during downtime....