HLVH slow speed wont work, high speed does

valleycycles · Aug 30, 2018

Hello all knowing Hardinge folks.
My HLVH, having the traditional 2 speed motor no longer will start up in low speed. It looks like its trying buy cant seem to get going. Starting up in high speed is fine. Then I switch over to low speed and it runs fine in low.
Seems like an issue somewhere with a start up capacitor???? Too much static load and not enough amps to overcome the spike???
How can I fix this?
Thanks for any suggestions

Billtodd · Aug 30, 2018

no start caps ina three phase motor :-)

sounds to me like you've lost a phase on the low speed wiring somewhere. Check first for loose wires around the main switch , contactors and OL relays. From memory the hlvh has overload protection on both speeds so check continuity across the 'heaters' If the wiring in the main box is ok , check wiring in the motor connection box . The motors hardinge used were some of the best available so is probably the least likely to fail.

Bill

Mark Rand · Aug 30, 2018

Probably open circuit on one phase in high speed.

Check all of the motor to switch wiring and all of the slow/fast switches with a meter and eyeball. Obviously with the power disconnected...

FredC · Aug 30, 2018

Check the contacts on the low speed relay. I had to replace the contact on mine, had a contactor in the tool box and it happened to interchange (single contact).

rons · Aug 30, 2018

valleycycles said:
My HLVH, having the traditional 2 speed motor no longer will start up in low speed. It looks like its trying buy cant seem to get going. Starting up in high speed is fine. Then I switch over to low speed and it runs fine in low.

The high/low control arm rotates a black plastic piece inside the control cabinet. The piece has cams along the length that push on switches. The switches will connect the high/low speed wiring to the motor. When I have a issue like yours it always turns out to be this black plastic piece and those switches.

FredC · Aug 31, 2018

rons said:
The high/low control arm rotates a black plastic piece inside the control cabinet. The piece has cams along the length that push on switches. The switches will connect the high/low speed wiring to the motor. When I have a issue like yours it always turns out to be this black plastic piece and those switches.

You may be correct I did not go look at mine again so maybe there is not a low speed contactor. I just threw the forward and reverse switch back and forth and could hear the contactor cycling. That was probably the one I swapped out the contact. If one of those goes out it might affect high and low speeds.

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