Dilemma about the rotation of GEC dc motor 1

[panter]

Hello everyone,
I have working on reparation of all main poles 260kW DC motor *frame size QMS 500/800* and I have a great unknown about the direction of rotation of this electric motors . We finally got a part of the original certificates of the motor, but for rotation at non drive end instead of the standard term clockwise or anti clockwise it writes Jog Reverse.
As English is not my native language I need a little help what jog reverse means.
Thanks in advance !

 

[motorspert]

Hi
jog reverse means rotating in small increments in the revers direction ie iF you had a crane motor jog reverse would be used to move the crane in small steps (jog) when close to the object.

I am afraid this doesn't tell us what the direction of rotation is unfortunately.

 

[waross]

Reverse is the opposite to the normal rotation.
Jog; The motor only runs while the jog button is depressed. May be JOG(forward) or JOG REVERSE.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[panter]

Thanks for yours replay .
Waross,
disposition of the main and auxiliary poles indicates that the direction with the + polarity on the F1 and A1 connection should be oposite to the normal direction * normal is anti clockwise * looking at the side of the collector .
Am I right ...
Information from motor owner and some papers from other overhaul Workshops intake a little confusion for me .

 

[waross]

Energize the motor with a 12 Volt automotive battery and see which way it turns. Use a compass or a small magnet to check the polarity of the inter-poles.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[waross]

It's been many years since I worked on DC motor repair. Energize the field with full voltage and energize the armature circuit with the battery. I have been able to turn large motors with only 2 or 3 volts on the armature circuit. This avoids issues with wrong markings or missing markings on the leads.

Bill
--------------------
"Why not the best?"
Jimmy Carter