Okuma OSP 5000, Electrical Maintenance, Training Manual

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7-2
Okuma America Corporation
Lathe Lathe
Lathe Lathe
Lathe
Rev. 8-21-01
Common variable
Common variables are programming variables that can be used from one program to
another. They can be used in sub and main programs.
System Parameter
The system parameters are different for every machine. They define the characteristics of
the individual axes.
STROKE END LIMIT
The stroke end limits (SEL’s) define the limits of the axis travel. With SEL’s the
ballscrews are protected from overrun. SEL’s are also referred to as the machines soft
limits. The machines are also protected with stroke end limit switches (hard limits). If
any of these limit switches are actuated, the power to the machine, with exception of the
control, is shut off and machine operation is brought to a complete stop.
SETTING STROKE END LIMITS
Any time an Absolute Position Encoder is replaced, a belt is broken, or a motor is removed for
inspection, the Stroke End Limits in the System Parameter menu have to be reset. After the
Absolute Position Encoder has been replaced, power on an do the following to check or reset the
Stroke End Limit parameters:
1. Check the RAPA (in CHECK DATA) signal for the indicated axis and set the +/- Stroke End
Limits a minimum of 20 inches to either side of this value. This will allow you to jog the
axis in either direction.
2. Run (Use the Pulse Handle) the axis in the positive direction until alarm 123 Stroke End
Limit appears. Check the RAPA signal for the present position and subtract .2 inches from
this value.
3. Enter this new value into the “+” Stroke End Limit in the System Parameters. This will
allow you to jog the axis to the outer limit just before tripping the hard limit switch.
4. Turn the STROKE END LIMIT CANCEL switch on and move the axis off of the hard limit
switch by using the Pulse Handle.
5. Turn the STROKE END LIMIT CANCEL switch off and repeat the above steps for the
negative limit. Remember to add .2 inches to the RAPA value to set the - SEL.
When the Stroke End Limits are reset the USER Parameters are assigned the same
dimensions. The operator needs to reset the User Parameters.