Fault finding

The CMM will not register a probe trigger, but the probe operates normally when the stylus is deflected by hand:

PI 200-3 indicators

Possible causes

Remedy

'STOP' lamp ON.


'TP200' lamp ON.


'SEATED' LED operates normally.

The CMM controller or a Renishaw system has activated STOP signal.


SCR200 overtravel mechanism is deflected.

Check status of Renishaw motorised probe head or other systems.

 

Clear obstruction and allow overtravel mechanism to reset.

 

The probe fails to trigger and the probe LEDs glow only dimly when the stylus touches the workpiece, but the probe operates normally when the stylus is deflected by hand:

PI 200-3 indicators

Possible causes

Remedy

'SEATED' LED ON.

The trigger speed is too slow.

 

The stylus is too heavy.

Probe normally to the workpiece surface.

 

Increase gauging speed.

  

The probe will not arm or the probe does not stay armed when the RESET button is released. The probe LEDs are always OFF:

PI 200-3 indicators

Possible causes

Remedy

'STD' LED ON.

 

'SEATED' LED OFF.

Probe sensor faulty.

 

Probe wiring open circuit.

Remove probe and test by substitution.

 

Check wiring from probe to PI 200-3 interface.

 

The probe will not arm or the probe does not stay armed when the RESET button is released. The probe LEDs are always ON:

PI 200-3 indicators

 Possible causes

Remedy

'TP200' LED ON.

 

'SEATED' LED OFF.

 Probe sensor faulty or damaged by collision.

Remove probe and test by substitution.

False (‘air') triggers occur while the CMM is stationary and the probe LEDs flicker:

 PI 200-3 indicators

Possible causes

Remedy

 'TP200' LED ON.


 'SEATED' LED operates normally.

Probe sensor faulty.

 

Probe loose in probe head.

 

Excessive vibration from external source.

 

Excessive vibration from CMM.

Remove probe and test by substitution.

 

Correctly tighten probe.

 

Remove cause or isolate CMM.

 

Check CMM air supply.

 

Maintain CMM air bearing system.

  

False (‘air') triggers occur at gauging speed and the probe LEDs flicker:

PI 200-3 indicators

Possible causes

Remedy

'DAMPED' LED is OFF.


'SEATED' LED operates normally.

Stylus is too large or heavy.


Excessive vibration from CMM.

Use stylus arrangements within recommendations.


Check CMM air supply.


Maintain CMM air bearing system.

  

False (‘air') triggers occur at traverse speed and the probe LEDs flicker:

PI 200-3 indicators

Possible causes

Remedy

'DAMPED' LED is ON.


'SEATED' LED operates normally.

Stylus is too large or heavy.

 

Excessive vibration from CMM.

 

Traverse speed is too high.

Use stylus arrangements within recommendations.

 

Check CMM air supply.

 

Maintain CMM air bearing system.

 

Reduce traverse speed.

 

 The probe triggers during an SCR200 stylus change:

 PI 200-3 indicators

Possible causes

Remedy

'SEATED' LED operates normally.

The SCR200 is not connected to the PI 200-3.

 

Incorrect SCR200 operating mode.

Check SCR200 indicator lamps.

 

Re-connect cable.

There is an unexpected loss of accuracy:

PI 200-3 indicators

Possible causes

Remedy

'TP200' LED ON.

 

'SEATED' LED operates normally.

Stylus ball is damaged or dirty.

 

Stylus is too large or heavy.

 

The probe is loose or not correctly assembled.

 

The kinematic coupling is damaged or dirty.

 

The gauging speed has been changed.

The trigger threshold has been changed.

Inspect and clean stylus ball, or replace and re-qualify the stylus.

 

Use stylus arrangements within recommendations.

 

Check the stylus joints. Ensure the module is correctly seated and the probe is tight in the probe head.

 

Inspect and clean the kinematic coupling.

 

Re-qualify stylus tips.

 

Deflection alarm active:

PI 200-3 indicators

Possible causes

Remedy

Audible indicator ON.

The stylus is or was deflected for >10s.

 

Stylus module was changed manually.

Move the stylus clear of any obstruction and press the RESET button