Laser LS8000-3 manual LaserSpeed 8000-3 Instruction Handbook

LaserSpeed 8000-3 Instruction Handbook

Appendix E: Troubleshooting Guide

Material Present sensitivity not adjusted correctly

Counter isn't counting, but	Wiring
everything looks fine in LaserTrak

	Configuration
Length is still counting even	Velocity Hold
though material is not in front of
gauge, and QF is zero.
--- or ---
Counter continues to count after
material exits measurement area.
Pulses are only 4-4.5V, even	Signal Ground not
though I've connected 24V to User	connected.
Input Voltage (pin 20).

Connected to the wrong pulse output

The Material Present threshold must be properly adjusted so that the gauge can determine whether or not material is present. Use LaserTrak to adjust the Material Present Threshold. This threshold is a number between 0 and 1023. Raising the threshold will make the gauge less sensitive, and will require more reflected light to turn on Material Present. Lowering the threshold will make the gauge more sensitive and will require less light to turn on Material Present. Adjusting the value to too low a number may result in false Material Present readings.

1.Verify that voltage and ground are both connected between the counter and the LaserSpeed.

2.If using a counter with single-ended inputs, verify that Phase A False and Phase B False are not connected to ground.

Check scaling on pulse output and in counter, make sure that maximum frequency of the counter is not exceeded.

When the velocity is above the "Hold Velocity if Above" setting, and the gauge loses measurements, it will continue to output pulses and count length.

To disable this feature, use LaserTrak to set the Hold Velocity if Above setting to a large value like 50,000.000.

The pulse output ground is isolated from the power ground. Make sure the +24V supply for the pulse outputs is connected to both User VIN (Pin 20) and Signal Ground (pin 21.)

The LS8000-3 has two pulse outputs, one that is voltage scaleable, and one that is not. Make sure you are connected to the User Scaleable Pulse Output, not the High Speed Pulse Output. The High Speed output is always 5V, as it uses RS-422 drivers.

Part No. 93463 / Drawing No. 0921-01561 Page 216 of 221 Revision A (Sep 2007)