Laser beta lasermike LS8000-3 - Manual (Page 216)

LaserSpeed 8000-3 Instruction Handbook
Appendix E: Troubleshooting Guide
Part No. 93463 / Drawing No. 0921-01561 Page 216 of 221 Revision A (Sep 2007)
Material Present sensitivity
not adjusted correctly
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.
Counter isn't counting, but
everything looks fine in LaserTrak Wiring
Configuration 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.
Length is still counting even
though material is not in front of
gauge, and QF is zero.
--- or ---
Counter continues to count after
material exits measurement area.
Velocity Hold 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.
Pulses are only 4-4.5V, even
though I've connected 24V to User
Input Voltage (pin 20). Signal Ground not
connected.
Connected to the wrong
pulse output The pulse output ground is isolated from
the power ground. Make sure the +24V
supply for the pulse outputs is
connected to both User V
IN
(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.