Kaman KDM-8200 - Manual (Page 42)

42
Kaman Precision Products
Appendix C: Troubleshooting
Symptions
The following information is a Symptom/Solution cross reference. If after reviewing the
and Causes previous checklist of common problems you don’t remedy the problem you are having,
find the symptom you are experiencing below and refer to the list of possible causes.
Symptoms are marked with letters; causes/solutions are marked with numbers. For
example, if you are experiencing the symptoms described in C, refer to solution 3.
SYMPTOMS
A. A saturated output of ± 9 to 11 volts (with 12V internal regulator) or ± 7 to 8 volts
(with 8V internal regulator), with no change in target position and with target in range.
See 2 (open only) and 3,5,6.
B. Unchanging output voltage, anywhere from +1 to -2, with change in target position.
See 2 (short only) and 3, 5, 6.
C. Output drifts with no change in target position. See 3.
D. Random changes in output with no change in target position. See 1, 3, 4, 5, 7 (for
multiple channel system) and 8.
E. Nonrepeatability. See 3, 4, 6, 7, 8.
F. Unable to calibrate, or while calibrating you “run out” of calibration controls. See 1,
2, 3, 5, 6, 8.
G. System does not meet linearity specifications within a .5% deviation. See 3.
1. CAUSE:
Intermittent cable.
This problem is typified by large output changes (full volts vs. millivolts) when the cable
is moved.
SOLUTION:
1. Visually inspect the cable,
2. Test it with an ohm meter and confirm the variable/short problem while
moving the cable,
3. Replace the cable.
3. CAUSE:
Open sensor coil, shorted or open cable.
A short will yield very low to zero voltage while an open will yield saturation voltage.
SOLUTION:
1. Visually inspect,
2. Test it with an ohm meter: zero to near zero for a short; infinite to full scale
for a deflection or open. A good sensor will test 1 to 5 ohms on the average;
a sensor/cable combination will be higher.
3. Replace the sensor and/or cable.