9. MAINTENANCE and INSPECTIONS
The inspection should be conducted once every 6 months to a year.
Any inspected items which do not satisfy the criteria shown below should be repaired.
9-1. Inspection
Inspection
item
Inspection Description Criteria Remark
Power
supply
Measure the voltage fluctuation at the power supply
terminal block to determine if it is within the
prescribed range.
Power supply voltage
fluctuation must be within
21.6V to 26.4VDC range
Tes te r
Check the ambient temperature.
Sensor: -20 to +60°C
Converter: 0 to +55°C
Thermometer
Ambient
Conditions
There should be no accumulation of dust. None
Verify that the sensor is securely mounted.
There should be no
looseness.
Verify that the sensor shaft is securely coupled to the
machine shaft.
There should be no
looseness.
Check for severed cables.
Cable should appear
normal.
Visual
Inspection
Verify that the sensor cable connector is plugged in
all the way.
There should be no
looseness.
Mount
Conditions
Verify that the I/O connector is plugged in all the way.
There should be no
looseness.
9-2. Troubleshooting
The causes and corrective actions for errors that may occur during NCV-20 operation are described below.
Error item Cause Countermeasure
Sensor connector is disconnected.
Sensor connector is loose.
Secure the connector
Sensor
disconnected LED
(SE) is ON.
Sensor cable is severed. Replace the sensor cable
Coupling of sensor shaft and machine shaft is loose. Deviation in origin
point position.
Sensor mounting is loose.
Secure the coupling or mounting.
Latch pulse output signal and position data reading
timing is improper.
HOLD input signal and position data reading timing is
improper.
Correct the reading timing.
Incorrect position
data output
The wiring of the output signal has problems. Repair the wiring.
The function setting switch is incorrect. Change the setting.
The voltage of the power supply for input and output is
out of prescribed range.
Supply the correct power voltage.
21.6V to 26.4VDC
Position data
HOLD doesn’t
occur.
The wiring of the input signal has problems. Repair the wiring.
The function setting switch is incorrect. Change the setting.
The voltage of the power supply for input and output is
out of prescribed range.
Supply the correct power voltage.
21.6V to 26.4VDC
“HD”(the external input signal) is ON.
Check the signal.
No position data
output
The wiring of the output signal has problems. Repair the wiring.
If the troubleshooting procedures described above fail to solve the problem, the sensor or converter may be
defective. In this case, please contact your NSD representative.
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