10 - 3
10 Maintenance and Inspection
NX-series Safety Control Unit User’s Manual (Z930)
10-1 Cleaning and Maintenance
10
10-1-2 Periodic Inspections
Required Tools
• Flat-blade screwdriver
• Phillips screwdriver
• Voltage tester or digital voltmeter
• Industrial alcohol and clean cotton cloth
Tools Required Occasionally
• Oscilloscope
• Thermometer and hygrometer
3 Ambient envi-
ronment
Check that the ambient operating
temperature is within the criteria.
0 to 55°C Use a thermometer to check the tem-
perature and ensure that the ambient
temperature remains within the
allowed range of 0 to 55°C.
Check that the ambient operating
humidity is within the criteria.
10% to 95%
With no condensation.
Use a hygrometer to check the
humidity and ensure that the ambient
humidity remains between 10% and
95%.
Check that condensation does not
occur due to rapid changes in tem-
perature.
Check that the Units are not in
direct sunlight.
Not in direct sunlight Protect the Units if necessary.
Check for accumulation of dirt,
dust, salt, or metal powder.
No accumulation Clean and protect the Units if neces-
sary.
Check for water, oil, or chemical
sprays hitting the Units.
No spray Clean and protect the Units if neces-
sary.
Check for corrosive or flammable
gases in the area.
No corrosive or flam-
mable gases
Check by smell or use a gas sensor.
Check that the Units are not subject
to direct vibration or shock.
Vibration resistance
and shock resistance
must be within specifi-
cations.
Install cushioning or shock absorbing
equipment if necessary.
Check for noise sources nearby the
Units.
No significant noise
sources
Either separate the Units and noise
source or protect the Units.
4 Installation and
wiring
Check that the DIN Track mounting
hooks on all Units are securely
locked.
No looseness Securely lock all DIN Track mounting
hooks.
Check that cable connectors are
fully inserted and locked.
No looseness Correct any improperly installed con-
nectors.
Check that the screws on the End
Plates (PFP-M) are tight.
No looseness Tighten loose screws with a Phillips
screwdriver.
Check that each Unit is connected
along the hookup guides, and fully
inserted until it contacts the DIN
Track.
The Units must be con-
nected and securely in
place on the DIN
Track.
Connect each NX Unit along the
hookup guides, and insert each NX
Unit until it contacts the DIN Track.
Check for damaged external wiring
cables.
No visible damage Check visually and replace cables if
necessary.
5 Safety valida-
tion testing (user
testing)
Check to be sure that all safety
functions operate correctly.
All functions must
operate as intended.
Remove the cause of errors and
check the operation of all safety
functions again.
Tools Required for Inspections
No. Item Inspection Criteria Corrective action