Omron DST1 Series, Operation Manual

Page: 85 / 114

6-4 Maintenance
Message Countermeasure
Total On Time or Contact Operation
Counter Exceeded Threshold -
Operation Time Exceeded Threshold -
Unit Conduction Time Exceeded
Threshold -
Network PS Voltage Fell Below
Threshold -
Output PS Voltage Low
Input PS Voltage Low Check the following items.
- Are cables broken?
- Is the power voltage within specifications?
6-4 Maintenance
This section describes the routine c leaning and inspection recommended as regular
maintenance. Handling methods when replacing the DST1-series Safety I/O Terminals
are also explained here.
6-4-1 Cleaning
Clean the DST1-series Safety I/O Terminals regularly as described below to keep the
network in optimal operating condition.
•
Wipe the DST1-series Safety I/O Terminals with a dry, soft cloth for regular cleaning.
•
When dust or dirt cannot be removed with a dry cloth, dampen the cloth with a
neutral cleanser (2%), wring out the cloth, and wipe the DST1-series Safety I/O
Terminals.
•
Smudges may remain on the DST1-series Safety I/O Terminals from gum, vinyl, or
tape that was left on for a long time. Remove these smudges when cleaning.
Note: Never use volatile solvents, such as paint thinner or benzene, or chemical wipes to clean
the DST1-series Safety I/O Terminals. These substances may damage the surface of the
DST1-series Safety I/O Terminals.
6-4-2 Inspection
Inspect the system periodically to keep it in optimal operating condition.
In general, inspect the system once every 6 to 12 months, but inspect more frequently if
the system is used in high-temperature, humid, or dusty conditions.
Inspection Equipment
Prepare the following equipment before inspecting the system.
Equipment Required for Regular Inspection
Phillips screwdriver
A flat-blade screwdriver
A screwdriver for connecting communications connectors
A tester (or a digital voltmeter)
Industrial alcohol and a clean cloth
Other Equipment That May Be Required
A synchroscope
An oscilloscope
A thermometer or hygrometer
6-7