121
Maintenance Section 7-4
Inspection Procedure
Check the items in the following table and correct any condition that is below
standard.
IMPORTANT • The maintenance interval for the relay contacts must not exceed a period
of 6 month to meet safety category 4 in accordance with EN 954-1.
• The G7SA-2A2B must be used when replacing safety relays.
7-4-3 Replacing the DST1
The network consists of the DeviceNet Unit (master) and DST1 Terminals.
The entire network is affected when a DST1 is faulty, so a faulty DST1 must
be repaired or replaced quickly. We recommend having spare DST1 Termi-
nals available to restore network operation as quickly as possible.
Precautions for Replacing the DST1
Observe the following precautions when replacing a faulty DST1.
After replacement, make sure that there are no errors in the new DST1.
When a DST1 is being returned for repair, attach a detailed description of the
problem and return the DST1 to your OMRON representative.
If there is a faulty contact, try wiping the contact with a clean, lint-free cloth
dampened with alcohol.
Settings after Replacing a DST1
After replacing a DST1, set the new DST1’s switches and configuration data
to the same settings that were used on the old DST1.
Inspection item Details Standard Equipment
Environmental con-
ditions
Are ambient and panel tempera-
tures correct?
Refer to the specifications for
each DST1.
Thermometer
Are ambient and panel humidity
correct?
Refer to the specifications for
each DST1.
Hygrometer
Has dust or dirt accumulated? No dust or dirt Visual inspection
Installation condi-
tions
Is the DST1 installed securely? No looseness Phillips screwdriver
Are the connectors of the commu-
nications cables fully inserted?
No looseness A flat-blade screwdriver
Are the external wiring screws
tight?
No looseness A flat-blade screwdriver
Are the connecting cables undam-
aged?
No external damage Visual inspection
Safety relay opera-
tion
Does the safety relay contact go to
OFF state?
No welded contacts Visual inspection
!WARNING
Safety functions may be impaired and serious injury may occasionally occur.
When replacing a device, configure the replacement device suitably and con-
firm that it operate correctly.
To Next Page
Loading...
Need help?
General
