Xycom 9457, Руководство пользователя

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6-1
Chapter 6 – Maintenance
Preventive Maintenance
The 9457 was designed to withstand the harsh environment of the factory floor. Routine
maintenance can help keep your 9457 in good operating condition. Preventive mainte-
nance consists of several basic procedures and checks that will greatly reduce the
chances of system malfunction. Preventive maintenance should be scheduled along with
the regular equipment maintenance to minimize 9457 down time.
Some preventive measures are listed below.
•
Clean or change the fan filters periodically to ensure that the air circulating in the
unit is clean. Filter maintenance should not be put off until the scheduled mainte-
nance, but should be performed periodically, depending on the amount of dust in the
area.
•
Remove dust and dirt from PC components. If dust builds up on heat sinks and cir-
cuitry, the resulting reduction in heat dissipation could cause the unit to malfunction.
If dust reaches the electronic boards, a short circuit could occur.
•
Check the connections to I/O modules, especially in environments where shock
could loosen the connections. Check to see that all plugs, sockets, terminal strips,
and module connections are solid.
•
Do not move noise-generating equipment too near the 9457.
•
Stock spare parts to minimize down time resulting from part failure. The spare parts
stocked should be 10 percent of the number of each unit used. There should be one
spare CPU card each, regardless of the number of CPUs used. Each power supply
should have a back-up. In certain applications where immediate operation of a failed
system is required, an entire spare unit may need to be stocked. See the spare parts
list in Table Chapter 6 -5.
•
When replacing a module, make sure it is the correct type. If the new module solves
the problem, but the failure re-occurs, check for inductive loads that may be gener-
ating voltage and current spikes that may require external suppression.