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In order to ensure safety of the user system employing the C-875, the users are advised to develop suitable
safety measures considering vulnerability of the given system and reliability of the following possible
actions.
The C-875 or the system employing the C-875
due so a reason or another
may fail to stop pulse output
(so called run-away).
The following table rates reliability of each possible measure in preventing the pulse output in such case.
1
Cutting off the drive
The most safe and sure approach.
system power supply
2
Entry of the RESET signal.
Entering the RESET to the C-875 alone can save your system.
This operation initializes the C-875.
The function for stopping the pulse output can also be adversely
affected by failure on a circuit connected to the system.
3
Entry of the FSSTOP signal.
Entering the FSSTOP saves data stored on the MCC05v2.
The function for stopping the pulse output can also be adversely
affected by failure on a circuit connected to the system.
4
Entry of the LIMIT signal
This input signal also stops the pulse output.
Its reliability, however, is lower than the above two measures.
Considering circuit configurations of the C-875 and MCC05v2, reliability of each input signal can
be rated as shown below:
RESET＞FSSTOP＞LIMIT
When the above trouble on the system can involve personal injuries, the drive system power must be turned off
(the measure "1" in the table) immediately.
Measures 3 and 4 should be employed only when protection of the user system is the key issue.
In this case, too, you should consider replacing them with measures 2 or 1 if magnitude of actual damages
greater than anticipated.
Summary of Contents for C-875
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