Yaskawa MP930 - Manual (Page 67)

Basic System Operation
3.3.1 Power Failure Detection
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3.3 Power Failures
This section explains the processing when an MP930 power failure occurs.
3.3.1 Power Failure Detection
Table 3.3 shows the start methods used when an MP930 power failure occurs.
The MP930 can select two types of startup: Continuous operation and new operation. The
selection of continuous operation or new operation is made on the CP-717 System Definition
Screen.
For details on the CP-717 operation method, refer to the MP9jj Machine Controller Pro-
gramming Software User’s Manuals (SIEZ-C887-2.2-1, SIEZ-C887-2.2-2).
Table 3.3 MP930 Start Modes
Length of Power
Failure
Continuous Operation/
New Operation
Start Method
0 to 20 ms − Operations continue.
20 ms to Ns*
(Power loss) When continuous operation is
selected After the CPU is reset, no self-diagnosis is
performed, and operations continue.
When new operation is
selected After the CPU is reset, self-diagnosis is
performed, and the new operation starts.
Ns* or more When continuous operation is
selected After the CPU is reset, no self-diagnosis is
performed, and operations continue.
When new operation is
selected After the CPU is reset, self-diagnosis is
performed, and the new operation starts.
* Ns (power loss decision time) is defined on the CP-717 System Definition Screen.
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