82 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
3.12 External Interlock
3.12 External Interlock
Systems that may be affected if the drive faults out should be interlocked with the drive’s fault output and ready signal.
◆ Drive Ready
When the “Drive ready” signal has been set to one of the multi-function contact outputs, that output will close whenever
the drive is ready to accept a Run command or is already running. Under the following conditions the Drive ready signal
will switch off and remain off, even if a Run command is entered:
• when the power supply is shut off.
• during a fault.
• when there is problem with the control power supply.
• when a parameter setting error makes the drive unable to run even if a Run command has been entered.
• when a fault such as overvoltage or undervoltage is triggered as soon as the Run command is entered.
• when the drive is in the Programming mode and will not accept a Run command even when entered.
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Interlock Circuit Example
Two drives running a single application might interlock with the controller using the Drive ready and Fault output signals
as shown below. The figure illustrates how the application would not be able to run if either drive experiences a fault or
is unable to supply a Drive ready signal.
Figure 3. 36
Figure 3.32 Interlock Circuit Example
Terminal Output Signal Parameter Setting
MA, MB, MC Fault –
M1-M2 Drive Ready H2-01 = 06
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