3.12 External Interlock
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 93
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 if operation is not possible for a Run command input, regardless of whether or not a fault exists:
• 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 wil
l not accept a Run command even when entered.
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 3.34
Figure 3.31 Interlock Circuit Example
Terminal Output Signal Parameter Setting
MA, MB, MC Fault –
M1-M2 Drive Ready H2-01 = 06
Operation
Circuit
Operation Ready
Operation Ready
Stop
Ready1 Ready2 Fault1
Run
Fault2
Run
S1
SC
MB
MA
M2
M1
MC
Fault 1
Ready 1
SA
SA
Max
250 Vac
Relay 1
Relay 2
Relay 1
Relay 2
Controller
Fault
Output
Operation Ready
Operation Ready
Drive 1
Run
S1
SC
MB
MA
M2
M1
MC
Fault 2
Ready 2
SA
SA
Max
250 Vac
Relay 1
Relay 2
Relay 1
Relay 2
Controller
Fault
Output
Drive 2
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