3.12 External Interlock
Systems that may be affected during drive fault conditions should be interlocked with the drive fault output and ready signal.
u
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.
The “Drive ready” signal switches off when operation is not possible for a Run command input under the following conditions
regardless of whether 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 will not accept a Run command even when entered
n
Interlock Circuit Example
Two drives running a single application might interlock with the controller using the Drive Ready and Fault output signals as
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.
Terminal
Output Signal
Parameter Setting
MA, MB, MC
Fault
–
M1-M2
Drive Ready
H2-01 = 06
Operation
Circuit
Drive Ready
Drive 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
Drive 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 Ready
Drive 2
Figure 3.39 Interlock Circuit Example
3.12 External Interlock
104
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
