External Device Monitor (Edm ) - YASKAWA UAK series User Manual

8.8.10 External Device Monitor (EDM )

The external device monitor (EDM ) functions to monitor failures in the HWBB function. The relation of the
EDM , /HWBB1, and /HWBB2 signals is shown below.
Signal
Name
/HWBB1 ON
/HWBB2 ON
EDM OFF
Failure Detection Signal for EDM
Detection of failures in the EDM
in the table.
Connection Example
The connection example of EDM
Logic
ON OFF
OFF ON
OFF OFF
For HWBB function signal connections, the input signal is the 0 V common and the output
signal is the source output. This is opposite to other signals described in this manual. To
avoid confusion, the ON and OFF status of signals for HWBB function are defined as follows:
ON: The state in which the relay contacts are closed or the transistor is ON and current
flows into the signal line.
OFF: The state in which the relay contacts are open or the transistor is OFF and no cur-
rent flows into the signal line.
Signal
circuit can be checked using the following four status of the EDM
signal is shown below.
SERVOPACK
8.8 Hard Wire Base Block (HWBB) Function
OFF
OFF
ON
Host controller
24-V power supply
EDM +
EDM -
0 V
signal
8
8-41