YASKAWA E-V Series User Manual page 84

3 Wiring and Connection
3.4.3 Connection Examples of Output Circuits to SERVOPACK
(3) Line Driver Output Circuit
CN1 connector terminals, 33-34 (phase-A signal), 35-36 (phase-B signal), and 19-20 (phase-C signal) are
explained below.
Encoder serial data converted to two-phase (phases A and B) pulse output signals (PAO, /PAO, PBO, /PBO)
and origin pulse signals (PCO, /PCO) are output via line-driver output circuits. Normally, the SERVOPACK
uses this output circuit in speed control to comprise the position control system at the host controller. Connect
the line-driver output circuit through a line receiver circuit at the host controller.
(4) Safety Output Circuit
External device monitor (EDM1), an output signal of safety function, is explained below. EDM1 is a function
for monitoring a failure of HWBB function. Connect it to safety device as a feedback signal.
The relation between EDM1 and /HWBB1, /HWBB2 signals are explained below.
Signal Name
/HWBB1
/HWBB2
EDM1
EDM1 Signal
Detection of failures in the EDM1 circuit can be checked using the following four status of the EDM1 signal
in the table. Failures can be detected if the failure status can be confirmed, e.g., when the power supply is
turned ON.
The EDM1 signal is not a safety output. Use it only for monitoring a failure.
3-36
Line Receiver Circuit Example
SERVOPACK
Logic
ON ON OFF
ON OFF ON
OFF OFF OFF
Host Controller
Applicable line receiver
SN75ALS175 or the
equivalent
220 to
470
OFF
OFF
ON
WARNING
When both /HWBB1 and
/HWBB2 signals are OFF,
EDM1 signal turns ON.