8 USING STO FUNCTION
8.3 Connection example
293
8
Connection example for CN8 connector
This servo amplifier is equipped with the connector (CN8) which enables the STO function. When this connector is used with
a certified external safety relay, power to the motor can be safely removed and unexpected restart can be prevented. The
safety relay used should meet the applicable safety standards and have forcibly guided contacts or mirror contacts for the
purpose of error detection.
The following diagram is for source interfaces. For sink interfaces, refer to the following.
*1 With TOFB, whether the servo is in the STO state can be confirmed. Refer to the following for a connection example.
Page 296 External I/O signal connection example using an external safety relay unit
The safety level depends on the setting value of [Pr. PF18 STO diagnosis error detection time] and whether STO input diagnosis by
TOFB output is performed or not. For details, refer to [Pr. PF18] in the following user's manual.
MR-J5-G/MR-J5W-G User's Manual (Parameters)
MR-J5-A User's Manual (Parameters)
*2 When using the STO function, turn off STO1 and STO2 at the same time. Also, before turning off STO1 and STO2, stop the servo motor
in the servo-off state or with forced stop deceleration by turning off EM2 (Forced stop 2).
*3 Configure the interlock circuit so that the door opens after the servo motor stops.
External I/O signal connection example using the MR-J3-D05
safety logic unit
This connection is for source interfaces. For the other I/O signals, refer to the following connection examples.
Page 40 Example I/O signal connections
STO1
STO2
*2
*2
*3
STO1
CN8
4
STO2
5
STOCOM
3
CN8
8
6
TOFCOM
7
TOFB2
TOFB1
*1
Servo amplifier
Approx. 3.0 k
Ω
Approx. 3.0 k
Ω
Door
Open
24 V DC
Summary of Contents for Melservo-J5 MR-J5 Series
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