Connection Example - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

13.3

Connection example

• Turn off STO (STO1 and STO2) after the servo motor stops by the servo off state or with forced stop
deceleration by turning off EM2 (Forced stop 2). Configure an external sequence that has the timings shown
as below using an external device such as the MR-J3-D05 safety logic unit.
STO1
EM2
Servo motor
speed
• If STO is turned off during operation, the servo motor stops with the dynamic brake stop (stop category 0),
and [AL. 63 STO timing error] occurs.
Connection example for CN8 connector
This servo amplifier is equipped with the connector (CN8) in accordance with 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 or mirror contacts for the purpose of
error detection.
In addition, the MR-J3-D05 safety logic unit can be used instead of a safety relay for implementation of various safety
standards.
Page 586 MR-J3-D05 Safety logic unit
The following diagram is for source interface. For sink interface, refer to the following.
Page 463 Sink I/O interface
STO1
STO2
24 V DC
Door
*3
*1 With TOFB, whether the servo is in the STO state can be confirmed. For connection examples, refer to the following.
Page 459 External I/O signal connection example using an MR-J3-D05 safety logic unit
Page 462 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 the Function column of [Pr. PF18] below.
Page 215 Extension setting 3 parameters ([Pr. PF_ _ ])
*2 When using the STO function, turn off STO1 and STO2 at the same time. Turn off STO1 and STO2 after the servo motor stops by 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.
13 USING STO FUNCTION
458
13.3 Connection example
ON
STO2
OFF
ON
OFF
0 r/min
CN8
Approx.
*2
4
STO1
Approx.
*2
STO2 5
3
STOCOM
Open
Servo amplifier
3.0 k
3.0 k
CN8
*1
6
TOFB1
8
TOFCOM
7
TOFB2