Copley Controls AccelnetPlus AEV-090-14 Manual page 6

Accelnet
SAFE TORQUE OFF (STO)
The Safe Torque Off (STO) function is defined in IEC 61800-5-2.
Two channels are provided which, when de-energized, prevent
the upper and lower devices in the PWM outputs from producing
torque in the motor.
INSTALLATION
Refer to the 16-01687 Accelnet Plus Micro Modules AEV & APV User Guide
The information provided in the 16-01687 Accelnet Plus Micro Modules AEV & APV User Guide must be considered for
any application using the AEV drive STO feature.
DANGER
FAILURE TO HEED THIS WARNING CAN CAUSE EQUIPMENT DAMAGE, INJURY, OR DEATH.
STO DISABLE
In order for the PWM outputs of the AEV to be activated, current
must be flowing through the opto-couplers that are connected to
the STO-IN1 and STO-IN2 terminals and the drive must be in an
ENABLED state. When either of the opto-couplers are OFF, the
drive is in a Safe Torque Off (STO) state and the PWM outputs
cannot be activated by the control core to drive a motor.
STO DISABLE CONNECTIONS
Current must flow
through all of the
opto-couplers
before the drive
can be enabled
J3 STO
Signal Pin
STO_1 1 3
STO1_RTN 2 4
STO OPERATION
STO Input Voltage
STO_1 AND STO_2 ≥ 3.3 Vdc
STO_1 OR STO_2 ≤ 2.0 Vdc
STO_1 OR STO_2 Open
Note: Voltages in the table above are referenced between an STO-INx+ and an STO-INx-.
E.g. V(STO-IN1) = V(STO-IN1+) - V(STO-IN1-)
STO STATUS
A digital output can be programmed to be active when the drive is disabled by the STO function.
The active level of the output is programmable to be HI or LO.
Note: STO Status is not part of the STO Safety Function.
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
P/N 16-01681 Rev 15
Plus
5 Vdc
+
-
STO Disabling
Connections
Signal
STO_2
STO2_RTN
STO State
STO Inactive. Drive can be enabled to produce torque
STO Active. Drive cannot be enabled to produce torque
Micro
Module EtherCAT
This provides a positive OFF capability that cannot be overridden
by the control firmware, or associated hardware components.
When the opto-couplers are energized (current is flowing in the
input diodes), the control core will be able to control the on/off
state of the PWM outputs to produce torque in the motor.
This diagram shows connections that will energize all of the opto-
couplers from a +5V source. When this is done the STO feature is
disabled and control of the output PWM stage is under control of
the digital control core.
If not using the STO feature, these connections must be
made in order for the drive to be enabled.
FUNCTIONAL DIAGRAM
AEV J3
+14 Vdc
Channel 2
STO_2
2k
2k
STO2_RTN
Channel 1
STO_1
2k
2k
STO1_RTN
STO
Diagnostic
Functional Safety Circuit
Boundary
Tel: 781-828-8090
AEV
Power
Supply
Gate
Drivers
Vcc
/SD
HI
LO
Vcc
/SD
HI
LO
PWM
Signals
CPU
Fax: 781-828-6547
+HVaux
+HV
PWM
Outputs
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