Power removal function (ETO function: External Torque Off )
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11 Power removal function
(ETO function: External Torque Off )
The power removable function (ETO function: External Torque Off function) is the one that stops supplying the power
to the motor forcibly to put the motor into a non-excitation state if the HWTO input of the CN1 is shut off . This
function, which is diff erent from the FREE input, shuts off the power supply to the motor directly on the circuit.
It can be used for the purpose of preventing dangerous movements of the moving part when maintenance of the
equipment is performed.
Related I/O signals are the HWTO input and EDM output.
Be sure to check the motor is in a standstill state before executing the ETO function. If the ETO
function is executed while the motor is operated, it may cause damage to the motor, driver, or
equipment.
11-1 Block
diagram
4.7 kΩ
HWTO1+
HWTO1-
HWTO2+
HWTO1
HWTO2
EDM
HWTO2-
EDM+
EDM-
4.7 kΩ
ASIC
Motor
Main power
supply
Signal name
Specifi caion
HWTO1+ input, HWTO1− input
HWTO2+ input, HWTO2− input
24 VDC±10%
EDM+ output, EDM− output
30 VDC or less, 50 mA or less
Output saturated voltage 1.1 V
11-2
Related I/O signals
HWTO input
When either of the HWTO1 input or HWTO2 input is turned OFF, the power to the motor is cut off by the electronic
circuit without involving the CPU, causing the motor to stop. In this time, the PWR/ALM LED will blink in green.
When an electromagnetic brake motor is used, the electromagnetic brake continues to hold the position.