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5
Power removal function
The power removal function is a function that stops supplying the power to the motor by the hardware.
This function shuts off the drive signal of the inverter circuit that controls the motor current with two input channels
(HWTO1 input, HWTO 2 input). This brings a shutoff state of the power supplying to the motor (power removal status).
The power removal function is assumed to be used to prevent unexpected starting of the moving parts of equipment
when an operator works inside the operating range of the moving parts.
HWTO1+
HWTO1–
HWTO2+
HWTO2–
EDM+
EDM–
* Turning the HWTO1 input OFF causes the upper arm drive signal of the inverter circuit to shut off.
Turning the HWTO2 input OFF causes the lower arm drive signal of the inverter circuit to shut off.
Be sure to check the motor is in a standstill state before executing the power removal function. If the
power removal function is executed while the motor is operated, it may cause damage to the motor,
driver, or equipment.
5-1
Safety parameters
Safety integrity level
Average frequency of a dangerous failure per hour
Hardware fault tolerance
Subsystem
Mission time
Response time
Performance level
Mean time to dangerous failure
Average diagnostic coverage
Stop category
* It is necessary to monitor the EDM output using an external device.
Power supply for
driving upper arm *
Shut-o
Power supply for
driving lower arm *
Shut-o
Item
Drive signal
Control circuit
Specification
SIL 3 *
−9
PFH=2.96×10
[1/h]
HFT=1
Type A
10 years
15 ms or less
PL e (Category 3) *
MTTFd: High
DC
: Medium
avg
0 (IEC 60204-1)
Power removal function
Motor
39
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