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3 Safety Function
MITSUBISHI CNC
3 - 2
3.1 Safety Function
This drive unit offers the safety function which satisfies the following harmonized standard can be offered with this drive
unit.
Each function can be available in the system consisting of the safety function compliant control unit and drive unit, and
various communication cables, sensors, and contactors.
3.1.1 Harmonized Standard
3.1.2 Outline of Safety Function
Safety function assumes the following configuration.
A)The machine is equipped with at least one safety door.
B)Safety is ensured when the safety door is closed.
When an operator requests to open the safety door, enable the safety function and release the lock on the safety door.
Safety is ensured by enabling the safety function while the safety door is open. When canceling the safety door open
request, the safety door enters the locked state and safety function will be released.
Machinery Directive
(2006/42/EC)
EN ISO13849-1:2008(Cat.3, PL d)
EN61800-5-1:2007
EN61800-5-2:2007
EN61326-3-1:2008
EN50178:1997
Function Details
Emergency stop
observation
NC control unit (CNC CPU unit) and the drive unit separately observe the input of emergency stop.
At the emergency stop, the motor power is shut off by controlling the contactor with each of the PLC
CPU unit (only for C70), NC control unit (CNC CPU unit) and the drive unit (power supply unit).
SLS
(Safely Limited Speed)
NC control unit (CNC CPU unit) and the drive unit (servo/spindle drive unit) separately observe the
followings. The motor power is shut off when an error is detected during the observation.
-The command speed does not exceed the speed set with the parameter.
-The rotation speed of the motor does not exceed the rotation speed set with the parameter.
STO
(Safe Torque Off)
The torque is shut off by shutting off the energy supply to the motor. The motor power is
electronically shut off inside the drive unit.
WARNING
The sequence of enabling or disabling the safety function by opening or closing the door is required to take necessary
actions at the machine manufacturers.
WARNING
Precautions for the safety function described in this manual are as follows.
Read carefully all the following fundamental precautions for safety to prevent human injury or property damage.
1. Only a qualified person is authorized to perform the installation, start, repair, or adjustment of the device in which these
equipment are installed.
2. The qualified person must be familiar with the laws of the country where the device into which this product is built is
installed, especially the standards described in this book, and the requirements which are listed in EN ISO 13849-1,IEC/
EN 61508,IEC 61,800-5-2 and IEC 60,204-1.
3. To perform the start, programming, setting and maintenance of the device in accordance with the safety standards, the
staff who undertakes these work should obtain permission from the company it belongs to.