YASKAWA L1000A Quick Start Manual page 49

HFT (Hardware Fault Tolerance)
Classification of Subsystem

Precautions
DANGER! Sudden Movement Hazard. Improper use of the Safe Disable function can result in serious injury or even death. Make sure
the entire system or machinery uses the Safe Disable function in compliance with safety requirements. When implementing the Safe
Disable function into the safety system of a machine, a thorough risk assessment and validation for the whole system must be carried
out to ensure it complies with relevant safety norms (e.g., ISO/EN 13849, IEC/EN 61508, IEC/EN 62061).
DANGER! Sudden Movement Hazard. When using a PM motor, even if the drive output is shut off by the Safe Disable function, a
break down of two output transistors can cause current to flow through the motor winding, resulting in a rotor movement for a
maximum angle of 180 degree (electrically). Ensure this condition will not affect the safety of the application when using the Safe
Disable function. This is not a concern with induction motors.
DANGER! Electrical Shock Hazard. The Safe Disable function can switch off the drive output, but does not cut the drive power supply
and cannot electrically isolate the drive output from the input. Always shut off the drive power supply when performing maintenance or
installations on the drive input side as well as the drive output side.
WARNING! Sudden Movement Hazard. If the motor is subjected to an external force, use a mechanical brake that meets the safety
requirements of entire system or machinery to stop the machine connected to the load. The motor will move when an external
gravitational force in the vertical axis is applied even if the Safety Disable function is in peration. Failure to comply may result in serious
injury or death.
WARNING! Sudden Movement Hazard. Connect the Safe Disable inputs to the devices in compliance with safety requirements.
Failure to comply will result in death or serious injury.
WARNING! Sudden Movement Hazard. When using the Safe Disable inputs, make sure to remove the wire links between terminals
H1, H2, and HC that were installed prior to shipment. Failing to do so will keep the Safe Disable circuit from operating properly and can
cause injury or even death.
WARNING! All safety features (including Safe Disable) should be inspected periodically. If the system is not operating normally, there
is a risk of serious personal injury.
WARNING! Only a qualified technician with a thorough understanding of the drive, the instruction manual, and safety standards should
be permitted to wire, inspect, and maintain the Safe Disable input. Failure to comply may result in serious injury or death.
WARNING! Sudden Movement Hazard. The logic of terminals DM+/DM- is inverted between drive models CIMR-LA and
CIMRLF. Check all wiring to ensure that the sequence is correct after installing the drive and connecting any other devices.
Improper wiring connections could result in death or serious injury.
NOTICE: From the moment terminal inputs H1 and H2 have opened, it takes up to 1 ms for the drive output of models CIMR-LA
to shut off completely, or up to 3 ms for the drive output of models CIMR-LF to shut off completely. The sequence set up to
trigger terminals H1 and H2 should confirm that both terminals remain open for at least 1 ms in order to properly interrupt the drive
output of models CIMR-LA, or for at least 3 ms in order to properly interrupt the drive output of models CIMR-LF. This may
result in the Safe Disable Input not activating.
NOTICE: The Safe Disable Monitor (output terminals DM+ and DM-) should not be used for any other purpose than to monitor the
Safe Disable status or to discover a malfunction in the Safe Disable inputs. The monitor output is not considered a safe output.
NOTICE: When utilizing the Safe Disable function, use only the EMC filters recommended in
NOTICE: Performance Level d can only be achieved if the EDM output is used like shown in the example below.
YASKAWA ELECTRIC TOEP C710616 33G AC Drive L1000A - Quick Start Guide
N = 1
Type B
Safety
switch
S 2
Safe Disable inputs
S 1
Open
Safety relay /
controller
EDM (Safety Electronic
Device Monitor)
9 Safe Disable Input Function
EMC Filter Installation on page
L1000A Drive
H 1
H 2
HC
+ +
DM
DM
− −
14.
EN 49