IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 47
3.6.3 Safe Disable and Safe Torque Off
The Safe Disable inputs provide a stop function in compliance with “Safe Torque Off” as defined in IEC/EN 61800-
5-2. Safe Disable inputs have been designed to meet the requirements of the ISO/EN 13849-1, Category 3 PLd,
and IEC/EN 61508, SIL2.
Safe Torque Off disables the VFD power section for mechanical maintenance, E-stops, or redundancy safety
monitor controller intervention. The feature provides safe removal of motor torque without removal of power to the
VFD. This is a standard feature on the IMPULSE•G+/VG+ Series 4. A Safe Disable Status Monitor for error
detection in the safety circuit is also provided.
The Safe Disable circuit (
) consists of two independent input channels (H1 and H2) that can block the
output transistors and provide a monitoring output channel (DM+ and DM-) to indicate the status of those input
channels.
The input can use the internal 24VDC power supply of the VFD or an external power supply, and it will support Sink
mode or Source mode. The mode selected for the digital input terminals S1 to S8 by jumper S3 will also be used
for the Safe Disable inputs.
NOTE:
Terminals H1, H2, DM+, and DM- on 575V class models are designed to the functionality, but are not
certified to IEC/EN 61800-5-1, ISO/EN 13849 Cat. 3, IEC/EN 61508 SIL2, Insulation coordination: class 1.
Figure 3-16: Safe Torque Off Block Diagram
Inputs/Outputs
Two Safe Disable inputs and one EDM output according to ISO/EN
13849-1 Cat. 3 PLd, IEC/EN 61508 SIL2.
Operation Time
Time from input open to VFD output stop is less than 1 ms.
Failure Probability
Demand Rate Low
PFD = 5.15E
-5
Demand Rate High/
Continuous
PFH = 1.2E
-9
Performance Level
The Safe Disable inputs satisfy all requirements of Performance Level
(PL) d according to ISO/EN 13849-1 (DC from EDM considered).
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