Safe Torque Off - Magnetek Impulse G+ series 4 Instruction Manual

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.
Failure Probability
Safe Torque Off disable the drive 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 drive. 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 (Figure 3-16) 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 drive 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:
IMPULSE®•G+ & VG+ Series 4 Instruction Manual - February 2017
3-22
Inputs/Outputs
Operation Time
Demand Rate Low
Demand Rate High/
Continuous
Performance Level
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.
Two Safe Disable inputs and one EDM output
according to ISO/EN 13849-1 Cat. 3 PLd, IEC/EN
61508 SIl2.
Time from input open to drive output stop is less than
1 ms.
-5
PFD = 5.15E
-9
PFH = 1.2E
The Safe Disable inputs satisfy all requirements of
Performance Level (PL) d according to ISO/EN
13849-1 (DC from EDM considered).