Rockwell Automation 20A-DG01, Руководство пользователя

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Rockwell Automation Publication PFLEX-UM003D-EN-P - June 2021 19
Description of Operation
Description of Operation
PowerFlex 40P Safe Torque Off Operation
The DriveGuard Safe Torque Off option for PowerFlex 40P (see Figure 8 ) disables the
drive’s output IGBT’s by breaking the link with the drive microcontroller. When used in
combination with a second safety channel (the Enable input), the system satisfies the
requirements of EN ISO 13849-1, Category 3 / PL (d) for Safe Torque Off and helps
protect against restart.
Under normal drive operation, the Safe Torque Off relay is energized, the enable input
is energized, and the drive is able to run. If either inputs is de-energized, the gate
control circuit is disabled. To meet EN ISO 13849-1, Category 3 / PL (d) operation, both
safety channels must be de-energized. See the following examples for details.
Figure 8 - PowerFlex 40P Drive Safe Torque Off Circuitry
IMPORTANT
By itself, the Safe Torque Off option initiates a coast-to-stop action.
Additional protective measures will need to be applied when an application
requires a change to the stop action.
+24V DC
PowerFlex 40P
AC Drive
Stop
Start
AC Line
Input Power
Common
Enable
M
Gate Control
From Microcontroller
Gate Control
Circuit
Safety
Channel
Safety
Channel
1
2
3
4
Safe Off Option