Wire the safe torque off option – Rockwell Automation 20C-DG01 PowerFlex 700H AC Drive Safe Torque Off Option User Manual
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Rockwell Automation Publication 20C-UM001B-EN-P - June 2011
Chapter 2 Installation and Wiring
Wire the Safe Torque Off
Option
The Safe Torque Off option disables the drive’s output IGBT’s by disconnecting
the gate control power supply (see
). The system satisfies the
requirements of EN ISO 13849-1 PL d/Category 3 for Safe Torque Off and
protection against restart.
Under normal drive operation, the Safe Torque Off inputs (SD1 and SD2) are
energized and gate control power is available to the gate control circuit. If either
or both of these inputs is/are de-energized, the gate control circuit is disabled and
the drive will stop as programmed (coast or controlled). The drive can be
configured to display a “Gate Disable” fault or alarm (F59) on the HIM when the
gate control circuit is disabled.
Both Safe Torque Off inputs must be used to meet EN ISO 13849-1 PL d/
Category 3 operation and must be energized in order to run the drive. Refer to
the wiring examples on the following pages for details.
The Safe Torque Off activation delay time is less than 20 ms. When the drive is
enabled, there is a delay time of 1 second before a valid start command can be
issued.
PowerFlex 700H drives containing the Safe Torque Off option board will only
accept an edge sensitive start command when the drive is in a “ready” state.
Important points to remember about wiring:
• Always use copper wire.
• 0.5 mm
2
(20 AWG), 3 conductor, shielded cable is required.
• Wire with an insulation rating of 600V or greater is recommended.
• Control and signal wires should be separated from power wires by at least
0.3 m (1 ft).
• According to EN 60204-1, part 13.5: The voltage drop from the supply
point to the load should not exceed 5%.
• Due to electromagnetic disturbances, the cable length should be limited to
200 m (656 ft) maximum. In a noisy environment, the length of the cable
should be less than 200 m (656 ft).
IMPORTANT
By itself, the Safe Torque Off option initiates a coast-to-stop action. If
coasting to a stop is not desired, additional protective measures must be
taken. See
for a controlled stop wiring example.