84
Safe Torque Off (STO)
3ADW000488R0101 DCS880 Service manual e a
Acceptance test
Follow the Safety instructions, Ignoring the instructions can cause physical injury or
death, or damage to the equipment.
Ensure that the drive can be run and stopped freely during start-up.
Stop the drive (if running), switch off mains- and auxiliary power and isolate the drive from the power
lines by disconnectors.
Check the STO circuit connections against the wiring diagram.
Close the disconnectors and switch on mains- and auxiliary power.
Test the operation of the STO function when the motor is stopped.
− Give a stop command for the drive (if running) and wait until the motor shaft is at a standstill.
− Ensure that the drive operates as follows:
− Open the STO circuit. The drive generates an indication if one is defined for ‘stopped’ state
in 31.22 STO indication run/stop (see DCS880 Firmware Manual
).
− Give a start command to verify that the STO function blocks the drive operation. The motor
should not generate torque.
− Close the STO circuit.
− Reset any active faults. Restart the drive and check that the motor runs normally.
Test the operation of the STO function when the motor is running.
− Start the drive and ensure the motor is running.
− Ensure that the drive operates as follows:
− Open the STO circuit. The motor should stop and should not generate torque. The drive
generates an indication if one is defined for ‘running’ state in 31.22 STO indication run/stop
(see DCS880 Firmware Manual
).
− Reset any active faults and try to start the drive.
− Ensure that the motor stays at standstill and the drive operates as described above in
testing the operation when the motor is stopped.
− Close the STO circuit.
− Reset any active faults. Restart the drive and check that the motor runs normally.
Test the operation of the failure detection of the drive. The motor can be stopped or running.
− Open the 1
st
channel of the STO circuit (wire connected to IN1). If the motor was running, it
should coast to a stop. The drive generates fault FA81 Safe torque off 1 loss (see
DCS880
Firmware Manual).
− Give a start command to verify that the STO function blocks the drive’s operation. The motor
should not generate torque.
− Close the STO circuit.
− Reset any active faults. Restart the drive and check that the motor runs normally.
− Open the 2
nd
channel of the STO circuit (wire connected to IN2). If the motor was running, it
should coast to a stop. The drive generates fault FA82 Safe torque off 2 loss (see
DCS880
Firmware Manual).
− Give a start command to verify that the STO function blocks the drive’s operation. The motor
should not generate torque.
− Close the STO circuit.
− Reset any active faults. Restart the drive and check that the motor runs normally.
Document and sign the acceptance test which verifies that the safety function is safe and accepted
for operation in the machine log book.
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