6-33 Safe Torque Off
AC30V series Variable Speed Drive
REGULAR CHECK
A comprehensive check must take precedence if it coincides with a regular check.
A regular check is intended only to demonstrate the STO is functional. It will not always detect the loss of a single channel. It is therefore important for
the user and / or machinery builder to determine the frequency of the comprehensive checks based on their knowledge and application of the machine.
The following tests should be performed.
STO test Regular Check, Activity Expected reaction and effect
1 Ensure that no harm can come to personnel or equipment if the motor turns.
Apply +24V DC to terminals X10/01 and X10/03.
No error must be present in the drive system
3 Apply power to the drive.
X10/05 and /06 must be OFF.
No error must be present in the drive system.
4
Try to start the drive with a non-zero setpoint. This setpoint value will be
referred to as SPT1 for brevity in these tests.
Leave this set throughout all tests.
The drive should start and the motor should turn at SPT1.
X10/05 and /06 must remain OFF.
5
Disconnect X10/01 and X10/03 within 1 second of each other and leave
disconnected for approximately 5 seconds (must exceed 3 seconds)..
Drive must stop immediately, and report STO trip.
X10/05 and /06 must be ON.
6 Re-apply 24V to X10/01 and X10/03.
STO trip indication must remain.
X10/05 and /06 must turn OFF.
7 Try to restart drive.
STO trip indication should clear.
Drive must restart at SPT1.
8
Stop the drive.
Test is complete.
Drive must stop.
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