Function Applications
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Acceptance testing of safety functions must be performed by personnel with safety function expertise
and must be documented and signed by the testers. Technicians and operation/maintenance/repair
personnel must be trained to understand the requirements and principles for the design and operation
of safety-related systems.
The signed acceptance test report must be kept in the log of the equipment. The report shall include
documentation of start-up activities and test results, fault reports, and troubleshooting records. Any
new acceptance tests due to changes or maintenance shall be recorded in the log.
Table 4–44 Acceptance test checklist
Step Test
Result
1
Ensure that the AC drive can run and stop freely during commissioning.
2
Stop the AC drive (if running), turn off the input power, and isolate the AC
drive from the power cable through a disconnecter.
3
Check the STO circuit connection according to the circuit diagram.
4
Check that the shield of the STO input cable is grounded to the drive frame.
5
Turn off the disconnecter and connect the power supply.
When the motor stops, test the STO 1 channel signal:
Set STO1 and STO2 to H.
Issue an AC drive stop command (if running) and wait for the motor shaft to
stop.
Enable the STO function by disconnecting (low state or open circuit) the STO
1 channel input signal and issue a start command for the AC drive.
Make sure the motor stays still and the AC drive display shows "STO".
The STO1 channel signal is restored and the fault is cleared. Use the ON/RUN
command of the AC drive, and check that the motor works normally.
When the motor stops, test the STO 2 channel signal:
Set STO1 and STO2 to H.
Issue an AC drive stop command (if running) and wait for the motor shaft to
stop.
Enable the STO function by disconnecting (low state or open circuit) the STO
2 channel input signal and issue a start command for the AC drive.
Make sure the motor stays still and the AC drive display shows "E47.02".
The STO2 channel signal is restored and the fault is cleared. Use the ON/RUN
command of the AC drive, and check that the motor works normally.
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