Diagnostic Tests - Danfoss iC7 Series Operating Manual

iC7 Series Functional Safety
Operating Guide
Test procedure
3 Start the motor.
4 Remove the 24 V DC voltage supply to STO input channel A terminals while the frequency converter drives the
motor (that is, the mains supply is not interrupted).
5 Verify that the motor coasts.
It may take a long time for the motor to stop.
6 If a control panel is mounted, check if STO – Fault Ch A is shown on the control panel.
7 If the control panel is not mounted, check if STO – Fault Ch A is listed in the event log.
8 Give a start command to verify that the STO function blocks the drive's operation. The motor must not start.
9 Reapply 24 V DC to STO inputs.
10 Send a reset signal via fieldbus, digital I/O, or control panel.
11 Ensure that the motor becomes operational and runs within the original speed range.
12
Remove the 24 V DC voltage supply to STO input channel B terminals while the frequency converter drives the
motor (that is, the mains supply is not interrupted).
13 Verify that the motor coasts.
It may take a long time for the motor to stop.
14
If a control panel is mounted, check if STO – Fault Ch B is shown on the control panel.
15
If the control panel is not mounted, check if STO – Fault Ch B is listed in the event log.
16 Give a start command to verify that the STO function blocks the drive's operation. The motor must not start.
17 Reapply 24 V DC to STO inputs.
18 Send a reset signal via fieldbus, digital I/O, or control panel.
19 Ensure that the motor becomes operational and runs within the original speed range.

6.2 Diagnostic Tests

If the STO feedback signal is utilized, conduct an extra test for SIL3 every 24 months to detect any STO feedback functionality fail-
ures.
Table 10: Diagnostic Test for STO Feedback Signal
Test procedure
1 Power on the frequency converter.
2 Check that no safety faults are present.
3 Start the motor.
4 Verify that the STO Feedback output does not signal an active STO.
5 Remove the 24 V DC voltage supply to STO input channel A terminals while the frequency converter drives the
motor (that is, the mains supply is not interrupted).
6 Verify that the motor coasts.
It may take a long time for the motor to stop.
7 If a control panel is mounted, check if STO – Fault Ch A is shown on the control panel.
18 | Danfoss A/S © 2023.03
Operation and Maintenance
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AQ319741840653en-000201 / 136R0268