Functions
8.18 Fail-safe functions
Control Units CU240S
8-112 Operating Instructions, 11/2006, A5E00766042B AA
When SS1 is deactivated after the "minimum speed for standstill detection" (P9682/P9882)
is reached, the following actions are performed by the inverter:
1. STO is deactivated.
2. The forced dynamisation procedure is carried out (if parameterised by p9601 and p9801).
3. The forced dynamisation timer (p9660) is reset to the value in p9659 (if the forced
dynamisation procedure was carried out successfully).
4. The mechanical brake (if fitted) is opened, if not closed by holding brake function
(P1215).
5. The status LED SS1 changes from flashing to on state.
6. The status LED ES is switched off.
Note
The state of the fail-safe functions is announced by r9772.
Note
The fail-safe function SS1 should not be activated during following processes are active:
• Search process in flying restart
• Motor data identification
• Speed control optimisation
It is recommended not to use the torque contol (P1300 = 22, 23 or P1501 > 0) as a control
mode for the fail-safe function SS1.
Caution
Reaction time
The reaction time for a SS1 is 20 ms.
Fault reaction time
An internal failure during a SS1, which leads to a LSTO, will be detected within the time
specified in "Fault reaction time" of section "Limiting values for SS1 and SLS".
The overall reaction time is the sum of reaction time and fault reaction time.
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