Functions
8.18 Fail-safe functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-101
8.18.1 Monitoring the fail-safe functions
Overview
There are three monitoring procedures:
● Time controlled request for forced dynamisation
● Forced dynamisation
● Process dynamisation
The dynamisation process is designed to detect software and hardware faults of the two
shutdown paths. The forced dynamisation consists of a processor self-test of both
processors within the Control Unit and a hardware test. The hardware test includes a test to
ensure, that if fitted, the Safe Brake Control is functioning correctly.
Note
In fail-safe applications it is necesarry that the forced dynamisation process takes place
during regular intervals. The minimum is once a year.
Time controlled request for forced dynamisation
When the time, set in P9659 (hours or fractions of hours), has expired, a warning A1699 is
issued by the system. This warning can only be cleared by performing a forced
dynamisation. If the forced dynamisation is successful, the timer will be reset to the value in
P9659 and the inverter will be ready to run. If the forced dynamisation fails, the timer will
remain at 0 and the inverter will be disabled from running.
The time remaining until the next forced dynamisation becomes necesarry is displayed in
r9660.
With each forced dynamisation r9660 is reset to the value of P9659.
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