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SDF 250/400/500
Error and error correction 4-2
F Failures must be repaired immediately.
& Alarm messages are displayed in plain language on the screen of
the operator device. An alarm is given by flashing of the LED
“alarm”.
The display of alarm messages in the operator device can only be
erased by pressing the “ACK” key. The failure is not repaired.
If the alarm message is acknowledged by pressing of the “ACK”
key, but the failure is not yet eliminated, the flashing changes to
steady light. If the failure is repaired the light is off.
Alarm messages are displayed in plain language with date and
time in the alarm protocol.
LED “ALARM”:
flashes in case of an error;
is on if the error has been acknowledged but not yet eliminated;
is off if there are no errors