7 Operating behavior
7.1 Response to sensor failure
This monitor checks the signal level of transducers with 5 V diff. interface. Both,
the open signal lines as well as the short-circuited transducer lines are identi-
fied.
7.2 Behavior at transducer error
If the Zero pulse monitor is activated through configuration of the number of
increments per rotation, the MM 240/A will internally monitor the number of
pulses between two Zero pulses. If the number deviates, an error will be trig-
gered.
7.3 Behavior at short circuit of transducer supply
Both outputs for the transducer supply are sustained short-circuit proof and
protected against overload.
7.4 Monitoring track errors
If the maximum input frequency is exceeded, or if the edges of the incremental
encoders are too close to one another (e.g. if there is no 90° phase difference
between the tracks), this will be identified as error and signaled as such.
MM 240/A Operating behavior
© KEBA 2010
Project engineering manual V1.08 25
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