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CAN Status Message (Actual Values)
One second after startup, the machine sends every 50 ms a CAN status message with
actual values. If the machine receives a CAN control message before the first second
after startup the machine sends the CAN status message immediately.
Power-On Bit
After startup a power-on bit is set in the CAN status frame for one second. The power-
on bit can be used to identify unexpected resets/restarts.
Loss of CAN Communication
If a loss of CAN communication occurs the reference value for mass flow will be set to
100 g/min. A loss of CAN communication will be detected if no valid CAN control mes-
sage have been received for 500 ms. As soon as the CAN communication is available
again the machine switches to normal operation immediately.
Speed reduction by temperature
The maximum speed of the machine depends on the electronic temperature to ensure
safe operation of the machine at any temperatures.
The machine will reduce the speed if the electronic temperature is too high even if the
reference speed value is higher than the actual speed. The speed reduction resulted from
the electronic temperature is indicated by the sixth bit in the CAN status frame. There
will be no indication on the sixth bit if the actual speed limited by the electronic tempera-
ture complies with the maximum speed.
Loss of mass flow sensor
At loss of the mass flow sensor the software switches automatically into the speed con-
trol mode with the predefined speed precontrol value.
Without or in case of loss of mass flow sensor, the actual air temperature (given by the
CAN Actual Values) is 214°C by default.
The loss of mass flow sensor is visible in the CAN Status bit (see CAN Protocol). This fail-
ure is automatically reset as soon as new values are received from the mass flow sensor.
Over current protection
The electronics is protected against a blocked rotor or overload by an overcurrent protec-
tion. If an overcurrent is detected the motor stops immediately. The bit 7 “overcurrent”
in the CAN Status frame is set for about 2 seconds.
One second after the stop of the motor the electronic tries to restart the motor automat-
ically. If the overcurrent error occurs one more time, the motor stops again and the error
bit in the can status frame stays on.
Plausibility check
A blocked rotor cannot be detected under all conditions by an overcurrent detection.
Therefore, an additionally plausibility check is implemented.
The plausibility check checks different ratios inside the motor controller. If a plausibility
check error occur the motor stops immediately and the bit 5 “plausibility error” in the
CAN Status frame is set.
The timing for the error bit and the restart is identical to the overcurrent protection.
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