X20 system modules • Motor controllers • X20MM4456
X20 system User's Manual 3.10
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4.25.5.11 Monitoring the module supply
The module supply is continually monitored. If the following limits are exceeded in either direction, an error bit is set.
Upper limit:
>80 V
Warning stage:
>60 V
Lower limit:
<18 V
4.25.5.12 Overvoltage cutoff
If the supply voltage on the module exceeds 80V (e.g. through feedback during generator operation), then all PWM
outputs are disabled (PWM output pins are short-circuited). The outputs are reactivated as soon as the supply
voltage is back in the valid range. Switching the outputs on again can cause an open load error in current mode
(depending on the current setpoint and load inductance) as well as with any other abrupt change to the current
setpoint value.
4.25.5.13 Overtemperature cutoff (at 85°C)
If the module temperature reaches or exceeds the limit value of 85°C, then the module executes the following
actions:
•
Setting the "overtemperature" error bit
•
The PWM outputs are disabled (short-circuited)
Once the module temperature sinks to 83°C, the error bit is automatically cleared by the module and the outputs
become operational again.
4.25.5.14 Measurement of effective current
In current controller mode (see bit 12 in the configuration register), there is an apparent deviation between the
current setpoint and the measured effective current.
This is due to how the module operates. The PWM output remains "On" or in "Fast Decay" as long as needed to
reach the current setpoint. Therefore, the current setpoint is the maximum or minimum current in a specified PWM
cycle. This is why the effective current of this cycle (average current of this cycle) is lower (PWM = "On") or higher
(PWM = "Fast Decay") than the current setpoint.
The size of the deviation depends on the load impedance.
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