User’s Manual
33
4.2.4.3.1.2. HEARTBEAT – BIT 1
This bit changes states every 500ms. There is a rising edge
every 1 second, and can be used to indicate that the system
is still functional and communicating.
4.2.4.3.1.3. FAULT STATUS – BIT 2
This indicates that there are no faults, and that the module is
operating properly.
4.2.4.3.1.4. ACTIVE BRAKING – BIT 3
This indicates that the unit is actively braking, and follows the
red front panel indicator. (Section 4.2.1.3)
4.2.4.3.2. FAULT WORD – WORD 1
This holds the current fault bits. The Fault states are listed in Section
4.2.5.
4.2.4.3.3. TEMPERATURE – WORD 2
This indicates the temperature of the braking module heat sink in
degrees. This is a 16 bit unsigned integer that represents degrees
Fahrenheit. The resolution is to one degree, for example: 93 = 93°F.
The temperature feedback is valid when the heatsink temperature is
above 30°F. Below 30°F, the value will be zero. The value will also
be zero if there is an open thermocouple fault.
4.2.4.3.4. BUS VOLTAGE – WORD 3
This indicates the present bus voltage in volts. This is a 16 bit
unsigned integer. The resolution is to one volt, for example, 675 =
675V.
4.2.4.3.5. DUTY CYCLE – WORD 4
Word 4 indicates the present braking duty cycle of the module, with
0 representing fully off (0%) and 100 representing fully on (100%).
This is an 8 bit unsigned integer.
The duty cycle of the braking module is a 1 second average of the
high frequency pulse width during a braking cycle. This can give an
idea of the system loading during braking.
4.2.4.3.6. FAULT RECORDS – WORDS 5 - 15
These words hold the last 10 fault states, oldest in the lowest
address.
The value stored is the fault state, as listed in Section 4.2.5.
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