MFC Kit Instructions
5.0 PQconnect Option
49
Table 25: History Record Formatting
Byte Value
Format
0
Timestamp Seconds (4 bytes)
Seconds value of timestamp. Timestamp
seconds:milliseconds value is the time since power on of the
event.
1
2
3
4
Timestamp Power Cycle Count
Range 0 to 255. Indicates the number times the PQconnect
has been reset / power cycled.
5
Timestamp Milliseconds
Millisecond value of timestamp in units of 10s of milliseconds.
6
Detection Status
For format see Parameter 210 Detection Status
7
8
Filter Output THVD Phase A
Filter Output Voltage THD at the time of the event in units of
percent THD (100 = 100%)
9
Filter Output THVD Phase B
10
Filter Output THVD Phase C
11
Filter Output Average RMS
Voltage
Filter output average RMS voltage in units of percent rated
voltage (100=100% or nominal voltage).
12
Filter Output Voltage
Fundamental
Fundamental Frequency divided by 2 in Hz. For example a
value of 30 would equate to 30 x 2 = 60Hz Fundamental
Frequency. The factor of two is used to compress the 0 to
500Hz fundamental frequency value to fit in an 8 bit value.
13
Estimated Carrier Frequency
VFD Carrier frequency in units of 100Hz. For example a value
of 20 would equate to a carrier frequency of 20x100 =
2000Hz. The factor 100 is used to compress the data to fit in
an 8 bit value.
14
16 Bit, Two’s Compliment
Checksum
History Record Checksum. When this 16 bit value is added
together with the reset of the history records as 16 bit values
the result should be zero if no data errors exist in the packet.
15
Example Application Using “Simply Modbus Master 8.1.0”
The Modbus RTU network interface port is configured for RS-485 signal levels. The following
example uses an RS-485 to USB converter to connect the PQconnect to a laptop PC running the
Modbus RTU master application. The picture below shows an
example “US Converters Model:
XS890” model RS-485 to USB converter. As another alternative RS-485 converter there is
WINGONEER USB 2.0 to RS485 Serial Converter Adapter CP2104.
Figure 22: B&B SmartWorx, Inc Model: USPTL4 model RS-422/485 converter
With the example converter above, the user can make proper connections from the RS485
converter to the PQconnect J5 communication header. The table below indicates the positions
where the RS485 connections lead to. Please ensure the correct dip switch settings are applied
before installing.
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