Waveform Capture

The system stores the variables V1N, V2N, V3N, I1, I2, I3, IN during four cycles (64 points per cycles) in the file number 5.

This file consists of a fixed number of records (29). All records are of similar size that is 64 registers wide.

The capture is triggered as follows:

manually (user request) by using the command Forcelog (see the MasterPact Legacy Modbus User Guide)
automatically attached to analog predefined alarms (1 to 53) by setting the log action to 1

The following table describes the file header content:

Address	Register	RW	X	Unit	Type	Range	A/E/P/H	Description
0x1BDB	7132	RW	–	–	INT16U	–	H	File status: 0x0000 = file disabled 0xFFFF = file enabled (factory setting)
0x1BDC	7133	R	–	–	INT16U	–	H	Type of file: 5 = waveform capture
0x1BDD	7134	R	1	–	INT16U	–	H	Size of a file = 29 records
0x1BDE	7135	R	1	–	INT16U	–	H	Size of a record = 64 registers
0x1BDF	7136	R	–	–	INT16U	1	H	File filling mode: 0 = circular 1 = disabled if log is full
0x1BE0	7137	R	1	–	INT16U	–	H	Number of cycle segments: 1 = 4 cycles for waveform capture
0x1BE1	7138	R	1	–	INT16U	–	H	Number of cycles before capture: 2 = waveform capture and fault waveform capture
0x1BE2	7139	R	1	–	INT16U	–	H	Number of points per cycle: 64 = waveform capture

The following table describes the file status content:

Address	Register	RW	X	Unit	Type	Range	A/E/P/H	Description
0x1BEB	7148	R	1	–	INT16U	–	H	Size of a file = 29 records
0x1BEC	7149	R	1	–	INT16U	–	H	Size of a record = 64 registers
0x1BED	7150	R	1	–	INT16U	–	H	0x0000 = file OK 0x000A = record size smaller than expected 0x0014 = record size larger than expected 0x001E = insufficient memory 0x00FA = internal error 0x00FD = corrupted allocation table 0x00FE = configuration zero 0x00FF = invalid configuration 0xFC00 = invalid file number 0xFD00 = invalid record number 0xFE00 = file not supported 0xFF00 = cannot allocate file
0x1BEE	7151	R	1	–	INT16U	–	H	Number of records in the file = 29
0x1BEF	7152	R	1	–	INT16U	–	H	Sequence number of first record in the file (the oldest) = 1
0x1BF0	7153	R	1	–	INT16U	–	H	Sequence number of last record in the file (the most recent) = 29
0x1BF1– 0x1BF3	7154– 7156	R	–	–	DATE	–	H	Date the last file was reset. Factory setting = 0x8000 0x8000 0x8000

The waveform capture has a fixed number of records and all record has a fixed number of registers:

Record Number	Registers	Type	Description
1	1–4	XDATE	Extended date/time
	5–11	–	Reserved
	12	INT16U	ID of fault WFC trigger: Alarm number 1000 to 1031
	13	–	System type: 31, 40 or 41
	14	A	Circuit breaker nominal current
	15	SFIXPT	Voltage multiplier for phase 1
	16	INT16	Voltage offset for phase 1
	17	SFIXPT	Voltage multiplier for phase 2
	18	INT16	Voltage offset for phase 2
	19	SFIXPT	Voltage multiplier for phase 3
	20	INT16	Voltage offset for phase 3
	21	SFIXPT	Current multiplier for phase 1
	22	INT16	Current offset for phase 1
	23	SFIXPT	Current multiplier for phase 2
	24	INT16	Current offset for phase 2
	25	SFIXPT	Current multiplier for phase 3
	26	INT16	Current offset for phase 3
	27	SFIXPT	Current multiplier for neutral
	28	INT16	Current offset for neutral
	29	INT16U	Scaling factor used for SFIXPT math on voltage samples
	30	INT16U	Scaling factor used for SFIXPT math on phase-current samples
	31	INT16U	Scaling factor used for SFIXPT math on neutral-current samples
	32–64	–	Not used
2–4	1–64	INT16U	Voltage V1N sample points (16 points - 12 cycles)
5–7	1–64	INT16U	Voltage V2N sample points (16 points - 12 cycles)
8–10	1–64	INT16U	Voltage V3N sample points (16 points - 12 cycles)
11–13	1–64	INT16U	Current I1 sample points (16 points - 12 cycles)
14–16	1–64	INT16U	Current I2 sample points (16 points - 12 cycles)
17–19	1–64	INT16U	Current I3 sample points (16 points - 12 cycles)
20–22	1–64	INT16U	Current IN sample points (16 points - 12 cycles) Valid only with system type 41

Apply the following rules to derive the voltages:

on phase 1:

Sample (Volt) = [(sample – mean value of Voltage V1N sample points) x register number 15 of first record]/(1000 x register number 29 of first record).
on phase 2:

Sample (Volt) = [(sample – mean value of Voltage V2N sample points) x register number 17 of first record]/(1000 x register number 29 of first record).
on phase 3:

Sample (Volt) = [(sample – mean value of Voltage V3N sample points) x register number 19 of first record]/(1000 x register number 29 of first record).

Apply the following rules to derive the currents:

on phase 1:

Sample (Ampere) = [(sample – mean value of Current I1 sample points) x register number 21 of first record] / ((1000 x register number 30 of first record) / Circuit breaker nominal current).
on phase 2:

Sample (Ampere) = [(sample – mean value of Current I2 sample points) x register number 23 of first record] / ((1000 x register number 30 of first record) / Circuit breaker nominal current).
on phase 3:

Sample (Ampere) = [(sample – mean value of Current I3 sample points) x register number 25 of first record] / ((1000 x register number 30 of first record) / Circuit breaker nominal current).
on neutral:

Sample (Ampere) = [(sample – mean value of Current IN sample points) x register number 27 of first record] / ((1000 x register number 31 of first record) / Circuit breaker nominal current).