VTi21 Sensor Tables

4-20mA Sensor Tables

Part No.	Variant Description	Quantity	Quantity Description	Value @ 4mA	Value @ 20mA	Units	Suggested AoC
VTI21-VT1	AC Vane Relay Variant	Torque	Instantaneous Torque Exerted on the relay vane.	-25	+25	m.Nm	0.2 m.Nm
VTI21-HVI	HVI Receiver Variant	Average Current	Average HVI Pulsed Current seen by the VTI21 from input channel 1.	0	600	mA	15 mA
VTI21-TI21	TI21 / EbiTrack 200 Variant	Average Current	Average of upper and lower sideband current from VTI21 input channel 1.	0	1500	mA	5 mA
VTI21-FS25	FS2500 Receiver Variant	Center Current	Amplitude of the FS2500 center frequency current from VTI21 input channel 1.	0	1500	mA	5 mA
VTI21-FS26	FS2600 Receiver Variant	Center Current	Amplitude of the FS2500 center frequency current from VTI21 input channel 1.	0	1500	mA	5 mA
VTI21-ACS-001	General Purpose AC sensing up to 1.5A RMS	Current	RMS current from VTI21 input channel 1.	0	2500	mA	25 mA
VTI21-ACS-020	General Purpose AC sensing up to 20A RMS	Current	RMS current from VTI21 input channel 1.	0	20	A	0.2 A
VTI21-UM71	UM71 Variant	Current	Current at selected center frequency.	0	5000	µA	100µA
VTI21-Reed	Reed Relay Variant	Current	Current measured across the Reed relay frequency range on input channel 1.	0	5000	mA	100mA

RS485 Sensor Tables

VTI21-VT1

Slave Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	Torque	Instantaneous torque exerted on the relay vane	-25 to +25	m.Nm	0.2 m.Nm
2	Phase	Phase angle between local coil and control coil currents	0 to 180	Degrees	2 degrees
3	Local Current	RMS current in the local coil	0 to 500	mA	5 mA
4	Control Current	RMS current in the track coil	0 to 1000	mA	5 mA
5	Chatter	Degree of chatter	0 to 100	%	5 %

VTI21-TI21 / VTI21-FS25 / VTI21-FS26

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	Center Frequency	The Center frequency, in hertz, of the track circuit.	388.8 to 508.8	Hz	1 Hz
2	1	Center frequency Current	Total RMS current at the target center frequency	0 to 1000	mA	5 mA
3	1	Lower Side Band current	Total RMS current at the target lower side band frequency	0 to 1000	mA	5 mA
4	1	Upper Side Band current	Total RMS current at the target upper side band frequency	0 to 1000	mA	5 mA
5	1	In Band Current	Total RMS current seen by the transducer between 300 to 600 Hz	0 to 1000	mA	5 mA
6	1	Spectrogram or Gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram. When spectrum data is not being acquired, this channel shows the current amplifier gain setting	4.8 to 1228.8	Hz	NA
7	1	Loudest Frequency	The strongest frequency, in hertz, observed in the incoming waveform.	4.8 to 1228.8	Hz	1 Hz
8	1	Total Current	Total RMS current seen by the transducer.	0 to 1000	mA	5 mA
9	2	Center Frequency	The Center frequency, in hertz, of the track circuit.	388.8 to 508.8	Hz	1 Hz
10	2	Center frequency Current	Total RMS current at the target center frequency	0 to 1000	mA	5 mA
11	2	Lower Side Band current	Total RMS current at the target lower side band frequency	0 to 1000	mA	5 mA
12	2	Upper Side Band current	Total RMS current at the target upper side band frequency	0 to 1000	mA	5 mA
13	2	In Band Current	Total RMS current seen by the transducer between 300 to 600 Hz	0 to 1000	mA	5 mA
14	2	Spectrogram or Gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram. When spectrum data is not being acquired, this channel shows the current amplifier gain setting	4.8 to 1228.8	Hz	NA
15	2	Loudest Frequency	The strongest frequency, in hertz, observed in the incoming waveform.	4.8 to 1228.8	Hz	1 Hz
16	2	Total Current	Total RMS current seen by the transducer.	0 to 1000	mA	5 mA

VTI21-HVI

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1 - ANA	1	HVI Current	RMS Current of the pulsed waveform	0 to 1500	mA	15 mA
2 - ANA	1	HVI Frequency	The frequency of pulses	0 to 5	Hz	0.1 Hz
3 - ANA	1	Noise Current	The RMS current observed between pulses.	0 to 1500	mA	15 mA
4 - ANA	1	Pulse Waveform	If this channel is requested as a capture, the VTi21 will return a high-resolution waveform of the last observed pulse	0 to 1500	mA	Triggered Capture
1 - DIG	1	Pulse Conflict	Set TRUE if pulses are observed to be bleeding through from adjacent track sections	Digital	NA	On Change
5 - ANA	2	HVI Current	RMS Current of the pulsed waveform	0 to 1500	mA	15 mA
6 - ANA	2	HVI Frequency	The frequency of pulses	0 to 5	Hz	0.1 Hz
7 - ANA	2	Noise Current	The RMS current observed between pulses.	0 to 1500	mA	15 mA
8 - ANA	2	Pulse Waveform	If this channel is requested as a capture, the VTi21 will return a high-resolution waveform of the last observed pulse	0 to 1500	mA	Triggered Capture
2 - DIG	2	Pulse Conflict	Set TRUE if pulses are observed to be bleeding through from adjacent track sections	Digital	NA	On Change

VTI21-ACS-001

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Current	RMS current observed on Channel 1	0 to 2500	mA	5 mA
2	2	CH 2 Current	RMS current observed on Channel 2	0 to 2500	mA	5 mA
3	NA	Derived Current	RMS current derived for an unmonitored 3rd phase in a balanced three-phase system.	0 to 2500	mA	5 mA
4	NA	CH1 Leads CH2	Digital Output - TRUE if the waveform on CH1 is observed to lead that of CH2	TRUE or FALSE	NA	NA
5	NA	CH1 Lags CH2	Digital Output - TRUE if the waveform on CH1 is observed to lag that of CH2	TRUE or FALSE	NA	NA

VTI21-ACS-020

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Current	RMS current observed on Channel 1	0 to 20	A	0.2 A
2	2	CH 2 Current	RMS current observed on Channel 2	0 to 20	A	0.2 A
3	NA	Derived Current	RMS current derived for an unmonitored 3rd phase in a balanced three-phase system.	0 to 20	A	0.2 A
4	NA	CH1 Leads CH2	Digital Output - TRUE if the waveform on CH1 is observed to lead that of CH2	TRUE or FALSE	NA	NA
5	NA	CH1 Lags CH2	Digital Output - TRUE if the waveform on CH1 is observed to lag that of CH2	TRUE or FALSE	NA	NA

VTI21-UM71

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Frequency	Channel 1 Frequency Selected	1700 to 2600	Hz	1
2	1	CH 1 Side Band Ratio	Ratio of lower to upper frequency (0%=all lower, 100%=all upper)	0 to 100%	%	5
3	1	CH 1 Raw Frequency	Simple Frequency Measurement (zero crossings)	1600 to 2700	Hz	100
4	1	CH 1 Total Current	Total current in the UM71 band	0 to 5mA	µA	100
5	1	CH 1 current 1700Hz	Current measured at 1700Hz	0 to 5mA	µA	100
6	1	CH 1 current 2000Hz	Current measured at 2000Hz	0 to 5mA	µA	100
7	1	CH 1 current 2300Hz	Current measured at 2300Hz	0 to 5mA	µA	100
8	1	CH 1 current 2600Hz	Current measured at 2600Hz	0 to 5mA	µA	100
9	1	CH 1 Spectrogram or Gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram.	1 to 32		1
10	2	CH 2 Frequency	Channel 1 Frequency Selected	1700 to 2600	Hz	1
11	2	CH 2 Side Band Ratio	Ratio of lower to upper frequency (0%=all lower, 100%=all upper)	0 to 100%	%	5
12	2	CH 2 Raw Frequency	Simple Frequency Measurement (zero crossings)	1600 to 2700	Hz	100
13	2	CH 2 Total Current	Total current in the UM71 band	0 to 5mA	µA	100
14	2	CH 2 current 1700Hz	Current measured at 1700Hz	0 to 5mA	µA	100
15	2	CH 2 current 2000Hz	Current measured at 2000Hz	0 to 5mA	µA	100
16	2	CH 2 current 2300Hz	Current measured at 2300Hz	0 to 5mA	µA	100
17	2	CH 2 current 2600Hz	Current measured at 2600Hz	0 to 5mA	µA	100
18	2	CH 2 Spectrogram or Gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram.	1 to 32		1

VTI21-Reed

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC
1	1	CH 1 Frequency	Simple Frequency Measurement (zero crossings)	0 to 5000	Hz	1
2	1	CH 1 Total Current	Total current measured in the reed relay frequency range	0 to 5A	mA	50
3	1	CH 1 - channel 211	Total Current at 363Hz	0 to 5A	mA	50
4	1	CH 1 - channel 212	Total Current at 366Hz	0 to 5A	mA	50
5	1	CH 1 - channel 213	Total Current at 369Hz	0 to 5A	mA	50
6	1	CH 1 - channel 214	Total Current at 372Hz	0 to 5A	mA	50
7	1	CH 1 - channel 215	Total Current at 375Hz	0 to 5A	mA	50
8	1	CH 1 - channel 216	Total Current at 378Hz	0 to 5A	mA	50
9	1	CH 1 - channel 217	Total Current at 381Hz	0 to 5A	mA	50
10	1	CH 1 - channel 218	Total Current at 384Hz	0 to 5A	mA	50
11	1	CH 1 - spectrogram / gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram. note: includes only measured frequencies, which are: 363, 366, 369, 372, 375, 378, 381, 384, 408, 417, 423Hz
12	2	CH 2 Frequency	Simple Frequency Measurement (zero crossings)	0 to 5000	Hz	1
13	2	CH 2 Total Current	Total current measured in the reed relay frequency range	0 to 5A	mA	50
14	2	CH 2 - channel 211	Total Current at 363Hz	0 to 5A	mA	50
15	2	CH 2 - channel 212	Total Current at 366Hz	0 to 5A	mA	50
16	2	CH 2 - channel 213	Total Current at 369Hz	0 to 5A	mA	50
17	2	CH 2 - channel 214	Total Current at 372Hz	0 to 5A	mA	50
18	2	CH 2 - channel 215	Total Current at 375Hz	0 to 5A	mA	50
19	2	CH 2 - channel 216	Total Current at 378Hz	0 to 5A	mA	50
20	2	CH 2 - channel 217	Total Current at 381Hz	0 to 5A	mA	50
21	2	CH 2 - channel 218	Total Current at 384Hz	0 to 5A	mA	50
22	2	CH 2 - spectrogram / gain	Capture waveform showing the magnitude spectrum of the input signal. Use a "Triggered Capture" to acquire the Spectrogram. note: includes only measured frequencies, which are: 363, 366, 369, 372, 375, 378, 381, 384, 408, 417, 423Hz

Aster

Slave Channel	VTI21 Input Channel	Quantity	Description	Typical Range	Units	Suggested AoC Threshold
1	1	Lock-on Frequency	Ideal operating frequency track circuit	1700 to 2600	Hz	1
2	1	In-band Current	RMS current in the operating band	0-5000	uA	50
3	1	Principle Frequency	Loudest frequency observed (actual operating frequency)	1700 to 2600	Hz	1
4	1	Total Current	broad-and RMS current	0-5000	uA	50
5	1	1700 Hz Band Current	RMS current in the 1700 Hz band	0-5000	uA	50
6	1	2000 Hz Band Current	RMS current in the 1900 Hz band	0-5000	uA	50
7	1	2300 Hz Band Current	RMS current in the 2100 Hz band	0-5000	uA	50
8	1	2600 Hz Band Current	RMS current in the 2300 Hz band	0-5000	uA	50
9	1	Gain / FFT	Pre-amp Gain as AoC, Spectrogram is acquired as a triggered capture	10	Hz	NA
10	2	Lock-on Frequency	Ideal operating frequency track circuit	1700 to 2600	Hz	1
11	2	In-band Current	RMS current in the operating band	0-5000	uA	50
12	2	Principle Frequency	Loudest frequency observed (actual operating frequency)	1700 to 2600	Hz	1
13	2	Total Current	broad-and RMS current	0-5000	uA	50
14	2	1700 Hz Band Current	RMS current in the 1700 Hz band	0-5000	uA	50
15	2	2000 Hz Band Current	RMS current in the 1900 Hz band	0-5000	uA	50
16	2	2300 Hz Band Current	RMS current in the 2100 Hz band	0-5000	uA	50
17	2	2600 Hz Band Current	RMS current in the 2300 Hz band	0-5000	uA	50
118	2	Gain / FFT	Pre-amp Gain as AoC, Spectrogram is acquired as a triggered capture	10	Hz	NA