System Wiring

TriVibe Field Cable Options

We highly recommend using one of the cables that have been vetted by Machine Saver's Engineering Team, if you use a cable that is not specified on our list and have communication issues we may be unable to help you resolve them.

If you still wish to select another cable manufacturer, it is critical to get the following specifications correct:

Power pair of conductors: 18 AWG, twisted pair

Digital Modbus pair of conductors: 22 AWG, twisted pair

The cable capacitance should be low 12pF / foot

The cable impedance should be as close to 120 ohms as possible

There should be a foil shield 100% with a drain wire (overall or surrounding the digital Modbus pair)

 

  VTB-CBL-10 VTB-CBL-40 VTB-CBL-50
Cable Capacitance (pF/ft) 11 11 11

Impedance (Ohms)

120 120 105
Temperature Rating (°C) -80 to +200 -40 to +105 -20 to +80
Power Conductor Pair

18AWG
Red + Black
Twisted

No Power Pair Shield

18AWG
Red + Black
Twisted

100% Foil Shield

18AWG
Red + Black
Twisted

No Power Pair Shield

Weight (lbs/meter)

0.10

0.24

0.12

Data (Modbus) Conductor Pair

22AWG
Green + White
Twisted

No Data Pair Shield

22AWG
Green + White
Twisted

100% Foil Shield

22AWG
Blue + White
Twisted

100% Foil Shield

Drain 24AWG 24AWG 24AWG
Overall Shield 100% Foil Shield 100% Foil Shield No Overall Shield
Outer Jacket Material FEP (Red or Black) TPE (Black) PVC (Black)
Outer Jacket Thickness (in) 0.012 0.050 0.040
Outer Jacket Dimensions (in) 0.209 0.365 0.275
Bend Radius (in) 2.09 3.15 2.75
TriVibe Sensor Load (12) @ 1000 ft with a single power supply.

(22) @ 1500 -2000 ft with 2 Power Supplies and Sensor Distribution Dependent.
(12) @ 1000 ft with a single power supply.

(22) @ 1500 -2000 ft with 2 Power Supplies and Sensor Distribution Dependent.
(12) @ 1000 ft with a single power supply.

(22) @ 1500 -2000 ft with 2 Power Supplies and Sensor Distribution Dependent.
Certifications CL2, CMP UL and CSA Class I Div 2 UL444, NEC725 & 800
Suitability Sunlight Resistant, Direct Burial, Wet, Oil, Gas, Abraision, Acid, Indoor Sunlight Resistant, Direct Burial, Wet, Oil,  Abraision, High Stress Movement, Indoor, Outdoor Sunlight Resistant, Direct Burial, Indoor, Outdoor
Cycles N/A 5 Million N/A
Cost $$ $$$ $

 

System Layout Diagram (Simplified & Color-Coded)

Proper TriVibe Layout:

  1. A Modbus Master which has properly designed RS-485 (TIA-485(-A)/EIA-485)
    ports with built-in pullup and pulldown resistors enabled to enforce the RS485 
    (TIA-485(-A)/EIA-485) electrical standard.
  2. A single field cable bus trunk for each RS-485 (TIA-485(-A)/EIA-485) port
    available from the Modbus Master.
  3. Each T-Port connection terminal allows a TriVibe Tri-Axial Vibration Sensor to
    drop off the field cable bus trunk by way of the integral sensor cable.
  4. On each available RS485 (TIA-485(-A)/EIA-485) port, only the last/furthest T-Port 
    connection terminal should have a jumper installed, thereby enabling the 120Ω
    terminating resistor. 
  5. As long as you do not plan to expand with more TriVibe Tri-Axial Vibration
    Sensors on a particular field cable bus trunk, It is permissible to use the last set
    of terminals of 
    the last/furthest T-Port to connect a TriVibe by way of the integral
    sensor cable
  6. Field cable which adheres to RS-485 (TIA-485(-A)/EIA-485) specification and
    Machine Saver's recommended characteristics.
  7. Total length of field cable bus trunk should not exceed 2800 feet (855 meters)
    for Modbus Masters communicating at a baudrate of 115,200 bit/s.
  8. 24 - 36 VDC should be verified available to power each TriVibe Tri-Axial Vibration
    Sensor at each T-Port connection terminal which includes the 
    T-Port which is
    furthest/last 
    on the field cable bus trunk from the Modbus Master.

 

 

Improper TriVibe Layout:

  1. Modbus Master which has IMPROPERLY designed RS-485 (TIA-485(-A)/EIA-485)
    ports. Missing (or disabled) built-in pullup and pulldown resistors leaving the
    bias-voltage at an unknown level.
  2. field cable bus trunk which uses a T-Port connection terminal to attempt to
    split 
    the field cable bus trunk, thereby violating the RS-485 (TIA-485(-A)/EIA-485)
    electrical 
    communication standard.
  3. The above issue also results in furthest T-Port connection terminals to be
    identified, if you attempt this and see there are 2 possible places to install
    a jumper AND/OR if you have more than 1 jumper per RS-485 port
     re-evaluate your
    layout. The layout cannot remain in these conditions and function appropriately.
  4. Field cable adheres to RS-485 (TIA-485(-A)/EIA-485) specification and
    Machine Saver's recommended field wire chart characteristics.
  5. Total length of field cable bus trunk MUST NOT EXCCED 2800 feet
    (855 meters) for Modbus Masters communicating at a baudrate of 115,200
    bit/s.
  6. Allowing the voltage supplied to any TriVibe Tri-Axial Vibration Sensor at any
    T-Port connection terminal to drop below 24 - 36 VDC which includes the 
    furthest T-Port from the Modbus Master
  7. Allowing the current supplied to any TriVibe Tri-Axial Vibration Sensor at any
    T-Port connection terminal to drop below 50 milliamps.

 

T-Port PCB

Tying TriVibe Sensors Together

(20120)TriVibe_tport_pcb_face.png(20120)TriVibe_tport_pcb_side.png

What is it? This is the device to connect field cables and TriVibe sensors together with a Modbus master and maximize efficiency of space and communication.

T-Port Enclosure Options

T-Port PCB

T-Port PCB is the connection interface for a bus line of TriVibe sensors.
These electrical connections allow TriVibe sensors to drop off the communication bus toward the machine.
The final T-Port in a bus (furthest from the Modbus Master, PLC, or Gateway) should have the jumper installed to enable the 12ohm resistor. Enabling this resistor is required by the RS485 standard to ensure proper communication.

(20120)TriVibe_tport_pcb_face.png(20120)TriVibe_tport_pcb_side.png

T-Port Enclosures

There are different forms of enclosures to protect the electrical connection, which runs through the T-Port PCBs, from harsh external environments.

M-687

Suitable for food and beverage applications and those not needed hazardous area ruggedness.M_687.pngM_687 v2.png

T-27

Suitable for hazardous environments.

tport_enclosure.pngtport_enclosure_side.png\

UB-40

Suitable for mining and other harsh environments.

Allbro_UB40_2.pngAllbro_UB40 v1.png