How We Do Business

TVC is prepared to work under firm fixed-price proposals, time and material contracts, design/build and design only contracts. TVC's sales strategy is one of referral by satisfied customers, vendor partners and direct sales by its own Sales and Marketing Department.

TVC strives to help our customers achieve success with their automation projects. To realize this end, we carefully review system requirements to gather a complete understanding of the project scope so that we can provide the best possible service to our customers.

Our Project Managers are responsible for maintaining project budgets, schedules, and quality from the start of design through final project turnover to the customer.

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As our motto states, TVC's goal is to provide a system that is "On Line, On Time, Within Budget, and Right the First Time." To achieve this we pay particular attention to not only the big picture, but the little details. We thoroughly review all process design documents, from P&IDs to vendor submittals to site installation requirements and with this information we design and engineer our systems to get the job done right.

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The term "systems integration" can mean many different things, depending on the field of expertise. For our purposes, we put all configuration and programming activities in this category, whether associated with communications, sequencing, or graphical user interfaces.

A majority of TVC’s control systems involve integration with intelligent devices that support digital communication, such as plant-floor equipment, skid-based controls, variable speed drives, analytical instruments, etc. We have vast experience with hardware and software-based protocol converters, and continually improve our procedures in defining these interfaces. We also utilize multiple forms of media, from copper (CAT-5, twisted-shielded pair, coaxial) to fiber optic (multi-mode and single-mode, fault-tolerant ring) to wireless. Some of our regularly supported protocols are as follows:

  • Allen-Bradley Ethernet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, DF1
  • Modicon Modbus/TCP, Modbus Plus, Modbus RTU, Remote I/O
  • General Electric TCPIP, SNP, Genius

TVC Systems configures the PLC(s) and I/O modules for the project, using our approved Functional Specification. We then program the PLC(s) using our approved Sequence of Operations. The following are some of our key procedures for controller programming:

  • The PLC code is split into subroutines, per each section of the Sequence of Operations, for easy reference.
  • All rungs, tags and/or addresses, and functions are documented clearly.
  • Proven software routines from our extensive library are used wherever possible. This includes everything from simple auto/manual start/stop circuits, to multiple VFD-driven pumps on a common header with demand-based setpoints and FIFO sequencing.

We program the SCADA and/or plant-floor terminal applications using our approved Sequence of Operations or Operator Interface Specification (if no PLC is provided). Again, we make heavy use of our software library, and the standard "look and feel" of our systems. Our systems often contain the following capabilities:

  • Multiple I/O servers to communicate to separate devices
  • Redundant SCADA nodes
  • Networking to multiple view-only nodes
  • Historian servers
  • Reporting
  • Web access

TVC Systems maintains system integrator programming licenses for the products that we most often use, and our Engineering staff is continuously updated on the manufacturer’s developments.

TVC builds custom control panels in our UL 508A shop. During the project design phase, detailed project drawings are generated, including panel layouts, power distribution, point-to-points and system architecture drawings. Once these drawings are approved, fabrication commences.

Trained and fully qualified technicians perform precise measurements and layout calculations, drill and tap exact mounting holes, and build specialized mounting brackets to turn plain equipment panels into customized user interface equipment adapted to control the buyers delicate process.

All of TVC’s manufacturing practices are environmentally safe and our team of highly trained technicians use only the safest products. All paint is lead free, all hydraulic fluid is biodegradable and recycling both paper and metal is of the utmost importance.

All of our panels undergo a thorough checkout before they are shipped to the customer’s jobsite. We hard-wire all of our systems to simulators so that each and every point, control sequence and alarm can be tested before the system leaves our facility.

Trained and qualified TVC technicians perform start-up functions at the customer site. TVC technicians terminate field wiring internal to TVC’s panels as follows:

  • Two-conductor shielded analog field wires
  • All thermocouple wires
  • All digital signal wires
  • Power circuits
  • All communications cables

Electrical schematics are yellow highlighted during start-up wiring to document that each circuit is terminated.

After the completion of wire terminations, start-up technicians begin start-up tests. This steps them through preliminary checks and power up of the complete system. When all circuits test satisfactorily, the system is released to engineering.

Engineering performs complete system testing with hardware and software. All results are documented. Start-up technicians assist engineering with problems encountered during this final phase of the start-up testing.

Start up personnel complete Customer Service Reports listing all work accomplished and these completed forms are sent to the customer to keep them abreast of the on-site progress.

TVC offers support contracts to all of our customers. Each contract is tailored to meet the specific needs of each client. These contracts can include 24/7 emergency support, regular onsite maintenance, project management and more.

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TVC has extensive experience with field instrumentation. We employ ISA certified and highly trained technicians to support our customer’s calibration needs. We maintain strict calibration procedures and NIST traceable calibration equipment.

TVC works with our customers to implement calibration procedures tailored to meet their individual needs. Typical process instrumentation may include temperature, pressure, flow and level transmitters, valve positioners and limit switches, and VFD drives to name a few.

Online, On Time, Within Budget, and Right the First Time.

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