Layout - 3P Technik TC320 Installation And Operating Manual

Cable Glands (qty depending on model)
1 x Pressure transmitter with 20m cable
Optional - 2 Pressure transmitter with 20m cable
nd

Layout

Unlike a pressure based controller, the 3P TC Series Tank Controller does not contain any plumbing. This
means you can install the control panel anywhere you wish within the building.
You will need to consider the following constraints,
The control panel cannot be mounted outside, it is not weather resistant (although can be made weather
resistant – call us for advice)
Voltage drop will affect the cable size needed to take power to your pumps. Over very long runs, you may
find it more economical to install contactors near to the pumps, allowing you to control the pumps with a
sensible cable size. It is strongly recommended that you calculate voltage drop for cable runs in excess of
20m. Failure to do so may result in faulty operation, cable overheating, conductor migration, and risk of
fire. The same caution applies to solenoid valves, although the current draw is usually so small that only
extreme distances are likely to present a problem.
Also note that all control cabling (sensor and switch wiring) beyond a few metres and installed in
electrically noisy environments may need to be shielded to avoid false switch detection or unstable level
readings.
Note – it is recommended that you earth the shielding on cables (where present) to an earth terminal
within the controller. Do not earth to DC 0v as the DC power supply is isolated and will not function as a
ground.
Do not install control cabling next to mains power cables, particularly over long distances. Adequate
separation from power cables will reduce potential problems. Where control cabling must cross mains
wiring it should be done at right angles and kept to a minimum.
We do not make any recommendation as to the specific cable or layout to be used. It is the responsibility of
the installer to install control cabling appropriately giving consideration to length and proximity to
electromagnetic noise.
It is expected that the installer is suitably competent with regard to electrical installation, and the
provisions of and testing in accordance with the current regulations in force in your area. It is also expected
that the installer is competent to install, validate and resolve any issues with regard to control cabling.
In the event of unresolved interference to switch inputs, it is possible to create a separate powered sensor
circuit at low voltage operating relays near to the control panel to act as inputs. This will have much higher
immunity to parasitic voltages than the transistor based inputs on the control panel.
Most instability of the level sensor caused either by interference or turbulence in the water itself can be
compensated in software by adjustment of the probe stability setting.
Pressure transmitter cable is of a special type incorporating a vent tube to equalise the pressure within the
transmitter to atmospheric pressure (3P part no. IRVENT or IRVENTX depending on type). The vent should
TC Series Controller v1.30
www.3ptechik.co.uk 09-August-2017 Page 4 of 28