Emerson Universal-R Manuel d'utilisateur télécharger pdf (Page 7)

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General Information

Safety

Ensure that the controllers are installed in such a way so as to comply with all relevant regulations and with

the manufacturer’s instructions. Consult manufacturer’s manual before carrying out any installation or

maintenance procedure. Caution: Electrical shock can kill. Good Practice should at all times be observed.

Sensor interference and extension of probe cables

It is important to avoid running probe cables close to power cables or other electrical equipment and cables

that carry or switch heavy loads. This is even more important when extending probe cables. When

extending probe cables use cable Part No.s CON490 (100 metre roll ) & CON491 ( 25 metre roll ) If

extending beyond the normal maximum of 50 metres, please consult our technical dept.

Sensor resistances at degrees C

-30c -20c -10c 0c +10c +20c

PTC Ohms 617 677 740 807 877 951

NTC Ohms x 1000 115 70 42 27 18 12

Power supply interruption

Dixell controllers store parameter settings in Non Volatile memory, so they will maintain those settings

indefinitely even when disconnected from the power supply.

Models with Real Time Clocks (RTC) will maintain the correct day / time settings for approximately 7

hours (display will be off). If RTC setting is lost, once the power is restored, the controller will revert to it’s

defrost interval timer (see parameter IdF) and the display will alarm “rtC” to warn that the correct

day / time setting has been lost. Re-enter the correct RTC settings to restore Real Time Clock defrosts. The

start time for each defrost is stored in non volatile memory, so these will not have been lost.

Output relays

Always refer to the manufacturer’s manual and ensure that the currents being switched by the controller’s

output relays do not exceed the rating of that relay. If necessary fit an auxiliary relay or contactor of an

appropriate rating.

Output interference

If the control is connected to an inductive coil (e.g. solenoid valves, etc. ) it is possible to pick up and

transmit interference back to the control thus causing errors. If this could be a problem, fit an induction

noise filter model FT-IL ( Part No DIXL930 ). See page 33 for further details.

Electrical noise and Power spikes

If electrical noise is present, fit a line filter FT-PW ( Part No. DIXL932 ). If power spikes are likely to

occur, fit a Varsities Part no. CON210. See page 33 for further details.

Water / Moisture, Ventilation and Vibration

Ensure the controller is protected from excessive moisture and humidity. Air must be allowed to circulate

through the cooling vents at the rear of the controller’s housing. Panel mounted controllers have a frontal

protection rating of IP65. If there is any risk of water getting behind the front mounting then this must be

prevented by the use of a suitable gasket ( PELE 206). Do not fit a controller in a place where it will be

subjected to excessive vibration.

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Emerson Universal-R Manuel d'utilisateur Page 7