Setting Mode Of The Rwf40 Controller - Riello RWF40 Manuel D'entretien

Table des Matières

The correct setting of the RWF40 controller requires thorough knowledge, which can be acquired by carefully reading this manual.

The controller has a facility for the auto-acquisition of the parameters to be controlled "tunE", which automatically determines the process

variables.

THE USER IS ADVISED TO USE THIS FUNCTION after having set the parameters listed below.

Press the

key and proceed to level 1

PGM

Set the setpoint "SP1" (see page 17) using the

The longer the key is held down, the quicker the value changes.

In order to save the value set, press

By pressing

the user returns to the previous menu.

EXIT

Proceed to level 2

Within this level the user can pass from one parameter to the next by pressing

Set the run time of the servomotor "tt" (see page 18) using the

• 24 s for the SQN90 model servomotor;

• 42 s for all other models of servomotor and burner;

Proceed to level 3

Set:

the type of probe

- for PT100 with 3 wires, set the code 0000 (C111 page 32);

- for pressure probe, set code F000 (C111 page 32).

With signals at the 4...20 ma input, assign to:

SCL, the lower limit of the probe range;

SCH, the upper limit of the probe range.

Example.

• With a pressure probe with a 4...20 ma output and a 0...2.5 bar scale assign to:

SCL = 0

SCH = 2,5

• With a pressure probe with a 4...20 ma output and a 0...16 bar scale assign to:

SCL = 0

SCH = 16

N.B.

The controller leaves the factory set to work with the temperature probe.

When using the pressure probe, remember to set:

• the dead band "db", area without commands to the servomotor, Parameters level

• the ignition differential of the burner "HYS1" , Parameters level

• the shut-down differential of the burner "HYS3", Parameters level

Example:

• Pressure probe with 0...2.5 bar scale (low-pressure steam boilers), set:

db = 1% of the setpoint value;

HYS1 = -0,1;

HYS3 = 0,1.

• Pressure probe with 0...16 bar scale (high-pressure steam boilers), set:

db = 1% of the setpoint value;

HYS1 = -0,3;

HYS3 = 0,3.

the upper limit "SPH" and lower limit "SPL" of the setpoint (see page 25) using the keys

At this point, start-up the "tunE" function (see page 38).

Note. For the correct acquisition of the parameters, the "tunE" function must be started with the system cold or when the actual value

(boiler temperature/pressure) is approximately half the set-point value.