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Mode 1: DIRECT function (pict. 5).

The main parameters in this kind of function are Set Point (St1) and differential (P1). In the

Direct function mode the regulator opposes the controlled parameter only if it exceeds the

Set Point value. Having once fixed the desired Set Point (St1), the outputs will be energized

one by one as the parameter deviates from St1. As shown in the picture, the relays in the

models with more outputs are equally distributed within each single set differential.When

the controlled parameter is equal to/higher than St1+P1, all outputs energize.Viceversa, if

the parameter, starting from values higher than St1, starts to decrease, any active relay will

be deactivated as approaching St1.When the St1 value is reached, all outputs will be

disenergized.The DIRECT led will flash periodically, once for each activated output.

Mode 2: REVERSE function mode (pict. 6).

This is the previously described factory-set mode.

Mode 3: Dead-Band function mode (pict. 7).

The main parameters in this kind of function mode are Set Point (St1), Reverse mode

differential (P1), Direct mode differential (P2) and Dead-Band (P3). The aim of the regulator

is to bring the controlled parameter within a limited range, called dead zone, set around the

Set Point (St1). As shown in the picture, the dead zone value depends on the P3 parameter

value.Within the dead zone the instrument does not require the intervention of any device.

Outside the dead zone the instrument will work in DIRECT mode, when the controlled

parameter increases and, in REVERSE mode, when it decreases. According to the used

model, there can be one or more relays in Direct and Reverse function. Said outputs are

activated/deactivated according to the procedures already shown in modes 1 and 2,

according to the values of the controlled parameter, of St1 value, of P1 and of P2.The

DIRECT led and REVERSE led indicators will flash as already described. W

arning: when

the instrument has only one relay output, it will work in REVERSE mode with Dead-Band.

Advanced set-up: Function Modes description

+05-3015 • rel.3.0 interno ok 18-09-2002 14:31 Pagina 45

Carel universal infrared series User Manual

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