Carel Clima User Manual download pdf (Page 16)

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clima +030220641 - rel. 1.3 - 18.04.2013

Average of the temperature readings between the

built-in sensor and the remote sensor

This operating mode is only possible if is the remote sensor is installed,

otherwise the instrument shows a remote sensor error and only uses the

built-in sensor for control.

The average value is both used for control and shown on the display.

This temperature control mode is based not only on the reading of the

built-in sensor (TI), but also the outside temperature sensor (TE). It is in

essence a weighted average of the two temperature measurements

according to the above mentioned formula:

Tm = (TI * (100-nEd) + TE *nEd)/100 Def.=0 (built-in sensor

only)

code description of the parameter range def. UOM

nEd

Parameter for control with average value sensor values

De nes the average control temperature (Tm), based on the weighted average of the inside temperature (TI) and

outside temperature (TE).Both the measurements must be valid and Tm is achieved with the following formula:

Tm = (TI * (100- nEd) + TE * nEd) /100

Def=0 internal probe only

0 to 100 0.0 %

Tab. 4.h

RS485 serial communication protocol

The controller features serial communication to the supervisor using

CAREL protocol V3.0 and higher and the Modbus® RTU protocol. To

connect to the supervisor over RS485, option IROPZ48500 is required.

The transmission speed and communication protocol settings are shown

in the table:

code description of the parameter range def. UOM

SEr

Select serial communication protocol

0: CAREL protocol 9.6 kb/s 3: Modbus® 19.2 kb/s, even parity, 8 bits, 1 stop

1: CAREL protocol 19.2 kb/s 4: Modbus® 9.6 kb/s, no parity, 8 bits, 2 stop

2: Modbus® 9.6 kb/s, even parity, 8 bits, 1 stop 5: Modbus® 19.2 kb/s, no parity, 8 bits, 2 stop

0 to 5 1 -

Tab. 4.i

Temperature set point compensation based on the

outside temperature

For control that considers the outside temperature, the outside

temperature sensor can be connected to compensate the temperature

set point. Such compensation, once activated, is the same for all control

modes, day, night, cooling and heating.

Parameters Cts and Ctt de ne the di erence between the set point

and the outside temperature above which compensation is activated.

Parameter CSt de nes the compensation factor and CdF the maximum

set point compensation allowed.

Cooling control:

SP comp. = setpoint + (Text – set point – CtS) * CSt

Heating control: SP comp. = setpoint – (set point – Text – Ctt) * CSt

The maximum correction value is limited by parameter CdF, that is, if the

compensation calculated is higher (cooling) or lower (heating) than CdF,

the controller uses ± CdF as the maximum compensation value.

The weight of the correction is de ned by CSt, set in tenths of °C from

-1 to +1.

comp. SP

CdF

CSt positive control

CSt negative control

CdF

Ctt

CtS

heating set pointcooling set point

external

temperature

Fig. 4.j

code description of the parameter range def. UOM

CSt

Parameter CSt enables and sets the gain for set point compensation according to the outside temperature. If CSt

= 0 compensation is disabled. Also see parameters Ctt and CtS.

-1 to 1 0.0 °C

CdF

The maximum value for the compensated set point is limited by this parameter. In heating mode, if the di erence

calculated for set point compensation is higher than CdF, the instrument uses CdF as the maximum di erence

from the set point.Similarly, in cooling mode if the di erence calculated for set point compensation is less than

CdF, the instrument uses CdF as the maximum di erence from the set point.

0 to 20 2.0 °C

Ctt

Temperature set point compensation in heating based on the outside temperature measurement: compensated

set point = set point – (set point – Text – Ctt) * CSt

Compensation is activated only if: Text < set point – Ctt

0 to 25 10.0 °C

CtS

Temperature set point compensation in cooling based on the outside temperature measurement:compensated

set point = set point + (Text – set point – CtS) * CSt

Compensation is activated only if: Text > set point + CtS

0 to 25 10.0 °C

Tab. 4.j

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 39 40

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Carel Clima User Manual Page 16

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