Chromalox 1604 User Manual download pdf (Page 27)

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rC Relative Cooling gain.

This parameter is available only when

device is configured with two control

outputs and Pb is different from zero.

Range: from 0.20 to 1.00

Note: When the device is working with

SMART algorithm and P28 is set to On

the RCG value is limited in accordance

with the selected type of cooling media:

- from 0.85 to 1.00 when P8 = AIr

- from 0.80 to 0.90 when P8 = OIL

- from 0.30 to 0.60 when P8 = H2O

OLAP Dead band/Overlap between H/C

outputs.

This parameter is available only when

device is configured with two control

outputs and Pb is different from zero.

Range: from -20 to 50 % of the

proportional band.

A negative OLAP value shows a dead

band while a positive value shows an

overlap.

rL Set point low limit

Range: from initial scale value (P3) to rH.

Note: When P3 has been modified, rL

will be realigned to it

rH Set point high limit

Range:from rL to full scale value (P4)

Note: When P4 has been modified, rH

will be realigned to it

Grd1 Ramp applied to an increasing set

point change

Range: from 1 to 100 digits per minute.

Above this value the display shows “Inf”

meaning that the transfer will be done as

a step change.

Grd2 Ramp applied to a decreasing set

point changes

For other details see Grd1 parameter.

Note:When device is working with SMART

algorithm the Pb value will be limited by

P29, P30 and P31 parameters.

HyS Hysteresis for ON/OFF control action

This parameter is available only when

Pb=0.

Range: from 0.1% to 10.0% of the input

span.

ti Integral time

This parameter is skipped if Pb=0 (ON/

OFF action).

Range: from 00.01 to 20.00 [mm.ss].

Above this value the display blanks and

integral action is excluded

Note: When the device is working with

SMART algorithm, the minimum value of

the integral time will be limited by P32

parameter.

td Derivative time

This parameter is skipped if Pb=0

(ON/OFF action) or P40 = Pi.

Range:From 00.00 to 10.00 mm.ss.

Notes: When device is working with

SMART algorithm the td value will be

equal to a quarter of Ti value.

IP Integral pre-load.

This parameter is skipped if Pb=0

(ON/OFF action).

For one control output, it is programma-

ble from 0 to 100 % of the output span.

For two control outputs it is programma-

ble from -100% (100 % cooling)

to 100 % (100 % heating).

Cy1 Output 1 cycle time

Range:From 1 to 200 s.

Cy2 Output 2 cycle time

This parameter is available only if P 7 is

equal to 4.

Range:From 1 to 200 s.

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