Resource Data Management PR0018-PHI Guide de l'utilisateur télécharger pdf (Page 15)

Revision 7.1b Page 15 of 31

Mercury Coldroom Panel Installation Guide

www.resourcedm.com

Warning

Please Note

The specifications of the product detailed on this

Set-Up Guide may change without notice. RDM

Ltd. shall not be liable for errors or for incidental

or consequential damages, directly and indirectly,

in connection with the furnishing, performance or

misuse of this product or document.

Ensure that all power is

switched off before

installing or maintaining

this product

Parameters Description

Number

Parameter

Description

P-01

Cut-in Temp

Temperature at which the LLV or compressor will switch on

P-02

Diff

Differential temperature below the cut-in temperature. The LLV or lead compressor

switches off when below this temperature

P-03

Control Weight

Percentage of the Air-On temperature that is used to calculate the control temp. The

remaining percentage will be used on the Air-Off temperature

Example, P-03 set to 30%

Control temp = 30% Air-on + 70% Air-off

P-04

Display Weight

As above only applied to the display temperature

P-08

Superheat Ref

The EEV controller will attempt to maintain this superheat value

P-09

Response On

Allows the user to speed up the EEV on time. With 30 providing the quickest response and

1 providing the slowest response.

P-10

Response Off

Allows the user to speed up the EEV off time. With 30 providing the quickest response and

1 providing the slowest response.

P-11

Control Type

Allows the user to select either EEV control, EET control or EEV/EET control. Note the

Evaporator Temperature probe should be fitted to the coldest point in the evaporator.

EEV uses the superheat as its main reference with the cabinet temperature as a secondary

control.

EET use the cabinet temperature as its main reference.

EEV/EET uses cabinet temperature as the main control until the SH gets close to the SH

reference point, then it switches to EEV control, it switches back to EET control when the

SH reference is satisfied.

P-17

Evap select

Local – Uses local probes

Rem1 – Uses section 1 pressure from plant pack selected OR If no plant pack can use

Mercury Switch pressure

Rem2 - Uses section 2 pressure from plant pack selected

Rem3 - Uses section 3 pressure from plant pack selected

See: EEV Control using Pressure

P-51

EEV Min Opening

Sets the minimum valve opening level, during normal operation the valve will not go below

this level. (Default 10%)

IF used in conjunction with a Mercury Pressure Hub PR0018-PHI, remote pressure from

Plant Pack or local pressure from a daughter card, then the Minimum value should be set

at 0%

P-52

Superheat Problem

Sets the point at which the algorithm will go to the “EEV Problem” state due to the

superheat temperature. For example if this parameter is set to 0 Degrees and the

Superheat value falls to 0 degrees or below, for the duration of P-54, then the controller will

enter the superheat problem state.

P-53

EEV Problem Opening

Sets the valve open position when entering the “Superheat EEV Problem” state.

P-54

EEV Problem Time

Sets the time the algorithm stays in the “Superheat EEV Problem” state.

P-56

EEV Start Opening

Sets the valve opening % which is used after a defrost or when the controller exits a

problem state for, example Superheat EEV Problem state

P-55

Ave Valve Opening

Normally the valve during recovery will open to the last average position. This setting

allows for that value to be reduced by said percentage. For example if the average valve

opening is calculated as 80% and P-55 is set to 50% then the valve will open at 40%.

P-57

Div Value

This parameter only takes effect when the controller is used in conjunction with a Mercury

Switch pressure application. When the Mercury Switch generates the MOP alarm the

controller reduces the maximum valve opening to this percentage. For example if this

parameter is set to 50% and the MOP alarm is generated then the maximum valve opening

will be limited to 50%. Therefore as the controller pulses the valve the maximum the valve

will open is 50%.

Note P-51 EEV Minimum opening overrides the valve output operation and the valve will

not pulse below this setting.

Please see MOP note.

Please note parameters P-51 through to P-57 should not be altered without first

understanding the effects they may have on the case operation. If incorrectly set they may

have undesired affects.

P-85

Key switch mode

Not used on the coldroom panel.

P-87

Control Probe type

Switches between using the air-on probe or the logging probe. Note the control and display

temperature will still be a derivative of the weighted

Average of the control probe + Air-off probe

P-90

Resistor Case Off

Turns on/off the switched resistor case off function

P-92

Fans temperature mode

Allows the user to set the fans to turn off when: -

 A pre-determined temperature is reached (P93)

 When an over-temperature alarm is present

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 30 31

Commentaires sur ces manuels

Pas de commentaire

Resource Data Management PR0018-PHI Guide de l'utilisateur Page 15

Commentaires sur ces manuels