Drawell MDF-40V50 Benutzerhandbuch - Seite 12

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8.3 Digital inputs

The free voltage digital input is programmable in different configurations by the "iF" parameter.

Door switch

It signals the door status and the corresponding relay output status through the "dC" parameter: no



=normal (any change); Fn = Fan OFF; CP = Compressor OFF; FC = Compressor and fan OFF.

Since the door is opened, after the delay time set through parameter "di" , the door alarm is enabled,the



display shows the message "dA" and the regulation restarts if rd = y. The alarm stops as soon as the

external digital input is disabled again. With the door open, the high and low temperature alarms are

disabled.

External alarm(iF=EA)

As soon as the digital input is activated the unit will wait for "di" time delay before signalling the "EA"

alarm message. The outputs status don't change. The alarm stops just after the digital input is de-activated.

Serious alarm (iF=bA)

When the digital input is activated, the unit will wait for "di" delay before signalling the "CA" alarm

message. The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-

activated.

Start defrost(iF=dF)

It starts a defrost if there are the right conditions. After the defrost is finished, the normal regulation will restart

only if the digital input is disabled otherwise the instrument will wait until the "dd" safety time is expired.

Inversion of the kind of action: heating-cooling (iF=Hc)

This function allows to invert the regulation of the controller: from cooling to heating and viceversa.

8.4 Alarm signaling

Mess.

"P1"

Room probe failure

"P2"

Evaporator probe failure

"HA"

Maximum temperature alarm

"LA"

Minimum temperature alarm

"EA"

External alarm

"CA"

Serious external alarm

"dA"

Cause

Door Open

Outputs

Compressor output according to "Cy" e "Cn"

Defrost end is timed

Outputs unchanged

All outputs OFF.

Compressor and fans restarts