Elcold UNI Operations Instructions download pdf (Page 10)

User Instructions Low Temperature Freezers Model UNI/LT

OA1 Second relay conﬁguration: ALr: alarm;

LHt: auxiliary; onF: always on;

dEF: do not select it!.; FAn: do not select it!.;

AoP Alarm relay polarity: it set if the alarm

relay is open or closed when an alarm hap-

pens. CL= the relay is closed; oP = the relay

is open

i1P Digital input polarity: oP: the digital input

is activated by opening the contact; CL:

the digital input is activated by closing the

contact.

i1F Digital input conﬁguration:

EAL = external alarm: “EA” message is dis-

played; bAL = serious alarm “CA” message is

displayed. PAL = pressure switch alarm, “CA”

message is displayed; dor = door switch

function; dEF = activation of a defrost cycle;

LHt =switch on the second relay if oA1=LHt;

Htr = kind of action inversion (cooling – heat-

ing).

did: (0÷255 min)

with i1F= EAL or i1F = bAL digital input alarm

delay: delay between the detection of the

external alarm condition and its signalling.

with i1F= dor: door open signalling delay

with i1F = PAL: time for pressure switch func-

tion: time interval to

calculate the number of the pressure switch

activation.

nPS Pressure switch number: (0 ÷15) Number

of activation of the pressure switch, during

the “did” interval, before signalling the

alarm event (I2F= PAL). If the nPS activation

in the did time is reached, switch oﬀ and on

the instrument to restart normal regulation.

• odc Compressor status when open door:

no, Fan = normal; CPr, F_C = Compressor

OFF

OTHER

PbC Type of probe: it allows to set the kind

of probe used by the instrument: PbC = PBC

probe, ntC = NTC probe.

• rEL Software release for internal use.

• Ptb Parameter table code: readable only.

DIGITAL INPUT

The free contact digital input is program-

mable in ﬁve diﬀerent conﬁgurations by the

“i1F” parameter.

DOOR SWITCH INPUT (i1F = dor)

It signals the door status and the corre-

sponding relay output status through the

“odc” parameter:

no, Fan = normal (any change);

CPr, F_C = Compressor OFF;

Since the door is opened, after the delay

time set through parameter “did”, the door

alarm is enabled, the display shows the mes-

sage “dA” and the regulation restarts. 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.

GENERIC ALARM (i1F = EAL)

As soon as the digital input is activated the

unit will wait for “did” time delay before

signalling the “EAL” alarm message. The

outputs status don’t change. The alarm

stops just after the digital input is de-acti-

vated.

SERIOUS ALARM MODE (i1F = bAL)

When the digital input is activated, the unit

will wait for “did” 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.

PRESSURE SWITCH (i1F = PAL)

If during the interval time set by “did” pa-

rameter, the pressure switch has reached

the number of activation of the “nPS” pa-

rameter, the “CA” pressure alarm message

will be displayed. The compressor and the

regulation are stopped. When the digital

input is ON the compressor is always OFF.

If the nPS activation in the did time is re-

ached, switch oﬀ and on the instrument

to restart normal regulation.

SWITCHING SECOND RELAY ON (i1F = LHt)

With oA1= LHt it switches on and oﬀ the

second relay.

START DEFROST (i1F = dFr)

It starts a defrost if there are the right condi-

tions. After the defrost is ﬁnished, the normal

regulation will restart only if the digital input

is disabled otherwise the instrument will wait

until the “MdF” safety time is expired.

INVERSION OF THE KIND OF ACTION: HEAT-

INGCOOLING (i1F = Htr)

This function allows to invert the regulation of

the controller: from cooling to heating and

viceversa.

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Elcold UNI Operations Instructions Page 10

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