Eliwell ID 985 E Manual Download Page 4

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GENERAL PRESSURE SWITCH INPUT
CONTROLLER

This controller performs diagnostics on an
associated digital input using a configura-
tion table. It is activated by setting para-
meters H11 and H12 = 9.
If the pressure switch input trips, the com-
pressor loads are immediately deactivated,
the alarm LED lights up to signal tripping
and the label nPA in the alarm folder
appears on the display.
Controlling is performed using 2 parame-
ters PEn and PEI:

nPA is a subfolder of AL (Alarms), and
keeps a record of each time the pressure
switch is activated if the value indicated by
PEn is reached in a period of time that is
less than or equal to PEI, the label nPA is
replaced by PA (pressure alarm).
The alarm conditions only occurs when the
maximum number of alarms is reached
before the time indicated by parameter
PEI expires. As soon as the first alarm
occurs, the time PEI is calculated.
If the number of times the pressure switch
is activated exceeds the number estab-
lished PEn in the period PEI:
- compressor outputs, fans and defrosting
are deactivated
- the label PA is displayed in the subfolder
nPA
- the alarm LEDs and alarm relay if config-
ured are switched on.
NOTE: Once the device is in alarm mode,
it must be switched off and on again or
reset by activating the rAP parameter in
the functions menu. The nPA folders can
be reset using the rPA function in the Fnc
folder.
NOTE: If parameter PEn is set to 0 the
function is excluded and the alarms and
counts are disabled.

CONDENSER FAN CONTROLLER
This controller is associated with probe
Pb3 and features:
- operating set point
- operating differential
- exclusion of fans in defrosting mode
- start-up delay after end of defrosting If a
digital output is set as condenser fans
(H21...H24=10) the output will behave as
shown below:

If probe Pb3 is not present and alarm E3 is
active, the controller will always be on
during the defrost cycle.

Probe 3 can be excluded and the failed
connection with the instrument will not
trigger an error message.
NOTE: During dripping time the output is
OFF.
NOTE: If a digital output is programmed
as condenser fans (H21...H25 =10) parame-
ter SA3 is always an absolute value irre-
spective of the value of parameter Att.

DIAGNOSTICS

The alarm condition is always signalled by
a buzzer (if present) and the alarm icon
LED. The alarms from the faulty thermo-
stat control probe (probe 1), the faulty
evaporator probe (probe 2), and the faulty
display probe (probe 3) appear directly on
the instrument display as E1, E2, and E3
respectively.

An error condition in probe 1 (thermostat
control) causes the following:
• E1 code appears on display
• compressor is activated as indicated by
“Ont” and “Oft” parameters if these are
programmed for duty cycle or:

The error condition for probe 2 (evapora-
tor) causes the following:
• E2 code appears on display
• end of defrost due to time-out.

The error condition for probe 3 (display)
causes the following:
• E3 code appears on display Other alarms
do not appear on the instrument display
but can be seen in the “Machine Status”
menu in the “AL” folder.
The maximum and minimum temperature
alarm is regulated according to the ther-
mostat control probe (probe1) and/or dis-
play probe (probe 3). The temperature
limits are defined by the “HAL” (maximum
alarm), “LAL” (minimum alarm) and PbA
(alarm configuration on probe 1,3 or both)
parameters.

MAXIMUM AND MINIMUM TEMPERA-
TURE ALARM
If an alarm condition occurs and alarm
exclusion times are not in progress (see
alarm exclusion parameters), the alarm
icon lights up permanently and the relay
that is configured as an alarm is activated.

This type of alarm does not affect the reg-
ulating in progress.
Alarms are considered as absolute
(default) values or as values related to the
Set point (the distance from the Set point
itself) and based on the Att parameter.
If the alarms are relative (Att=1), the para-
meter HA1 is set to positive values and
LA1 to negative values.
This alarm condition can be viewed in the
folder “AL” with labels “AH1-AL1”.
ALARM WITH THRESHOLD (PROBE 3)
By setting the PbA=3 parameter an alarm
is associated to probe 3. It refers to a spe-
cific threshold (defined by the SA3 para-
meter). An over-temperature or an under-
temperature alarm is generated and the
icon is turned on. This alarm condition can
be viewed in the “AL” folder with the
labels “AH3-AL3”.
The alarm is handled as a temperature
alarm referring to probe 3: for delays and
backswings, refer to standard alarms
DEFROST ALARM
If the end of defrosting is due to a time-
out (rather then because an end of
defrosting temperature is detected by the
defrosting probe), an alarm is generated
and the icon lights up.
This condition can be viewed in the “AL”
folder with the label “Ad2”.
Automatic back swinging occurs when the
next defrost starts. By pressing any button
during the alarm condition, the signal light
disappears. In order to cancel the alarm
properly, you must wait until the next
defrost.

EXTERNAL ALARM
The device can also control an external
alarm, i.e. from a digital input. If the digital
input is enabled, the alarm control is acti-
vated by programming and remains
enabled until the next time the digital
input is deactivated. When an alarm is set
off, the alarm icon lights up permanently,
a buzzer (if present) and the relay config-
ured as alarm are activated and the com-
pressor, defrost and fan controllers are
deactivated according to the value of the
rLOparameter):

This alarm condition can be displayed in
the “AL” folder using the “EA” label. The
relay can be silenced; even if the alarm
icon starts blinking, the controllers remain
locked until the next time the digital input
is deactivated.
OPEN DOOR ALARM
If a door is open, the Open Door alarm is
signalled in response to a delay defined by
the tdO parameter. The alarm is signalled
by the flashing alarm icon. This alarm con-
dition can be viewed in the “AL” folder
with the label “Opd”.

ID 985/E LX

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DISPLAY

E1
E2
E3

If simultaneous, they will be showed on the display
alternately every 2 seconds

FAULT

Faulty probe 1 (thermostat control)
Faulty probe 2 (1st evaporator)
Faulty probe 3 (display or 2nd evap-
orator)

Table of faulty probes

Ont

0
0
>0
>0

Oft

0
>0
0
>0