Technodom EW 961 Manuel D'installation page 40

EN | Pizza Refrigerated Counters | User and Maintenance Manual
Label Fault
Probe1 faulty
E1
(cold room)
Probe2 faulty
E2
(defrost)
Probe1 HIGH
AH1
Temperature alarm
Probe1 LOW
AL1
Temperature alarm
EA External alarm
OPd Door Open alarm
Defrosting
Ad2
for time-out
To manually activate the defrost cycle, hold down the
If the defrost conditions are not satisfied:
- the parameter OdO ≠ 0 (EW961, EW971 and EW974)
- the evaporator probe Pb2 temperature is higher than the defrost end temperature (EW971 and EW974) the display will flash 3 times, to indicate
that the operation will not be carried out.
Alarms are always indicated by the buzzer (if present) and the alarm icon
To switch off the buzzer, press and release any key, the relative icon will continue to flash.
NOTES: If alarm exclusion times have been set (see 'AL' folder in the parameters table) the alarm will not be signalled.
A probe 1 (Pb1) malfunction alarm will appear directly on the display with the
indication E1.
Models EW971 and EW974: A probe 2 (Pb2) malfunction alarm will appear
directly on the display with the indication E2.
The instrument is designed for panel mounting. Make a hole of 29x71 mm, insert the instrument and fix it using the brackets provided. Do not
mount the instrument in humid and/or dirty places; it is suitable for use in ordinary polluted places. Ventilate the place in proximity to the instru-
ment colling slits.
The Copy Card is an accessory connected to the TTL serial port used for quick programming of the device parameters (upload and download a
parameter map to one or more devices of the same type). Upload (label UL) and copy card formatting (label Fr) operations should be performed
40
ALARMS
Cause
• reading of out of range operating
values
• probe faulty / short-circuited / open
• reading of out of range operating
values
• probe faulty / short-circuited / open
• value read by Pb1 > HAL after time
of "tAO". (see "MIN/MAX ALARMS
table)
• value read by Pb1 < LAL after time
of "tAO". (see "MIN/MAX ALARMS
table)
• Digital input activated (H11 set as
external alarm)
• Digital input activated (H11 set as
door switch)
(for a longer time than tdO)
• end of defrosting because of time
instead of because of reaching the
defrost end temperature detected by
the Pb2 probe.
MANUAL DEFROST CYCLE ACTIVATION
key for 5 seconds.
DIAGNOSTICS
DIAGNOSTICS
USING THE COPY CARD
Effects
• Display label E1
• Alarm icon permanently ON
• Min/max alarm regulator disabled
• Compressor operation according
to "Ont"
and "OFt" parameters.
• Display label E2
• Alarm icon permanently ON
• The defrost cycle will end due to
Time out
(Parameter "dEt")
• Registration AH1 label in the AL
folder
• No effect on regulation
• Registration AL1 label in the AL
folder
• No effect on regulation
• Registration EA label in the AL
folder
• Alarm icon permanently ON
• Regulation blocked if EAL = y
• Registration Opd label in the AL
folder
• Alarm icon permanently ON
• Regulator blocked
• Registration Ad2 label in the AL
folder
• Alarm icon permanently ON
.
Remedy
• check probe type (NTC)
• check the probe wiring
• replace probe
• check probe type (NTC)
• check the probe wiring
• replace probe
• Wait until temperature value read
by probe1 returns below HAL.
• Wait until temperature value read
by probe1 to come back obove LAL
• check and remove the external
cause which generate alarm on D.I.
• close the door
• delay function defined by OAO
• wait until the next defrost for
automatic return