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ALARMS
Label Fault Cause Effects Remedy
E1
Probe1 faulty
(cold room)
• measured values outside operating
range
• probe faulty / short-circuit / open-circuit
• Label E1 displayed
• Alarm icon permanently on
• Controller disabled max/min alarms
• Compressor operation based on parameters
"Ont" and "OFt".
• check probes wiring
• replace probe
E2
Probe2 faulty
(defrost)
• measured values outside operating
range
• probe faulty / short-circuit / open-circuit
• Label E2 displayed
• Alarm icon permanently on
• Defrost will end due to timeout (dEt)
• The evaporator fans will be: ON if the
compressor is ON and will operate based on
parameter FCO if the compressor is OFF.
• check probes wiring
• replace probe
E3
Probe3 faulty
(evaporator 2)
• measured values outside operating
range
• probe faulty / short-circuit / open-circuit
• Label E3 displayed
• Alarm icon permanently on
• check probes wiring
• replace probe
AH1
Pb1 HIGH
temperature alarm
• value read by probe Pb1 > HAL after
time “tAO”.
(see “MAX/MIN TEMP. ALARMS”)
• Label AH1 recorded in folder AL
• No effect on control
• Wait for temperature value read by Pb1 to
return below HAL.
AL1
Pb 1 LOW
temperature alarm
• value read by probe Pb1 < HAL after
time “tAO”.
(see “MAX/MIN TEMP. ALARMS”)
• Label AL1 recorded in folder AL
• No effect on control
• Wait for temperature value read by Pb1 to
return above LAL.
EA External alarm
• digital input activated
(H11 = ±5)
• Label EA recorded in folder AL
• Alarm icon permanently on
• Regulation blocked if rLO = y
• check and remove external cause of alarm on
D.I.
OPd Door open alarm
• activation of digital input
(H11 = ±4)
(for a time greater than tdO)
• Label Opd recorded in AL folder
• Alarm icon permanently on
• Regulator locked if dOd ≠ 0
• close the door
• delay function defined by OAO
Ad2 Defrost due to timeout
• End of defrost cycle due to timeout
rather than due to defrost end
temperature being read by Pb2.
• Label Ad2 recorded in AL folder
• Alarm icon permanently on
• Wait for the next defrost cycle for automatic
reset.
COH Overheating alarm
Pb3 exceeded the value set by
parameter SA3.
• Label COH displayed
• Alarm icon permanently on
• Regulation locked (Compressor)
• wait for the temperature to return to a value of
SA3 (Setpoint) minus dA3 (differential).
nPA General pressure alarm
Activation of pressure switch alarm by
general pressure switch.
If the number N of pressure switch activations is
N<PEn:
• Folder nPA recorded in folder AL with the
number of pressure switch activations
• Regulation locked (Compressor and Fans)
• check and remove the cause which triggered
the alarm on D.I. (Auto Reset).
PAL General pressure alarm
Activation of pressure switch alarm by
general pressure switch.
If the number N of pressure switch activations is
N=PEn:
• Label PAL displayed
• Label PA recorded in AL folder
• Alarm icon permanently on
• Regulation locked (Compressor and Fans)
• Switch the device off and back on again
• Reset alarms by entering the functions folder
and selecting the rAP function (Manual Reset)
nL
Communication
Missing Alarm
(only EWKPlus 978)
The controller has not received any
Modbus message during StO time since
it has been lighted on or since the last
message (only if StO ≠ 0).
• Label nL displayed
• Alarm icon permanently on
• Check the network connection.
Temperature value
relative to setpoint value (Att=1)
Absolute temperature
value (Att=0)
Minimum temperature alarm Temp. ≤ Set + LAL * Temp. ≤ LAL (LAL with sign)
Maximum temperature alarm Temp. ≥ Set + HAL ** Temp. ≥ HAL (HAL with sign)
Reset from minimum temperature alarm condition
Temp. ≥ Set + LAL + AFd or
≥ Set - ILALI + AFd (LAL < 0)
Temp. ≥ LAL + AFd
Reset from maximum temperature alarm condition Temp. ≤ Set + HAL - AFd (HAL > 0) Temp. ≤ HAL - AFd
* If LAL is negative, Set + LAL < Set
* If HAL is negative, Set + HAL < Set
MAX/MIN TEMPERATURE ALARMS
LAL
AFd
HAL
AFd
LAL + AFd
HAL - AFd
Setpoint - LAL
AFd
Off
Setpoint + HAL
AFd
Setpoint - LAL + AFd
Setpoint + HAL - AFd
Setpoint
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