Rev 3 Service Manual MCC Hot / Cold 2021
Page 73
EWPlus EO LVD
10/12
DIAGNOSTICS
Alarms are always indicated by the buzzer (if present) and the alarm icon .
To switch off the buzzer, press and release any key; the corresponding icon will continue to flash.
N.B.
: If alarm exclusion times have been set (see “
AL
” folder in the parameters table) the alarm will not be signalled.
ALARMS
Label
Fault
Cause
Effects
Remedy
E1
Probe1 faulty
(cold room)
• measured values are outside operating
range
• Probe faulty/short-circuited/open
• Display label
E1
• Alarm icon permanently on
• Disable max/min alarm controller
• Compressor operation based on parameters
'
Ont
' and '
OFt
'.
• check probe wiring
• replace probe
E2
Probe2 faulty
(defrost)
only on
EWPlus971/974 EO LVD
• measured values are outside operating
range
• Probe faulty/short-circuited/open
• Display label
E2
• Alarm icon permanently on
• The Defrost cycle will end due to Timeout (
dEt
)
• The evaporator fans will work in Duty Cycle
mode.
• check probe wiring
• replace probe
AH1
Alarm for HIGH
Pb1 temperature
value read by Pb1 > HAL after time of
tAO
.
(see “MAX/MIN TEMPERATURE ALARMs")
• Recording of label
AH1
in folder AL
• No effect on regulation
• Wait until value read by Pb1 returns below
HAL-AFd
.
AL1
Alarm for LOW
Pb1 temperature
value read by Pb1 < LAL after time of
tAO
.
(see “MAX/MIN TEMPERATURE ALARMs")
• Recording of label
AL1
in folder AL
• No effect on regulation
• Wait until value read by Pb1 returns above
LAL+AFd
.
EA
External Alarm
digital input activation
(
H11 = ±5
)
• Recording of label
EA
in folder AL
• Alarm icon permanently on
• Regulation locked if
rLO
= y
• check and remove the external cause which
triggered the alarm on the D.I.
OPd
Door open alarm
digital input activation
(
H11 = ±4
)
(for longer than
tdO
)
• Recording of label
Opd
in folder AL
• Alarm icon permanently on
• Controller locked
• close the door
• delay function defined by
OAO
Ad2
end of defrost
cycle due to timeout
end of defrost cycle due to timeout rather
than due to defrost end temperature being
recorded by probe Pb2.
• Recording of label
Ad2
in folder AL
• Alarm icon permanently on
• wait for the next defrost cycle for automatic
return
Ad3
end of defrost
cycle due to timeout
activation of the defrost for temperature
independently
dAt
.
(active if
dCt
= 3)
• Recording of label
Ad3
in folder AL
• Alarm icon permanently on
• wait for the next defrost cycle for automatic
return
HiP
HIGH voltage
alarm
Voltage value read by the analog input is
higher than the
SPH
value.
• Display label
HiP
• Alarm icon permanently on
• Regulation locked depending on
SoU
value.
• wait for the value read by the analog input
returns below
SPH-dFL
LoP
LOW voltage
alarm
Voltage value read by the analog input is
lower than the
SPL
value.
• Display label
LoP
• Alarm icon permanently on
• Regulation locked depending on
SoU
value.
• Wait for the value read by the analog input
returns above
SPL+dFL
nPA
General pressure
switch alarm
Activation of pressure alarm by general
pressure switch.
(
H11 = ±7
)
If the number
N
of pressure switch activations is
N
<
PEn
:
• Recording of folder
nPA
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 the D.I.
(Automatic Reset)
PAL
General pressure
switch alarm
Activation of pressure alarm by general
pressure switch.
(
H11 = ±7
)
If the number
N
of pressure switch activations is
N
=
PEn
:
• Display label
PAL
• Recording of label
PA
in folder AL
• 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)
MAX/MIN TEMPERATURE ALARMs
Relative Temperature
Value to setpoint (Att=1)
Absolute Temperature
Value (Att=0)
SEt + LAL
AFd
SEt + HAL
AFd
SEt + LAL + AFd
SEt + HAL – AFd
SEt
LAL
AFd
HAL
AFd
LAL + AFd
LAL - AFd
Minimum temperature alarm
Temp. ≤
Set + LAL *
Temp. ≤
LAL
(
LAL
with sign)
Maximum temperature alarm
Temp. ≥
Set + HAL **
Temp. ≥
HAL
(
HAL
with sign)
Returning from minimum temperature alarm
Temp. ≥
Set + LAL + AFd
or
≥
Set -
I
LAL
I
+ AFd
(LAL < 0)
Temp. ≥
LAL + AFd
Returning from maximum temperature alarm
Temp. ≤
Set + HAL - AFd
(HAL > 0)
Temp. ≤
HAL - AFd
* if LAL is negative, Set + LAL < Set
** if HAL is negative, Set + HAL < Set
Summary of Contents for Cold MCC
Page 20: ...Page 20 Rev 3 Service Manual MCC Hot Cold 2021 Circuit diagram evaporator tray...
Page 21: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 21 Wiring diagram evaporator tray...
Page 29: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 29 5 1 MCC 90 Drop in Dimensions Self Serve...
Page 39: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 39 6 0 Installation Front door section...
Page 77: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 77 Page intentionally left blank...
Page 103: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 103 Page intentionally left blank...
Page 139: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 139 17 0 Electrical schematics MCC Cold Self Serve...
Page 140: ...Page 140 Rev 3 Service Manual MCC Hot Cold 2021...
Page 141: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 141 17 1 Electrical wiring MCC Cold Self Serve N L...
Page 142: ...Page 142 Rev 3 Service Manual MCC Hot Cold 2021...
Page 143: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 143 17 2 Circuit Diagram MCC Hot Full Serve...
Page 144: ...Page 144 Rev 3 Service Manual MCC Hot Cold 2021 17 3 Electrical wiring MCC Hot Full Serve...
Page 145: ...Rev 3 Service Manual MCC Hot Cold 2021 Page 145...
Page 146: ...Page 146 Rev 3 Service Manual MCC Hot Cold 2021...
