Eliwell EW971 User Manual

ALARMS
Label Fault Cause Eects Remedy
E1
Probe1 faulty
(cold room)
• reading of out of range operating
values
• probe faulty / short-circuited / open
• Display label E1
• Alarm icon permanently ON
• Min/max alarm regulator disabled
• Compressor operation according to “Ont”
and “OFt” parameters.
• check probe type (NTC)
• check the probe wiring
• replace probe
E2
Probe2 faulty
(defrost)
• reading of out of range operating
values
• probe faulty / short-circuited / open
• Display label E2
• Alarm icon permanently ON
• The defrost cycle will end due to Time out
(Parameter “dEt”)
• check probe type (NTC)
• check the probe wiring
• replace probe
AH1
Probe1 HIGH
Temperature
alarm
• value read by Pb1 > HAL after time
of “tAO”.
(see “MIN/MAX ALARMS table)
• Registration AH1 label in the AL folder
• No eect on regulation
• Wait until temperature value read
by probe1 returns below HAL.
AL1
Probe1 LOW
Temperature
alarm
• value read by Pb1 < LAL after time
of “tAO”.
(see “MIN/MAX ALARMS table)
• Registration AL1 label in the AL folder
• No eect on regulation
• Wait until temperature value read
by probe1 to come back obove LAL
EA External alarm
• Digital input activated
(H11 set as external alarm)
• Registration EA label in the AL folder
• Alarm icon permanently ON
• Regulation blocked if EAL = y
• check and remove the external
cause which generate alarm on D.I.
OPd Door Open alarm
• Digital input activated
(H11 set as door switch)
(for a longer time than tdO)
• Registration Opd label in the AL folder
• Alarm icon permanently ON
• Regulator blocked
• close the door
• delay function dened by OAO
Ad2
Defrosting
for time-out
• end of defrosting because of time
instead of because of reaching the
defrost end temperature detected by
the Pb2 probe.
• Registration Ad2 label in the AL folder
• Alarm icon permanently ON
• wait until the next defrost for
automatic return

Eliwell EW971 Specifications

General

Brand	Eliwell
Model	EW971
Category	Controller
Language	English