Specific Alarms With Multiple Units; About The Alarms; To Enter The Alarm Screen - Daikin LMS Serie Betriebsanleitung

A Start
A1 Start not synchronised
B End synchronised
B1 End not synchronised
C1 Controller secondary unit 1
C2 Controller secondary unit 2
C3 Controller secondary unit 3
C4 Controller secondary unit 4
CM Primary unit controller
dS1~4 Defrost synchronisation parameters
d2 Network end defrost synchronised for primary unit
Local defrosting on a LMSEY unit is still possible in two ways:
▪ Manually (from app, supervisory system or user interface).
▪ With parameter "dI" (maximum interval between consecutive
defrosts) taking control. This will happen when a network
connection fault occurs that lasts longer than the "dI" parameter
setting. Therefore the "dI" parameter must always be set.
4.4.2

Specific alarms with multiple units

INFORMATION
When several units work together in one cold room, an
alarm on one of those units will only affect the operation of
that one unit.
Sv probe error (air off)
The controller regulates through the evaporator inlet temperature
probe with an adjustable offset from the setpoint (parameter r8). If
this parameter is set to 0 or if the evaporator inlet temperature probe
is broken, the controller will follow the duty setting operation (c4).
EEV temperature probe broken (TH5 / TH6)
If these temperature probes are broken, the corresponding valve will
be kept at a fixed position (new parameter cP3) and the compressor
can continue running. If the compressor stops, the valve will follow
the standard regulation.
LOP, Low SH alarms, Low suction temperature alarm
If any of these alarms are triggered by the expansion valve
controller, the whole unit will be stopped. These alarms reset
automatically.
MOP alarm
A MOP alarm can be an alarm or warning based on the PM5
parameter.
Dirty condenser alarm:
There is only one dirty condenser alarm per each unit present, this
alarm is triggered by the highest value of the 2 probes.
Discharge temperature alarm
If the discharge temperature probe is configured, the controller will
generate an alarm in case of too high a discharge temperature. In
this case, all compressors in the unit will be switched off. This alarm
resets automatically. Parameter cHI is the high discharge threshold
and parameter cHd is the differential.
Immediate external alarm delay
This digital input is used to manage HPS and LPS, the immediate
external alarm (IA) will be reset after the IA7 minute. This alarm can
be reset before IA7 time by resetting all alarms (rSA = 1).
There are 2 cases of network errors:
▪ Expansion valve controller offline.
▪ Primary/Secondary unit controller offline.
LMSEY1A09/13 + LMSEY2A19/25
Daikin LMS
4P728169-1B – 2023.07
Expansion valve controller offline (EdcB)
It is possible to preset which action the expansion valve controller
will perform in case of an offline alarm. The reference is the
parameter EDI (look at the chapter "EEV parameters" of the RS). In
all cases, only when the "EdcB" alarm is triggered a CU controller
will power off all compressors.
A new parameter "dEd" is added to insert a delay between the offline
event and the "EdcB" alarm. The "EdcB" alarm will be triggered only
if the offline condition lasts for the entire "dEd" time, if the offline
condition disappears before the "dEd" time, the alarm will not be
displayed and the "dEd" time will be reset.
Primary/Secondary unit controller offline
In case the secondary unit controller is offline, the primary unit
controller will keep all functions working without taking care of the
specific secondary unit controller that is no longer available (network
regulation, network defrost, door,...).
From the secondary unit controller side, the controller will try to
guarantee the cooling, so it will regulate on the Sv probe or
evaporator temperature if no Sv is present.
4.5

About the alarms

4.5.1

To enter the alarm screen

1 Unlock the user interface. See "4.2.1 To unlock the user
interface" [ 4 7].
2 Press the PROGRAM button to enter "dir" mode.
Result: The display shows "dir".
3 Use the UP (a) and DOWN (b) buttons to navigate towards the
desired menu, then use the PROGRAM (c) button to enter the
menu "ALM" (alarm).
INFORMATION
If no button is pressed, the terminal will return to the
standard display after 7 seconds.
4 User interface
a b
c
Operation manual
13