55
ENG
mpxone +0300086EN rel. 2.2 - 13.11.2023
Functions
Ref. Par Description
comp cnf minimum compressor frequency
comp ddf compressor frequency during dripping
comp cdf frequency during defrost
dripping dd dripping duration
post-dripping Fd post-dripping duration
evap F3 evap fan status during defrost
evap Fpd evap fan status during post-dripping
pump down dH1 pump down duration
5.3.3 Advanced parameters
Maximum interval between consecutive defrosts (par. dI)
Code Description Def Min Max UOM User User terminal
dI Maximum interval between consecutive defrosts 8 0 240 hours S YES
Parameter dI is a safety parameter used to perform cyclical defrosts every “dI” hours. It is also useful if the LAN or RS485 serial
network is disconnected. At the start of each defrost, irrespective of the duration, an interval starts being counted. If this interval
exceeds dI without a defrost being performed, one is started automatically. The count is always active even if the controller is
OFF. If set on the main controller, the parameter affects the entire connected LAN subnet, while if set on a secondary controller,
it only has an effect locally.
Example
If the defrosts are controlled by a centralised system and there is no communication, the request will not be received, so after
the safety time a defrost is started automatically.
300086_058_R01
t
td1
DEF
ON
OFF
td2
td3
dl
Ref. Description
dI Maximum interval between consecutive defrosts
td1…td3 Scheduled defrosts
t time
DEF Defrost
Fig. 5.t
Staggered defrosts
This function is used to perform a series of daily defrosts by setting just the first using parameter td1 and then indicating the
number of defrosts per day using parameter d1S. The controller automatically schedules all the defrosts to be performed at
regular intervals over the 24 hours following the event defined by td1. The same applies to td2 and dS2.
Code Description Def Min Max UOM User User terminal
d1S Number of daily defrosts (td1)
0 Disabled 5 4 hours and 48
minutes
10 2 hours and 24
minutes
1 24 hours and 0
minutes
6 4 hours and 0
minutes
11 2 hours and 11
minutes
2 12 hours and 0
minutes
7 3 hours and 26
minutes
12 2 hours and 0
minutes
3 8 hours and 0
minutes
8 3 hours and 0
minutes
13 1 hour and 0
minutes
4 6 hours and 0
minutes
9 2 hours and 40
minutes
14 30 minutes
0 0 14 - S NO
d2S Number of daily defrosts (td2) - see d1S 0 0 14 - S NO
Remember that the sub-parameter “d_” of td1 (td2) defines the defrost day, as follows:
d_ = Defrost - day
0 = event disabled 9 = from Monday to Saturday
1 to 7 = Monday to Sunday 10 = Saturday & Sunday
8 = Monday to Friday 11 = every day
Notice:
• if event td1 includes a series of days, the programming always ends at 24.00 on the last day. If event td1 includes one day only,
the programming ends at 24.00 on the same day;
• if both td1 and td2 are set, when the defrost events overlap, only the sequence of defrosts that start first are performed..
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