Sequential stops (par. dS1, dS2)
Code Description
Def Min Max UOM User
User
terminal
dS1
Compressor off time in sequential stop defrost mode
0 = function disabled
0
0
45 min
M
NO
dS2
Compressor operating time in sequential stop defrost mode
120 0 240 min
M
NO
Sequential stop mode is especially useful for medium temperature refrigeration units, and is based on
the intelligent stopping of control to allow the evaporator to defrost naturally by the flow of ambient air
only, without activating the defrost output. If the function is enabled (parameter dS1>0), two countdowns
are activated during normal control:
l
OFFTIME: counts down during the stop time and on hold during control;
l
ONTIME: counts down during control and on hold during the stop time.
Two events may occur, with reference to the following figure:
1. OFFTIME is reset (instant C): OFFTIME and ONTIME are reset with the values dS1 and dS2 and the
defrost is considered completed. Control resumes;
2. ONTIME is reset (instant A): OFFTIME iis reset with the default value and the natural defrost starts,
lasting the entire time dS1. At the end of the defrost (instant B), OFFTIME and ONTIME are reset with
the values dS1 and dS2 and control resumes.
Fig.5.u
Ref.
Description
CMP
Compressor
t
time
The purpose is to stop control and allow natural defrosts only when necessary.
When control stops in sequential stop mode, the defrost icon will come on, the defrost status will be sent
to the supervisor and the display will reflect the setting of parameter d6.
Note:
the setting of parameter F3 has no effect. Evaporator fan management depends on parameter
F0.
Skip defrost (par. d7, dn)
This function applies to defrosts that end by temperature, otherwise it has no effect. The skip defrost
function evaluates whether the defrost duration is less than a certain threshold dn1 (dn2) and based on
this establishes whether or not the following defrosts will be skipped.
ENG
0300086EN rel. 1.0 – 04.09.2018
5. Functions |
67
Содержание MPXone ACS00CB000010
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