Code
Description
Def Min Max
UOM
User
User
terminal
tS1..8- h Start time band 1 to 8 day: hours
0
0
23
hours
S
NO
tS1..8-n
Start time band 1 to 8 day: minutes
0
0
59
minutes
S
NO
tE1..8-d
End time band 1 to 8 day: day - see (td1...8-d)
0
0
11
day
S
NO
tE1..8- h End time band 1 to 8 day: hours
0
0
23
hours
S
NO
tE1..8-n
End time band 1 to 8 day: minutes
0
0
59
minutes
S
NO
PDM
Manufacturer password
44
0
99
-
M
NO
PDS
Service password
22
0
99
-
M
NO
PDU
User password
-
0
99
-
S
NO
Note:
HACCP: verify that modification of the night-time set point (parameter /4) is permitted by site
HACCP procedures. If required, obtain the required authorisation and record the changes.
Variable
Daytime control
Night-time control
r6 = 0
r6 = 1
Control probe (Sreg)
Virtual probe (Sv)
Virtual probe (Sv)
Intake probe (air on) (Sr)
Set point
St
St+r4
Fig.5.g
During day status:
l
Set point = St
l
light on
l
control on virtual probe Sv
During night status:
l
Set point = St + r4
l
light off
l
control on Sr (if r6=1) or on Sv (if r6=0)
“Weighted control” and “double thermostat” can be used for automatic changeover to night- time
operation without an external signal.
Weighted control
This function compensates for the disadvantages of control based solely on the outlet (air off) probe or the
intake (air on) probe. The control probe becomes the virtual probe:
The weighted average of the outlet and intake probes is used to compensate for the mixing of air from
outside the showcase. Normally the weight of /4 is set to 50% and the value of the virtual probe can be
chosen for both display and temperature recording.
The value of the virtual probe thus becomes the mean value of the outlet (air off) and intake (air on)
probes and the measurement that best corresponds to the temperature of the produce. Another
advantage is automatic adaptation to night-time operation with the curtain closed, without needing an
external signal. When the curtain is open there is immediately an increase in load on the evaporator,
consequently the outlet temperature is lowered so as to keep the average temperature constant.
ENG
0300086EN rel. 1.0 – 04.09.2018
5. Functions |
53
