61
ENG
mpxone +0300086EN rel. 2.2 - 13.11.2023
Functions
Code Description Def Min Max UOM User User terminal
dd Dripping time after defrost (fans off) 0 = no dripping 2 0 15 min S NO
F2 Evaporator fans with compressor off 0 = see F0, 1 = always off 101- SYES
F3 Evaporator fan status during defrost 0 = see F0, 1 = off 101- SF3
Fd Post-dripping time after defrost (fans off with control active) 2 0 15 min S NO
Fpd Evaporator fans during post-dripping 0 = on, 1 = off 001- 0NO
Variable-speed fans (EC fans)
MPXone can control variable-speed fans, providing a 0-10 Vdc proportional signal on output Y1 or Y2. In this case, the fans need
to be powered by the mains, while the control signal may come via output Y1 or Y2, set as 0-10 Vdc.
Notice: this function is only available on models with analogue outputs (Y1, Y2)
The maximum and minimum fan speed can be set using advanced parameters F6 and F7.
If using the fan speed controller, F5 represents the temperature below which the fans are activated. There is a fixed hysteresis of
1°C for deactivation.
Code Description Def Min Max UOM User User terminal
F5 Evaporator fan cut-off temperature (hysteresis 1°C) 50 F1 50 °C/°F S NO
300086_056_R01
S
a
-S
b
t
t
F0 = 1
F5+1
F5
F1
F1-Frd
F6
FAN
F7
0%
300086_073_R01
S
a
t
t
F0 = 2
F5+1
F5
F1
F1-Frd
F6
FAN
F7
0%
Fig. 5.z Fig. 5.aa
Ref. Description
Sa Probe set by parameter FSa
Sb Probe set by parameter FSb
F5 Fan cut-off temperature
F1 Fan activation threshold
Ref. Description
Frd Differential
t time
FAN Evaporator fans
The advanced parameters for the evaporator fans concern the minimum and maximum speed and the peak time.
Code Description Def Min Max UOM User User terminal
F6 Max evaporator fan speed 100 F7 100 % M NO
F7 Min evaporator fan speed 0 0 F6 % M NO
F8 Evaporator fan peak time
0 = Function disabled
0 0 240 s M NO
F10 Evaporator fan time forced at max speed
0 = Function disabled
0 0 240 min M NO
F6: is the maximum fan speed, expressed as a % of the output. For 0 to 10 V outputs, it represents the output voltage at maximum
speed as a percentage. The same is true for the minimum speed set for F7.
The fan peak time F8 represents the operating time at maximum speed set using parameter F6 to overcome the mechanical
inertia of the motor.
F10 represents the frequency at which the fan is operated at maximum speed for the peak time (F8). If the fan operates too long
at low speed, ice may form on the blades; to avoid this, at intervals of every F10 minutes, the fan is switched on at maximum
speed for the time set for parameter F8.
300086_070_R01
F5+1
F5
F1
T
FAN
SPEED
0%
F7
F6
F1-Frd
Ref. Description
T temperature
F1 Fan activation threshold
Frd Differential
F5 Fan cut-off temperature
F6 Maximum speed
F7 Minimum speed
Fig. 5.ab
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