User manual

30
St
rd/2 rd/2
Sonda virtuale
Reverse
R
R
St
r2
Sonda virt
u
Direct + zona neutra
rd/2rd/2rn/2 rn/2
D
R
D
St
rr rn/2 rn/2rn
Temperatura
rd/2rd/2
R
R
R
Reverse + zona neutra
St
rd/2 rd/2
Sonda virtuale
Direct
D
D
Zona neutra
rr St rd/2 rd
Grandezza controllata
Direct
Direct
R
D
D
ENGLISH
ir33 +030220441 - rel. 2.5 - 16.06.10
Fig. 6.g
Fig. 6.h
Fig. 6.i
Fig. 6.l
Fig. 6.f
6.12 Control with second step
Control with a second step can be activated, using the aux1 or aux 2 output, ‘H1 or H5’=12 or 13 (with selection of rotation). The set point
for the second step is equal to the sum of the set point ‘St’ and the parameter ‘rd’/2, which represents the di erential. Control in
reverse mode is possible for the second step in the same way as for the  rst ( parameter r3, digital input), therefore three steps are
possible in reverse (with dead band control).
Below is a diagram of control with the second step in the case of direct operating mode (‘r3’=0 and 1).
Note: the step corresponding to the aux1 or aux 2 output is associated with the timers ‘c0’,‘c1’,‘c2’,‘c3’.
In addition, parameter ‘c11’ is active, setting the activation delay between the  rst and second step so as to distribute the starts over
time; no delay is available when deactivating.
If the curtain switch function is enabled (‘A4’=7), the controller modi es the set point when the contact closes, adding or subtracting
the value of parameter ‘r4’.
The new value is used for all functions relating to the set point (e.g. relative high and low temperature alarms, dead band, etc.). When
‘r4’=3.0 (preset value) the set point is increased by 3 degrees compared to the value used with the curtain open in direct mode, and
decreased by 3 degrees in reverse mode.
Note: the rotation of the loads is available with the second step. Setting ‘H1 or H5’=13 activates the function, according to the
following table:
Step 1 Step 2 Rotation Compressor 1 Compressor 2 Step 1 Step 2 Rotation Compressor 1 Compressor 2
o o 0 o o o o 0 o o
on o 0 on o on o 0 on o
on on 0 on on o on 1 o o
on o 1 o on on o 1 o on
o o 0 o o o o 0 o o
on o 0 on o
o o 1 o o o o 0 o o
on o 1 o on on o 0 on o
on on 1 on on on on 0 on on
on o 0 on o on o 1 o on
o o 1 o o on on 1 on on
on o 1 o on on o 0 on o
on on 0 on on
Tab. 6.m
When ‘H1 or H5’=13, the rotation  ag is reversed whenever the compressor stops, and then on the following start request or the
following deactivation of one of the two loads, the load not involved in the previous activation or deactivation will be used.
Note: if control with 2 compressor steps is selected, all the functions that feature the activation or deactivation of the compressor
will activate or deactivate both steps.
The following table de nes the status of the second step output (aux1) during control.
Function active Second step output
Normal direct or reverse-cycle control Normal operation
Remote o , from supervisor or keypad Output deactivated
Defrost Normal operation
Continuous cycle Normal operation
Temperature alarm monitoring Normal operation
Evaporator fan control Normal operation
Power on Normal operation
Normally-open or normally-closed alarm output Normal operation
Auxiliary output Normal operation
Light output Normal operation
Second evaporator output Normal operation
Control output for pump down valve Normal operation
Condenser fan control output Normal operation
Second delayed compressor output Normal operation
Auxiliary output with switch o Normal operation
Light output with switch o Normal operation
No function associated with the AUX output Normal operation
Reverse output in control with dead band Normal operation
Second compressor step output -
Second compressor step output with rotation -
Door switch with compressor, fan o and light management Output deactivated
Door switch with compressor o and light management Normal operation
Curtain switch with set point variation and light management Normal operation
Light sensor and light management Normal operation
Auxiliary output activation switch Normal operation
Door switch with compressor, fan o , no light management Normal operation
Door switch with compressor o , no light management Normal operation
Light activation from keypad or supervisor Normal operation
Auxiliary activation from keypad or supervisor Normal operation
Alarms See table of alarms and signals
Virtual control probe alarm Output deactivated
Product probe alarm Normal operation
Defrost probe alarm Normal operation
Condenser probe alarm Normal operation
Antifreeze probe alarm Normal operation
Tab. 6.n