89
C) Water return control for storage (P154 on master machine = Yes):
This type of control makes it possible to generate maximum capacity at a given time, often when electricity is cheapest. Both machines are
turned on at an interstage time delay of 10 seconds when P122 + P155 is achieved. The machines are shut off at P122 at an interstage time
delay of 1 second.
- If P154 = Yes, storage control is enabled and the control mode based on the selected setpoint is controlled by the master machine.
Cascade control is used by default for both machines when setpoint 1 selected (standard control).
The „Yes‟ value of P154 on the slave machine becomes inaccessible if P28 = Yes.
D) Hourly scheduling:
If P27 = Yes, the hourly schedules of two parallel-connected machines will be controlled by the control parameters on the master machine and
the hourly schedule on the slave machine will become inaccessible.
22.1.5 Machine status menu:
If there are no general faults and the automatic operation inputs are closed, a submenu (overrides the fault message) is added to the machine
status menu:
23 ACTUATION OF THE ELECTRONIC EXPANSION VALVEE
23.1 With Alco driver and display
Only fault feedback signals from the valve are managed in this case
23.2 With CIAT driver
This configuration corresponds to using the electronic expansion valve with the CIAT expansion board and on which the Alco EXV miniboard
with the software is connected.
When P42 is set to this value, the control and view parameters for the Alco electronic expansion valve can be accessed.
The compressor on/off signals authorising the expansion valve to move, as well as the low temperature and suction temperature signals, will
be transmitted over a bus link.
23.2.1 Menus if P42 = CIAT:
Main menu:
Electronic expansion
valve configuration menu:
M A S T E R S L A V E C T R L
M A S T E R M A C H I N E
S L A V E M A C H I N E
10- E L E C E X P . V A L V E
P 6 0 1 C I R C U I T 1
V A L V E T Y P E E X 4
P 6 0 2 C I R C U I T 1
S U P E R H E A T S T P 6 ° C
P 6 0 3 C I R C U I T 1
M O P P O I N T Y E S
P 6 0 4 C I R C U I T 1
MOP V A L U E 1 5 ° C
P 6 0 5 O P N G C 1 E X V
S T A R T A I R C O N X X X %
P 6 0 6 O P N G C 1 E X V
S T A R T H E A T P U M P X X X %
P 6 0 7 P 6 0 7 O P E N I N G T I M E
S T A R T - U P C I R C U I T 1 X X S
P 6 0 8 S L O W M O D E
C I R C U I T 1 E X V N O
P 6 1 1 C I R C U I T 2
V A L V E T Y P E EX4
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