CIAT XtraConnect 2 - 6.3 Load shedding control; 6.4 Water flow switch

EN - 27
6.3 Load shedding control
The load shedding controls on the motherboard shut off circuits 1 and 2.
The load shedding input on expansion board 1 of module 2 disables the operation of circuit 3.
The circuit to be shut off will be selected:
- Either by means of runtime balancing, i.e. the controller will turn off the stages that have been running the longest (P175 = automatic).
- Or selectively (P175 = Selective). For example: Input 1/Circuit 1, Input 2/Circuit 2 and Input 3/Circuit 3.
This is an NO contact.
The stages can also be load-shed over the Modbus network, either by shutting them down (bits 515, 517 and 519), or by lowering them to
minimum capacity (P516, P518 and P520). For more information, see the communication protocol section at the end of this document.
- If P175 = Selective, the circuit(s) are load-shed (via information from the bus or the on/off input).
- If P175 = Automatic, the circuits will be shut off by the greatest number of inputs between the on/off inputs and the Bus.
Load shedding is cancelled if no information is sent by the bus for more than 6 hours.
6.4 Water flow switch
This on/off input detects a low water flow through the evaporator of the machine that is operating (automatic machine control input closed).
 Operation in cooling mode:
- This input must be read 10 second after pump 1 is started (or pump 2 if P24 = Yes and P25 = 2. Case of CIAT hydraulic module with two
pumps).
- If the contact is open for more than 3 seconds.
► If ≤ 3 shutdowns occur in 1 hour
● If a fault occurs:
- Pumps turned off.
- Compressors turned off.
- 3-minute time delay
- Fault stored in fault memory.
- Machine and circuit fault output off.
- Water flow fault relay on optional board in Off position.
- General fault led on console flashes.
- Number of faults over a 1-hour period managed.
Display:
► If > 3 shutdowns occur in 1 hour
● If a fault occurs:
- Pumps turned off.
- Compressors turned off.
- Fault stored in fault memory.
- Machine and circuit fault output on.
- Water flow fault relay on optional board in On position.
- General fault LED on console lit steadily.
- Number of faults over a 1-hour period managed.
Display:
● Resetting:
- If the number of faults in 1 hour ≤ 3, the fault is automatically acknowledged at the end of the 3-minute time delay.
- If the number of faults in 1 hour > 3, press RESET on the console to acknowledge the fault.
 Operation in heating mode:
- This input must be read 10 seconds after pump 2 is started.
● If a fault occurs:
- Compressors turned off.
- Fault stored in fault memory.
- Machine and circuit fault output on.
- Water flow fault relay on optional board in On position.
- General fault LED on console lit steadily.
Display:
● Resetting:
- The fault is automatically acknowledged when the input closes
Important: the pumps are protected in cooling mode only, the only case where pumps are supplied by CIAT (POWERCIAT currently)
CIRCUIT X STOP
LOAD SHEDDING
WATER FLOW FAULT
X STOP IN 1H
UNIT STOP
WATER FLOW FAULT
UNIT STOP
WATER FLOW FAULT