Integrazione di Chiller HVAC CANopen: Carrier, York, Daikin tramite Gateway Ixxat

Gateway Ixxat CANopen — passaggi di configurazione tramite interfaccia Web

1. Hardware connections
   CAN port: Connect CAN_H, CAN_L, GND to chiller CAN terminals
   ETH port: Connect to building LAN or dedicated HVAC network
   Power: 24V DC supply

2. Web UI access
   Default IP: 192.168.0.100 — change to site VLAN address
   Navigate to: CAN → Bit Rate → Set to 250 kbit/s (match chiller)

3. Import chiller EDS file
   CANopen → Devices → Add Device → Upload EDS file
   Assign Node ID matching chiller panel setting (e.g. Node 3)
   The gateway auto-discovers objects from the EDS

4. PDO configuration
   Select TPDO1 of chiller node
   Verify mapped objects include 0x6010:01 (supply temp) and 0x6010:02 (return temp)
   Set transmission type: 255 (event-driven) with event timer 1000ms
   Set inhibit time: 500ms (no more than 2 frames per second per chiller)

5. Modbus TCP register mapping
   Modbus → Register Map → Auto-generate from CANopen objects
   Or manually: map object 0x6010:01 → Holding register 40001
                map object 0x6010:02 → Holding register 40002
                map object 0x6040:01 → Holding register 40010
                map object 0x6050:01 → Holding registers 40011–40012 (UINT32 = 2 registers)
   Modbus TCP port: 502 (default)
   Unit ID: 1 (default — change if multiple gateways on same IP)

6. NMT: Start Network → all nodes transition to Operational
   Verify green LED on gateway and chiller CANopen board

Cablaggio CAN al chiller — quadro a locale tecnico

Cable specification:
  Belden 9841 (120Ω, 24AWG, single shielded twisted pair)
  OR Lapp UNITRONIC BUS CAN (120Ω, available in 2×2×0.22 for multi-pair runs)

Connection (linear bus — no stars):
  Ixxat gateway → [Carrier 30XA chiller 1] → [Carrier 30XA chiller 2]

  Gateway CAN port:
    Terminal CAN_H → Cable pair A
    Terminal CAN_L → Cable pair B
    Terminal GND   → Cable drain wire (shield connected at gateway end only)
    120Ω termination resistor: fitted at gateway (it is the first node on bus)

  Chiller 1 CANopen board (middle node — no termination):
    CAN_H → Incoming pair A AND outgoing pair A (daisy-chain through)
    CAN_L → Incoming pair B AND outgoing pair B
    GND   → Drain wire (DO NOT connect shield to chiller chassis here — ground loop risk)

  Chiller 2 (last node — terminate here):
    CAN_H and CAN_L: same daisy-chain as chiller 1
    120Ω termination: connect between CAN_H and CAN_L at this node

Maximum stub length from trunk to chiller terminal: 0.3m
Run cable in separate conduit from 400V power and VFD cables
Minimum 200mm separation from power cables

Procedura di messa in servizio PCAN-View

1. Connect PCAN-USB to laptop USB
   Connect CAN_H, CAN_L, GND to temporary spur at first chiller
   DO NOT connect termination from PCAN-USB — bus should already be terminated
   (PCAN-USB has no internal termination by default)

2. PCAN-View: Hardware → Connect → Select PCAN-USB
   Bit rate: 250 kbit/s (match chiller setting)
   Click Connect

3. Observe received frames in Trace window:
   Chiller sending heartbeat: COB-ID 0x703 (node ID 3) every ~1000ms
   Data: 05 = Node in Operational state
         7F = Node in Pre-Operational state — gateway must send NMT start

4. Check Error Frame counter (top-right panel)
   Error frames > 0: check termination, bit rate, cable quality
   0 error frames: bus is clean — proceed with gateway connection

5. SDO read test — verify temperature object:
   Transmit tab → New message:
   COB-ID: 0x603  DLC: 8  Data: 40 10 60 01 00 00 00 00
   Click Send
   Response in Receive window at COB-ID 0x583:
   Data: 4B 10 60 01 XX XX 00 00 (bytes 4–5 = supply water temp × 100)

6. Disconnect PCAN-USB, connect Ixxat gateway in its place