21
AB-7487-U
4) Plug the connector into the actuator socket.
Note:
Completely plug the connector into the actuator socket. Incompletely plugged connector might become unplugged due to vibration.
Wires connection of control signal, DI (Cooling/heating switch signal), pulse output
1) Pass the cable of control signal/DI/pulse output through a wiring port on the other side of the port for power supply cable.
2) Use 4- or 6-core cable for connecting the wires of the multiple signal lines.
Precautions for connection
1. RS-485 communication (See Figs. 25 and 26.):
•
Connect the wires of RS-485 communication cable to the connector unplugged from the actuator socket. After
connecting the wires to the connector, plug the connector into the socket.
•
Do not use terminators.
•
Do not connect between the terminals DA and DB.
•
Single-point ground is required for one side of the shielded cable.
•
Connect SG wire for stable communication link.
•
To daisy-chain the communication line, connect the wires of the receiving line to the terminals In DA, In DB, and In SG.
Connect the wires of the sending line to the terminals Out DA, Out DB, and Out SG.
2. Pulse output (See Figs. 27 and 28.):
•
Apply 30 V DC or lower voltage (on '+V' shown in Fig. 27).
•
Do not directly connect the DC power to the pulse output terminal.
•
To use a magnetic counter with a relay coil, refer to Fig. 28 and connect a protection diode to the input of the magnetic
counter.
3. Temperature sensor for pipe surface:
Since the 3-core cable of the temperature sensor for pipe surface has small diameter, the seal connector pre-assembled
with the product is not enough to ensure the NEMA 4X, IEC IP54 protection. Caulk the seal connector or apply the tape to
seal the connector.
4. Insertion-type pipe temperature sensor:
Use the seal connector Part No. 83104098-001 for the cable of the insertion-type pipe temperature sensor
(AWG 18–22 x 3-core or equivalent.)
5. Internal isolation:
Only the pulse output and the RS-485 communication are internally isolated. Isolator therefore is required to connect a
non-isolated device to the control signal input and DI (Cooling/heating switch signal) of the product.
Solid line: Isolated,
Dashed line: Not isolated
Power
Internal circuit
T1 (Supply water temperature)
T2 (Return water temperature)
Pulse output
Display Panel
DI (Cooling/heating switch signal)
RS-485 communication In
Control signal input
RS-485 communication Out
Figure 20. Internal isolation
6. Single transformer with two products (See Fig. 21.):
Connect the lines from the terminal 1 of each product to the transformer with the same polarity. Connect the lines from the
terminal 2 of each product the same way. If the terminals (of the product and the transformer) with different polarities are
connected, the products may get damaged.
