MD600 Series Compact AC Drive Hardware Guide-EN-B06.PDF - 第78页
Wiring ‑77‑ Figure 6‑13 DO connecting to external controller Wiring of Relay Output Terminals The inductive load (relay, contactor, and motor) causes voltage peak after the current is removed. To minimize the interferenc…
Wiring
‑76‑
Figure 6‑12 Wiring between DO and relay
Connect the snubber diode with the polarity placed correctly. Otherwise, the DO circuit
will be damaged upon the DO output.
DO: Optocoupler isolation; unipolarity open collector output
Output voltage range: 0 V to 24 V
Output current range: 0 mA to 50 mA
The DO is a single-polarity terminal and can be wired only in the following way.
The DO does not require the internal 24 V power supply.
Wiring
‑77‑
Figure 6‑13 DO connecting to external controller
Wiring of Relay Output Terminals
The inductive load (relay, contactor, and motor) causes voltage peak after the current is
removed. To minimize the interference at cutoff, connect a voltage dependent resistor to
the relay contact and connect absorption circuits, such as voltage dependent resistors,
RC absorption circuits, and diodes, to other inductive loads, as shown in
"Figure 6–14
Anti-interference treatment for relay output terminals
"
on page 77
.
Figure 6‑14 Anti-interference treatment for relay output terminals
Note
● The power supply connected with the control circuit must use class 2 power
supply; otherwise, the operation performance of the AC drive will be degraded.
● For control cable specifications, see "Control Circuit Cable" in MD600 Series
Compact AC Drive User Guide.
Wiring
‑78‑
6.4 Communication Wiring
6.4.1 RS485 Communication Wiring
Use a three-conductor shielded cable as the RS485 bus to connect to 485+, 485-, and
GND terminals of the AC drive. Use the twisted pair cable to connect to the 485+ and 485-
terminals and use the other cable to connect to the RS485 reference ground terminal
GND. Connect the shield to the equipment ground. In the following figure, the left
termination resistor is set by the DIP switch on the master. If the master does not have a
built-in termination resistor, install an external termination resistor. The right termination
resistor is also set by the DIP switch.
Figure 6‑15 RS485 bus topology
The maximum number of nodes and transmission distance of a standard RS485 circuit
vary with the transmission rate, as listed in the following table.
Table 6–5 Transmission distance and number of nodes
Transmission
distance (m)
Transmission Rate
(kbps)
Number of Nodes Cross-Sectional
Area
100 115.2 128 26 AWG
1000 19.2 128 26 AWG
6.4.2 CAN Wiring
Use the daisy chain mode for the CAN bus, as shown in the following figure. Use shielded
twisted pair cables for the CAN bus, and use twisted pair cables for CANH and CANL
signal cables. In the following figure, the left termination resistor is set by the DIP switch
or an external termination resistor is installed. The right termination resistor is also set by
the DIP switch. Connect the reference grounds for CAN signals of all the nodes (up to 64
nodes) together.