Delta M125HV - Connection

3.6.2 RS-485 Connection
INFORMATION
* Screw torque: 0.59 N•m
(cross-section: 0.5~1.5 mm²)
strip from shielding layer
shielding layer
Insulation Tape
When the RS-485 cable needs to be grounded, please follow the steps below.
1. strip a wire from the shielding layer and properly insulate it
2. crimp the insulated wire to the Y-type lug and fix it in position A
SNYBL1-4
A
The pin definition for the RS-485 terminal block is shown in Table 3-4.
- Pins 1 and 2 provide a 12VDC bus for use with accessories.
(If use of 12VDC bus is necessary, place switch 1 in ON position.)
- Pins 3 and 5 are both connected to the DATA+ input.
- Pins 4 and 6 are both connected to the DATA
- input.
These connections allow easy daisy-chaining of multiple inverters.
A 120ohm bus termination resistor and associated control switch are located on
the communication board (Figure 3-22), refer to
Table 3-5 for the switch function.
Different RS-485 connection scenarios require different set up for the 120ohm
bus termination resistor.
•
When several inverters are cascaded (i.e., "daisy-chained") only the last inverter
in the chain must have its bus termination resistor switched ON.(Figure 3-25)
• If the length of any RS-485 bus is greater than 610m, the use of Belden 3105A
cable (or eq.) is recommended to insure communication quality.
• The length of RS-485 cable is recommended to be less than 30m in general.
Table 3-4: RS-485 Terminal block wiring
- In order to have good transfer quality, twisted-pair wire is recommended to be
used as communication cable.
ATTENTION
Pin Function
1 VCC (+12V)
2 GND (It is not the PE)
3 DATA+
4 DATA-
5 DATA+
6 DATA-
1 2 3 4 5 6
VCCGND D+ D- D+ D-
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Installation