WARNING! Connect an external AC power supply (24 V AC) only to control unit
connectors 40 and 41. If you connect it to connector AGND, DGND or SGND,
damage to the power supply or control unit can occur.
9)
Additional information on the control connections
￭
Embedded EIA-485 fieldbus connection
The EIA-485 network uses shielded, twisted-pair cable with a characteristic
impedance of 100…130 ohm for data signaling. The distributed capacitance
between conductors is less than 100 pF per meter (30 pF per foot). Distributed
capacitance between conductors and shield is less than 200 pF per meter (60 pF
per foot). Foil or braided shields are acceptable.
Connect the cable to the EIA-485 terminal on the control board. Obey these wiring
instructions:
• Attach the cable shields together at each drive, but do not connect them to
the drive.
• Connect the cable shields only to the grounding terminal in the automation
controller.
• Connect the signal ground (DGND) conductor to the signal ground reference
terminal in the automation controller. If the automation controller does not
have a signal ground reference terminal, connect the signal ground conductor
to the cable shield through a 100 ohm resistor, preferably near the automation
controller.
Control unit 223
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