Mechanical and Electrical Installation–EFB
WARNING
Connections should be made only while the drive is
disconnected from the power source .
• Use Belden 9842 or equivalent . Belden 9842 is a dual
twisted, shielded pair cable with a wave impedance of
120 Ω.
• Use one of these twisted shielded pairs for the RS485
link . Use this pair to connect all A (-) terminals together
and all B (+) terminals together .
• Use one of the wires in the other pair for the reference/
common (terminal 31), leaving one wire unused .
• Do not directly ground the RS485 network at any
point . Ground all devices on the network using their
corresponding earthing terminals .
• As always, the grounding wires should not form any
closed loops, and all the devices should be earthed to a
common ground .
• Connect the RS485 link in a daisy-chained bus, without
dropout lines .
• To reduce noise on the network, terminate the RS485
network using 120 Ω resistors at both ends of the
network . Use the DIP switch to connect or disconnect the
termination resistors . See following wiring diagram . The
MD5 termination resistor (J-2) are active terminators . This
active circuit includes bins (“Pull-up” and “Pull-down”)
resistors .
• Connect the shield at each end of the cable to a drive .
On one end, connect the shield to terminal 28, and on
the other end connect to terminal 32 . Do not connect
the incoming and outgoing cable shields to the same
terminals, as that would make the shielding continuous .
•
For configuration information see the following:
—
Communication Setup – EFB on page 48
.
—
Activate Drive Control Functions – EFB on page
50
. .
Figure 7: Preferred Wiring Diagram
OM 1191 • MD5 VFD
46
www .DaikinApplied .com
e
Mbedded
f
ieldbUs
