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5.10.2.5 RS485 Serial Communication
An RS485 serial communications bus can be used with the
drive system. Up to 32 nodes can be connected as a bus,
or via drop cables from a common trunk line to 1 network
segment. Repeaters can be used to divide network
segments. Each repeater functions as a node within the
segment in which it is installed. Each node connected
within a given network must have a unique node address,
across all segments.
•
Connect RS485 serial communication wiring to
terminals (+)68 and (-)69.
•
Terminate each segment at both ends, using
either the termination switch (bus term on/off,
see
) on the drive module, or a
biased network termination resistor.
•
Connect a large surface of the shield to ground,
for example with a cable clamp or a conductive
cable gland.
•
Maintain the same ground potential throughout
the network by applying potential-equalizing
cables.
•
Prevent impedance mismatch by using the same
type of cable throughout the entire network.
Cable
Shielded twisted pair (STP)
Impedance
120
Ω
Maximum cable length
Station-to-station [m
(ft)]
500 (1640)
Total including drop
lines [m (ft)]
1200 (3937)
Table 5.15 Cable Information
5.10.3 Safe Torque Off (STO)
To run STO, extra wiring for the drive system is required.
Refer to
VLT
®
Frequency Converters Safe Torque Off
Operating Instructions
for further information.
5.11 Relay Output
The relay terminal is on the top plate of the drive module.
See
. Use an extended wiring harness to
connect the relay terminal of drive module 1 (the drive
module on the far left) to the terminal blocks on the
control shelf.
NOTICE
For reference, drive modules are numbered from left to
right.
Relay 1
•
Terminal 01: Common
•
Terminal 02: Normally open 400 V AC
•
Terminal 03: Normally closed 240 V AC
Relay 2
•
Terminal 04: Common
•
Terminal 05: Normally open 400 V AC
•
Terminal 06: Normally closed 240 V AC
Relay 1 and relay 2 are programmed in
parameter 5-40 Function Relay
,
parameter 5-41 On Delay,
Relay
, and
parameter 5-42 Off Delay, Relay
.
Use VLT
®
Relay Card MCB 105 option module for extra
relay outputs.
130BC554.11
Relay 1
Relay 2
03
02
240 V AC, 2 A
01
06
05
04
240 V AC, 2 A
400 V AC, 2 A
400 V AC, 2 A
Illustration 5.12 Extra Relay Outputs
Electrical Installation
VLT
®
Parallel Drive Modules
36
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MG37K302
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