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MG.10.P2.22 - VLT is a registered Danfoss trademark
Status LEDs
The Modbus RTU option card has two LEDs.
One LED is used as a status for Modbus RTU
communications and the other as a status
for VLT 6000 drive communications. Both
LEDs use the same communications
patterns. On power up, each LED state is
flashed on for 250 milliseconds (Red, Green,
Orange, Off). The VLT 6000 LED powers up
first, then the Modbus LED. After power up,
the following are the only valid states:
• Flashing Green (1 Hz): Communications
online (VLT 6000 LED) or receiving data
(Modbus LED)
• Flashing Red (1 Hz): Communications
time out
• Solid Red: Fault, communications halted
Option Card
Operability
Loop Back
Test
A loop back test to confirm Modbus RTU
option card operability can be performed. The
option card must be removed from the
adjustable frequency drive to gain access to
the 9-input dip switch for baud rate and parity
and to rewire the option card connectors.
Ensure that power has been
removed from adjustable fre-
quency drive for a minimum of
14 minutes to allow voltage to
dissipate.
• Remove the option card in accordance
with the procedures described in the
installation section of this manual.
• Set the dip switch positions in accordance
with the table below.
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9
ON ON ON OFF
OFF ON ON ON ON
DANGER
!
• Remove all wiring from both the 6-pin
option card connector and the 3-pin
EIA-485 connector.
• Wire the 6-pin option card connector to
the 3-pin EIA-485 connector as described
below.
• Apply power to the unit.
After the normal status LED check at
power-up (see Status LEDs), the loop back
test sets both LEDs to orange for a successful
test or red if the test fails. The orange or red
indicator lasts around 10-15 seconds. The
LEDs will then flash red or green
communication indications.
6-Pin Connector
EIA-485 Connector
Pin 2
to
Pin 3
to
Pin 4
to
Pin 3
Pin 2
Pin 1
Loop Back Test Switch Positions
VLT 6000 LED
Modbus LED
3-Pin EIA-485 Connector
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