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State
Bicolor LED
Status
No
Power/Not
on-line
Off
–
The option has not completed “Duplicate
MAC ID” test yet or may not be powered.
On-line, not
connected
Green
The option is on-line, but not allocated
to a master.
On-line and
connected
Green
The DeviceNet option is on-line and
connected to a master.
Connection
timeout
Red
One or more I/O connections are in
timeout state.
Critical link
failure
Red
–
Table 8.2 LED: Network Status (NS)
8.2 No Communication with the Frequency
Converter
When there is no communication with the frequency
converter, proceed with the following checks:
1.
Check that cabling is correct.
Check that the cables are connected to the
correct terminals as shown in
Pin number
Terminal
Color
Name
1
V-
Black
GND
2
CAN_L
Blue
CAN LOW
3
Drain
(bare)
Screen
4
CAN_H
White
CAN HIGH
5
V+
Red
+24 V
Illustration 8.2 Correct Cabling
2.
The 24 V network voltage is applied.
3.
The correct EDS file is installed. Download the
correct EDS file from
.
4.
Check that the bus connection is terminated at
both ends.
If not, terminate the bus connection with
termination resistors at the initial and final nodes.
Refer to
. Termination is performed
between terminal 2 (CAN_L) and 4 (CAN_H) with
a resistor: 121
Ω
, 1% metal film, ¼ W.
24 V
Trunk line
Power supply
Drop lines 1
RT=Termination resistors
R
T
R
T
195NA228.10
1
1
1
1
Illustration 8.3 Topology
8.3 Frequency Converter Does Not Respond
to Control Signals
For Danfoss control word profile (instances 100/150 and
101/151), check that:
1.
The control word is valid.
When bit 10=0 in the control word, the frequency
converter does not accept the control word,
because the default setting is bit 10=1.
Set bit 10=1 via the PLC.
2.
The relationship between bits in the control word
and the terminal I/O is correct.
Check the logical relationship in the frequency
converter.
Set the logic to bit 3=1 and digital input=1 to
achieve a successful start.
Define the logical relationship in
parameter 8-50 Coasting
Select
to
parameter 8-56 Preset Reference Select
according to
the following range of options. Select the FC control mode,
digital input and/or bus communication, using
Troubleshooting
Programming Guide
MG92F102
Danfoss A/S © 12/2015 All rights reserved.
41
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8
Содержание VLT DeviceNet MCA 104
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