No Communication With The Frequency Converter - Danfoss VLT DeviceNet MCA 104 Programming Manual

Troubleshooting
State Bicolor LED
No Off –
Power/Not
on-line
On-line, not Green
connected
On-line and Green
connected
Connection Red
timeout
Critical link Red
failure
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 Illustration 8.2.
Pin number Terminal
1 V-
2 CAN_L
3 Drain
4 CAN_H
5 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 www.danfoss.com/drives.
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 Illustration 8.3. Termination is performed
between terminal 2 (CAN_L) and 4 (CAN_H) with
a resistor: 121 Ω, 1% metal film, ¼ W.
MG92F102
Programming Guide
Color Name
Black GND
Blue CAN LOW
(bare) Screen
White CAN HIGH
Red +24 V
Danfoss A/S © 12/2015 All rights reserved.
Status
The option has not completed "Duplicate
MAC ID" test yet or may not be powered.
The option is on-line, but not allocated
to a master.
The DeviceNet option is on-line and
connected to a master.
One or more I/O connections are in
timeout state.
–
24 V
Power supply
Trunk line
R
T
1 1
Drop lines 1
RT=Termination resistors
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
R
T
1
1
41
8 8