Troubleshooting; Diagnosis; No Response To Control Signals - Danfoss VLT Midi Drive FC 280 Programming Manual

Troubleshooting

8 Troubleshooting

8.1 Diagnosis

PROFIBUS DP provides a flexible way of performing
diagnosis of slave units, based on diagnosis messages.
During normal cyclic data exchange:
1. The slave sets a diagnosis bit, which requests the
master to send a diagnosis message during the
next scan cycle, instead of the normal data
exchange.
2. The slave answers the master with a diagnosis
message consisting of standard diagnosis
information, 6 bytes, and possibly extended,
vendor-specific, diagnosis information. The
standard diagnosis messages cover a limited
range of general diagnosis possibilities, whereas
the extended diagnosis function offers detailed
8 8
messaging specific to the frequency converter.
See chapter 8.3 Warnings and Alarms for the extended
diagnosis messages for the frequency converter.
A master or a network analyzing tool is able to translate
these diagnosis words into real text messages using the
GSD file.
NOTICE
DP-V1 diagnosis is supported for PROFIBUS SW version
2.X and later versions. The default setting of the
PROFIBUS option is DP-V1 diagnosis.
When DP-V0 diagnosis is required, change the setting
under DP slave Properties.

8.2 No Response to Control Signals

Check that:
•
The control word is valid.
When bit 10 = 0 in the control word, the
frequency converter does not accept the control
word. The default setting is bit 10 = 1. Set bit 10
= 1 via the PLC.
•
The relationship between bits in the control word
and the terminal I/Os 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.
Select the FC control mode, digital input, and/or serial
communication, using parameter 8-50 Coasting Select to
parameter 8-58 Profidrive OFF3 Select.
50
PROFIBUS DP
Selecting control mode for parameter 8-50 Coasting
Select, parameter 8-51 Quick Stop Select, and
parameter 8-52 DC Brake Select:
If [0] Digital input is selected, the terminals control the
coast and DC brake functions.
NOTICE
Coasting, quick stop, and DC brake functions are active
for logic 0.
Terminal
0
0
1
1
Table 8.1 [0] Digital Input
If [1] Serial communication is selected, commands are
activated only when given via serial communication.
Terminal
0
0
1
1
Table 8.2 [1] Serial Communication
If [2] Logic AND is selected, activate both signals to perform
the function.
Terminal
0
0
1
1
Table 8.3 [2] Logic AND
If [3] Logic OR is selected, activation of 1 signal activates
the function.
Terminal
0
0
1
1
Table 8.4 [3] Logic OR
Danfoss A/S © 05/2016 All rights reserved.
Bit 02/03/04 Function
0 Coast/DC brake/Q-stop
1 Coast/DC brake/Q-stop
0 No coast/DC brake/Q-stop
1 No coast/DC brake/Q-stop
Bit 02/03/04 Function
0 Coast/DC brake/Q-stop
1 No coast/DC brake/Q-stop
0 Coast/DC brake/Q-stop
1 No coast/DC brake/Q-stop
Bit 02/03/04 Function
0 Coast/DC brake/Q-stop
1 No coast/DC brake/Q-stop
0 No coast/DC brake/Q-stop
1 No coast/DC brake/Q-stop
Bit 02/03/04 Function
0 Coast/DC brake/Q-stop
1 Coast/DC brake/Q-stop
0 Coast/DC brake/Q-stop
1 No coast/DC brake/Q-stop
MG07F102