Danfoss VLT PROFIBUS DP MCA 101 User Manual

8 Troubleshooting
8.1 Diagnosis
VLT
®
PROFIBUS DP MCA 101 provides a exible 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-specic, diagnosis information. The
standard diagnosis messages cover a limited
range of general diagnosis possibilities, whereas
the extended diagnosis function oers detailed
messaging specic 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 le.
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 8-56 Preset Reference Select.
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 Bit 02/03/04 Function
0 0 Coast/DC brake/Q-stop
0 1 Coast/DC brake/Q-stop
1 0 No coast/DC brake/Q-stop
1 1 No coast/DC brake/Q-stop
Table 8.1 [0] Digital Input
If [1] Serial communication is selected, commands are
activated only when given via serial communication.
Terminal Bit 02/03/04 Function
0 0 Coast/DC brake/Q-stop
0 1 No coast/DC brake/Q-stop
1 0 Coast/DC brake/Q-stop
1 1 No coast/DC brake/Q-stop
Table 8.2 [1] Serial Communication
If [2] Logic AND is selected, activate both signals to perform
the function.
Terminal Bit 02/03/04 Function
0 0 Coast/DC brake/Q-stop
0 1 No coast/DC brake/Q-stop
1 0 No coast/DC brake/Q-stop
1 1 No coast/DC brake/Q-stop
Table 8.3 [2] Logic AND
If [3] Logic OR is selected, activation of 1 signal activates
the function.
Terminal Bit 02/03/04 Function
0 0 Coast/DC brake/Q-stop
0 1 Coast/DC brake/Q-stop
1 0 Coast/DC brake/Q-stop
1 1 No coast/DC brake/Q-stop
Table 8.4 [3] Logic OR
Troubleshooting Programming Guide
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Danfoss VLT PROFIBUS DP MCA 101 Specifications

General

Brand	Danfoss
Model	VLT PROFIBUS DP MCA 101
Category	Media Converter
Language	English