198 ACS550 User’s Manual
Embedded fieldbus
For example:
Diagnostics – EFB
Fault queue for drive diagnostics
For general ACS550 diagnostics information, see chapter Diagnostics on page 243.
The three most recent ACS550 faults are reported to the fieldbus as defined below.
Serial communication diagnostics
Network problems can be caused by multiple sources. Some of these sources are:
• loose connections
• incorrect wiring (including swapped wires)
• bad grounding
• duplicate station numbers
• incorrect setup of drives or other devices on the network.
The major diagnostic features for fault tracing on an EFB network include Group 53:
EFB PROTOCOL parameters 5306…5309. Section Complete parameter
descriptions on page 98 describes these parameters in detail.
Feedback
integer
Parameter
resolution
Value of the
parameter that
defines 100%
(Feedback integer) · (Parameter resolution) ·
(Value of 100% ref.) / 100% = Scaled value
10 0.1% 1500 rpm
1
10 · 0.1% · 1500 RPM / 100% = 15 rpm
100 0.1% 500 Hz
2
100 · 0.1% · 500 Hz / 100% = 50 Hz
1
Assuming, for the sake of this example, that the Actual Value uses parameter 9908 MOT NOM SPEED
as the 100% reference and that 9908 = 1500 rpm.
2
Assuming, for the sake of this example, that the Actual Value uses parameter 9907 MOT NOM FREQ
as the 100% reference and that 9907 = 500 Hz.
Drive parameter
Modbus
protocol reference
ABB DRV DCU PROFILE
0401 LAST FAULT 40401
0412 PREVIOUS FAULT 1 40412
0413 PREVIOUS FAULT 2 40413
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