6 Operating status messages
BU 0600 en-2319 179
6.1 Display of messages
LED indicators
The frequency inverter is equipped with several dual colour LEDs (red and green) for diagnostic
purposes.
• The device-specific LEDs (1) are labelled as "DEV" and "BUS" and "USB").
• The two status LEDs A and B (2), which are significant for communication in Industrial Ethernet are
not directly labelled and are only present in the SK 550P version ( BU 0620
).
Explanations for the individual LEDS are described below.
(1)
(2)
Figure 9: LEDs – status displays on the device
The LED labelled "DEV" indicates the general device status.
Status Meaning
Off • FI not ready for operation, no mains or control voltage
Flashing green (4 Hz) • FI is in switch-on block
• FI is in standby but not enabled
Flashing green and red alternately
(4 Hz)
Flashing red (2 Hz/ 1 Hz) • Output of the error number (e.g. Error 3: flashes three times and then
pauses)
simultaneously
• Update data are communicated
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