Troubleshooting
WARNING
HIGH VOLTAGE
AC drives contain high voltage when connected to AC mains input, DC supply, or load sharing. Failure to perform installation,
start-up, and maintenance by qualified personnel can result in death or serious injury.
-
Only qualified personnel must perform installation, start-up, and maintenance.
• Disconnect power before proceeding.
• Remove the power to the drive and repair the short circuit.
8.4.17 WARNING/ALARM 17, Control Word Timeout
Cause
There is no communication to the drive. The warning is only active when parameter 8-04 Control Word Timeout Function is NOT set to [0]
Off.
If parameter 8-04 Control Word Timeout Function is set to [5] Stop and trip, a warning appears, and the drive ramps down to a stop and
shows an alarm.
Troubleshooting
• Check the connections on the serial communication cable.
• Increase parameter 8-03 Control Word Timeout Time.
• Check the operation of the communication equipment.
• Verify that proper EMC installation was performed.
8.4.18 WARNING/ALARM 20, Temp. Input Error
Cause
The temperature sensor is not connected.
8.4.19 WARNING/ALARM 21, Parameter Error
Cause
The parameter is out of range. The parameter number is shown in the display.
Troubleshooting
• Set the affected parameter to a valid value.
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707| 105
Danfoss A/S © 2020.01
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