ACH550-UH User’s Manual 1-279
Diagnostics
Diagnostics
Warning! Do not attempt any measurement, parts replacement or other service
procedure not described in this manual. Such action will void the warranty, may
endanger correct operation, and increase downtime and expense.
Warning! All electrical installation and maintenance work described in this chapter
should only be undertaken by qualified service personnel. The Safety instructions on
the first pages of this manual must be followed.
Diagnostic displays
The drive detects error situations and reports them using:
• The green and red LED on the body of the drive
• The status LED on the control panel (if the HVAC control panel is attached to the
drive)
• The control panel display (if the HVAC control panel is attached to the drive)
• The Fault Word and Alarm Word parameter bits (parameters 0305 to 0309). See
Group 03: ACTUAL SIGNALS on page 1-87.
The form of the display depends on the severity of the error. You can specify the
severity for many errors by directing the drive to:
• Ignore the error situation.
• Report the situation as an alarm.
• Report the situation as a fault.
Red – faults
The drive signals that it has detected a severe error, or fault, by:
• Enabling the red LED on the drive (LED is either steady on or blinking).
• Setting an appropriate bit in a Fault Word parameter (0305 to 0307).
• Overriding the control panel display with the display of a fault code.
• Stopping the motor (if it was on).
The fault code on the control panel display is temporary. Pressing any of the
following buttons removes the fault message: MENU, ENTER, UP button or DOWN
button. The message reappears after a few seconds if the control panel is not
touched and the fault is still active.
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