Technical data

74 OM 1191
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.
DANGER
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 17.
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.
Flashing Green – Alarms
For less severe errors, called alarms, the diagnostic display
is advisory. For these situations, the drive is simply reporting
that it had detected something “unusual.” In these situations,
the drive:
• Flashes the green LED on the drive (does not apply to
alarms that arise from control panel operation errors).
• Sets an appropriate bit in an Alarm Word parameter
(0308or0309).SeeGroup 03: Actual Signals for the bit
denitions.
• Overrides the control panel display with the display of
an alarm code and/or name.
Alarm messages disappear from the control panel display
after a few seconds. The message returns periodically as long
as the alarm condition exists.
Diagnostics