1-280 ACH550-UH User’s Manual
Diagnostics
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 on page 1-87 for the bit definitions.
• 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.
Correcting faults
The recommended corrective action for faults is:
• Use the Fault listing table below to find and address the root cause of the
problem.
• Reset the drive. See Fault resetting on page 1-285.
Fault listing
Fault
Code
Fault Name In
Panel
Description and Recommended Corrective Action
1
OVERCURRENT Output current is excessive. Check for and correct:
• Excessive motor load.
• Insufficient acceleration time (parameters 2202
ACCELER TIME 1 and
2205
ACCELER TIME 2).
• Faulty motor, motor cables or connections.
2
DC OVERVOLT Intermediate circuit DC voltage is excessive. Check for and correct:
• Static or transient overvoltages in the input power supply.
• Insufficient deceleration time (parameters 2203
DECELER TIME 1 and
2206
DECELER TIME 2).
• Verify that overvoltage controller is ON (using parameter 2005).
3
DEV OVERTEMP Drive heatsink is overheated. Temperature is at or above limit.
R1…R4 & R7/R8: 115 °C (239 °F)
R5/R6: 125 °C (257 °F)
Check for and correct:
• Fan failure.
• Obstructions in the air flow.
• Dirt or dust coating on the heat sink.
• Excessive ambient temperature.
• Excessive motor load.
4
SHORT CIRC Fault current. Check for and correct:
• A short-circuit in the motor cable(s) or motor.
• Supply disturbances.
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