1-286 ACH550-UH User’s Manual
Diagnostics
History
For reference, the last three fault codes are stored into parameters 0401, 0412,
0413. For the most recent fault (identified by parameter 0401), the drive stores
additional data (in parameters 0402…0411) to aid in troubleshooting a problem. For
example, parameter 0404 stores the motor speed at the time of the fault.
To clear the fault history (all of the Group 04, Fault History parameters):
1. Using the control panel in Parameters mode, select parameter 0401.
2. Press EDIT.
3. Press UP and Down simultaneously.
4. Press SAVE.
Correcting alarms
The recommended corrective action for alarms is:
• Determine if the Alarm requires any corrective action (action is not always
required).
•Use Alarm listing below to find and address the root cause of the problem.
Alarm listing
The following table lists the alarms by code number and describes each.
Alarm
Code
Display Description
2001
OVERCURRENT Current limiting controller is active. 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.
2002 OVERVOLTAGE Over voltage controller is active. 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).
2003 UNDERVOLTAGE Under voltage controller is active. Check for and correct:
• Undervoltage on mains.
2004
DIR LOCK The change in direction being attempted is not allowed. Either:
• Do not attempt to change the direction of motor rotation, or
• Change parameter 1003
DIRECTION to allow direction change (if
reverse operation is safe).
2005
I/O COMM Fieldbus communication has timed out. Check for and correct:
• Fault setup (3018
COMM FAULT FUNC and 3019 COMM FAULT TIME).
• Communication settings (Group 51 or 53 as appropriate).
• Poor connections and/or noise on line.
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