24
ACH550 Installation, Operation and Maintenance Manual
ACH550-UH
Diagnostics
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.
• Output disconnect device not interlocked.
• Interaction with external input filter.
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).
• Interaction with external input filter.
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.
5
R
ESERVED
Not used.
6
DC
UNDERVOLT
Intermediate circuit DC voltage is not sufficient. Check for and correct:
• Missing phase in the input power supply.
• Blown fuse.
• Undervoltage on mains.
7
AI
1
LOSS
Analog input 1 loss. Analog input value is less than
AI
1
FLT
LIMIT
(3021).
Check for and correct:
• Source and connection for analog input.
• Parameter settings for
AI
1
FLT
LIMIT
(3021) and 3001
AI
<
MIN FUNCTION
.
8
AI
2
LOSS
Analog input 2 loss. Analog input value is less than
AI
2
FLT
LIMIT
(3022).
Check for and correct:
• Source and connection for analog input.
• Parameter settings for
AI
2
FLT
LIMIT
(3022) and 3001
AI
<
MIN FUNCTION
.
9
MOT
TEMP
Motor is too hot, based on either the drive’s estimate or on temperature
feedback.
• Check for overloaded motor.
• Adjust the parameters used for the estimate (3005…3009).
• Check the temperature sensors and Group 35 parameters.
