ACS550 User’s Manual 245
Diagnostics
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).
• Undersized brake chopper (if present).
• 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.
5
RESERVED 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
AI1 LOSS Analog input 1 loss. Analog input value is less than AI1 FAULT LIMIT (3021).
Check for and correct:
• Source and connection for analog input.
• Parameter settings for
AI1 FAULT LIMIT (3021) and 3001 AI<MIN FUNCTION.
8
AI2 LOSS Analog input 2 loss. Analog input value is less than AI2 FAULT LIMIT (3022).
Check for and correct:
• Source and connection for analog input.
• Parameter settings for
AI2 FAULT LIMIT (3022) and 3001 AI<MIN FUNCTION.
9
MOT OVERTEMP 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: MOTOR TEMP MEAS
parameters.
10
PANEL LOSS Panel communication is lost and either:
• Drive is in local control mode (the control panel displays LOC), or
• Drive is in remote control mode (REM) and is parameterized to accept
start/stop, direction or reference from the control panel.
To correct check:
• Communication lines and connections.
• Parameter 3002
PANEL COMM ERR.
• Parameters in Group 10: START/STOP/DIR and Group 11:
REFERENCE SELECT (if drive operation is REM).
Fault
code
Fault name in
panel
Description and recommended corrective action
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