372 Diagnostics and maintenance
ACH550-01 User's Manual
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).
3
DEV OVERTEMP Drive heatsink is overheated. Temperature is
at or above limit.
R1…R4: 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 in mains.
7
AI1 LOSS Analogue input 1 loss. Analogue input value
is less than
AI1 FAULT LIMIT (3021). Check for
and correct:
• source and connection for analogue input
• parameter settings for
AI1 FAULT LIMIT
(3021) and 3001
AI<MIN FUNCTION.
Fault
code
Fault name in
the panel
Description and
recommended corrective action
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