ACS 400 User’s Manual 19
Q Protection Features
The ACS 400 has a number of protective features:
The ACS 400 has the following LED alarm and fault indicators:
• For location of LEDs, see section E or, if an ACS-PAN-A control panel is connected, see
“Programming” on page 25.
Note! Whenever the ACS 400 detects a fault condition, the fault relay activates. The motor
stops and the ACS 400 will wait to be reset. If the fault still persists and no external
cause has been identified, contact your local ABB sales or service office.
• Overcurrent
• Overvoltage
• Undervoltage
• Overtemperature
• Output ground fault
• Output short circuit
• Input phase loss (3~)
• I/O terminal short circuit protection
• Motor overload protection (see Section R)
• Output overload protection (see Section S)
• Stall protection
• Underload
Red LED: off
Green LED: blinking
ABNORMAL CONDITION
ABNORMAL CONDITION:
• ACS 400 cannot fully follow control
commands.
• Blinking lasts 15 seconds.
POSSIBLE CAUSES:
• Acceleration or deceleration ramp is
too fast in relation to load torque
requirement
• A momentary power interruption
Red LED: on
Green LED: on
FAULT
ACTION:
• Apply a stop signal to reset fault.
• Apply a start signal to restart the drive.
NOTE:
If the drive fails to start, check that the
input voltage is within the tolerance range.
POSSIBLE CAUSES:
• Transient overcurrent
• Over-/undervoltage
• Overtemperature
CHECK:
• the supply line for disturbances.
• the drive for mechanical problems that
might cause overcurrent.
• that the heat sink is clean.
Red LED: blinking
Green LED: on
FAULT
ACTION:
• Turn the power off.
• Wait for the LED’s to turn off.
• Turn the power back on.
Caution! This action may start the drive.
POSSIBLE CAUSE:
• Output ground fault
• Short circuit
• DC bus ripple too large
CHECK:
• the insulation in the motor circuit.
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