ABB ACH550-UH HVAC Benutzerhandbuch - Seite 2

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Flashing green – alarms

For less severe errors, called alarms, the diagnostic display is advisory. For these

situations, the drive is simply reporting that it had detected something "unusual." In

these situations, the drive:

• Flashes the green LED on the drive (does not apply to alarms that arise from

control panel operation errors).

• Sets an appropriate bit in an Alarm Word parameter (0308 or 0309). See

03: ACTUAL SIGNALS

• Overrides the control panel display with the display of an alarm code and/or

name.

Alarm messages disappear from the control panel display after a few seconds. The

message returns periodically as long as the alarm condition exists.

Correcting faults

The recommended corrective action for faults is:

• Use the

problem.

• Reset the drive. See

Fault listing

Fault

Code

Diagnostics

on page

Fault listing

table below to find and address the root cause of the

Fault resetting

Fault Name In

Panel

Output current is excessive. Check for and correct:

OVERCURRENT

• Excessive motor load.

• Insufficient acceleration time (parameters 2202

2205

ACCELER TIME

• Faulty motor, motor cables or connections.

Intermediate circuit DC voltage is excessive. Check for and correct:

DC OVERVOLT

• Static or transient overvoltages in the input power supply.

• Insufficient deceleration time (parameters 2203

2206

DECELER TIME

• Verify that overvoltage controller is ON (using parameter 2005).

Drive heatsink is overheated. Temperature is at or above limit.

DEV OVERTEMP

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.

Fault current. Check for and correct:

SHORT CIRC

• A short-circuit in the motor cable(s) or motor.

• Supply disturbances.

1-87

for the bit definitions.

on page 1-287.

Description and Recommended Corrective Action

2).

ACH550-UH User's Manual

Group

1 and

ACCELER TIME

1 and

DECELER TIME