Diagnosis and maintenance of ABB ACS550 frequency converter fault codes

The motor is overloaded for a long time.

The parameters of the electronic thermal protection model do not match (F10, F11, F12).

The wiring of the motor temperature sensor (PTC or PT100) is incorrect or damaged.

handle:

Check if the output current exceeds the rated value of the motor (check through parameter 0104).

Verify that F11 (overload detection level) should be equal to the motor nameplate current, and F12 (thermal time constant) should be set to 5 minutes for standard motors.

If the motor is equipped with a PTC sensor, select 4 (PTC) through parameter 3501 and connect it to AI1 or AI2. Note: PTC requires excitation current provided by AO1 or AO2 (parameter 1501=99 or 100).

If the actual motor temperature is not high, the protection can be temporarily blocked (F11=0.00), but it must be ensured that there is an external thermal relay.

3.6 Fault 10- PANEL LOSS (Control Panel Lost)

Reason: Communication interruption in the control panel, and the current control position is either local (LOC) or remote (REM), but the start stop/given source is from the panel.

handle:

Re plug and unplug the panel, and check if the RJ-45 cable is broken.

If using a remote panel, confirm that the cable length does not exceed 3 meters (EMC test length), as it is susceptible to interference if it is too long.

The actions after panel loss can be set through parameter 3002: 1=FAULT, 2=CONST SP7 (running at 1208 speed), and 3=Last SPEED (maintaining the last speed). For unmanned situations, it is recommended to set it to 2 or 3.

3.7 Fault 16- Earth Fault

Reason: The frequency converter has detected excessive ground leakage current in the motor or cable (including detection during operation and shutdown).

handle:

Check the insulation of the motor cable and eliminate any damage or water ingress.

If it is confirmed that the false alarm is caused by capacitive leakage of a long cable (>100 m), the detection sensitivity can be reduced by setting 3028=3 (HIGH) or directly disabling ground fault detection (3017=0). However, please note that disabling it may violate the warranty terms.

For the case where there is an EMI filter connected to the output terminal of the frequency converter, the leakage current will increase, and it may be considered to remove the output side filter.

3.8 Other common alarms

2001 OVECURRENT: Current limit controller activated (non faulty). Usually caused by load fluctuations or rapid acceleration. If it occurs frequently, extend the acceleration time or reduce the load.

2002 OVERVOLTAGE: Overvoltage controller activation, usually caused by too fast deceleration or grid harmonics. Extend deceleration time or install braking resistors.

2003 undervoltage controller activated. Check the power supply voltage.

2008 PANEL LOSS: Panel loss alarm (non fault), if configured in alarm mode, the frequency converter can still operate but attention should be paid.

2010 MOTOR TEMP: Motor temperature alarm (approaching fault threshold). Check the load and cooling.

Key points for setting key parameter groups

4.1 Limiting and Acceleration/Deceleration (Group 20&22)

2001 MINIMUM SPEED: Minimum RPM (can be positive or negative). If set to 0 rpm, reversal is not allowed.

2002 MAXIMUM SPEED: Maximum RPM.

2003 MAX CURRENT: Maximum output current limit (% of I2hd). Usually set at 150-200%.

2202 ACCELER TIME 1/2203 DECELER TIME 1: Acceleration and deceleration time. For square torque loads (fans, pumps), it is recommended to wait for 20~60 seconds; For constant torque loads, 5-20 seconds.

2204 RAMP SHAPE 1: Set 0 as a linear slope; If set to non-zero, it is an S-curve used for smooth start stop.

4.2 Digital Input/Output Redefine (Group 10/14/15)

By modifying parameters such as E01 (DI1 function), digital inputs can be assigned to multiple functions, such as:

9=THR (External Fault)

10=JOG (Jog)

11=Hz2/Hz1 (switching frequency given source)

12=M2/M1 (switch motor 2 parameters)

The relay outputs (1401~1403) can be set to 1=READY, 2=RUN, 3=FAILT (-1), 35=COMM (controlled by fieldbus), etc.

4.3 PID Control (Group 40)

For applications such as constant pressure water supply and constant flow air supply, set:

4001 GAIN=1.0 (adjusted from small to large)

4002 INTEGRATION TIME = 60 s

4010 SET POINT SEL=1 (given by AI1) or 0 (given by keyboard)

4014 FBK SEL=1 (ACT1, i.e. feedback signal source)

4016 ACT1 INPUT=2 (AI2 as feedback input)

Adjustment method: Gradually increase 4001 until the system oscillates, then decrease to 0.4-0.6 times, then decrease the integration time until it oscillates again, and then increase to 1.15-1.5 times. The feedback signal needs to be stable.

4.4 PFC Pump/Fan Control (Group 81)

PFC mode can automatically start and stop auxiliary motors to maintain constant pressure/flow. Key parameters:

8109 START FREQ 1: First auxiliary machine starting frequency (e.g. 48 Hz)

8112 LOW FREQ 1: First auxiliary machine stop frequency (e.g. 40 Hz)

8115 AUX MOT START D/8116 AUX MOT STOP D: Start stop delay (anti shake)

8117 NR OF AUX MOT: Number of auxiliary machines

8123 PFC ENABLE=1 (activated)

Attention: When enabling PFC, 9904 must be set to 3 (scalar mode), and relay outputs must be assigned to each auxiliary machine (set to 31 for 1401~1403).