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ACH550-UH User’s Manual 1-
Diagnostics
Warning! Do not attempt any measurement, parts replacement or other service procedure not described in this manual. Such action will void the warranty, may endanger correct operation, and increase downtime and expense.
Warning! All electrical installation and maintenance work described in this chapter should only be undertaken by qualified service personnel. The Safety instructions on the first pages of this manual must be followed.
Diagnostic displays
The drive detects error situations and reports them using:
- The green and red LED on the body of the drive
- The status LED on the control panel (if the HVAC control panel is attached to the drive)
- The control panel display (if the HVAC control panel is attached to the drive)
- The Fault Word and Alarm Word parameter bits (parameters 0305 to 0309). See Group 03: ACTUAL SIGNALS on page 1-. The form of the display depends on the severity of the error. You can specify the severity for many errors by directing the drive to:
- Ignore the error situation.
- Report the situation as an alarm.
- Report the situation as a fault.
Red – faults The drive signals that it has detected a severe error, or fault, by:
- Enabling the red LED on the drive (LED is either steady on or blinking).
- Setting an appropriate bit in a Fault Word parameter (0305 to 0307).
- Overriding the control panel display with the display of a fault code.
- Stopping the motor (if it was on). The fault code on the control panel display is temporary. Pressing any of the following buttons removes the fault message: MENU, ENTER, UP button or DOWN button. The message reappears after a few seconds if the control panel is not touched and the fault is still active.
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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 Group 03: ACTUAL SIGNALS on page 1-87 for the bit definitions.
- 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 Fault listing table below to find and address the root cause of the problem.
- Reset the drive. See Fault resetting on page 1-.
Fault listing
Fault Code
Fault Name In Panel Description and Recommended Corrective Action 1 OVERCURRENT Output current is excessive. Check for and correct:
- Excessive motor load.
- Insufficient acceleration time (parameters 2202 ACCELER TIME 1 and 2205 ACCELER TIME 2).
- Faulty motor, motor cables or connections. 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).
- 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.
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16 EARTH FAULT Possible ground fault detected in the motor or motor cables. The drive monitors for ground faults while the drive is running and while the drive is not running. Detection is more sensitive when the drive is not running and can produce false positives. Possible corrections:
- Check for/correct faults in the input wiring.
- Verify that motor cable does not exceed maximum specified length.
- A delta grounded input power supply and motor cables with high capacitance may result in erroneous error reports during non-running tests. To disable response to fault monitoring when the drive is not running, use parameter 3023 WIRING FAULT. To disable response to all ground fault monitoring, use parameter 3017 EARTH FAULT. 17 UNDERLOAD Motor load is lower than expected. Check for and correct:
- Disconnected load.
- Group 37: USER LOAD CURVE. 18 THERM FAIL Internal fault. The thermistor measuring the internal temperature of the drive is open or shorted. Contact your local ABB sales representative. 19 OPEX LINK Internal fault. A communication-related problem has been detected on the fiber optic link between the OITF and OINT boards. Contact your local ABB sales representative. 20 OPEX PWR Internal fault. Low voltage condition detected on OINT power supply. Contact your local ABB sales representative. 21 CURR MEAS Internal fault. Current measurement is out of range. Contact your local ABB sales representative. 22 SUPPLY PHASE Ripple voltage in the DC link is too high. Check for and correct:
- Missing mains phase.
- Blown fuse. 23 ENCODER ERR Not used (Available only with encoder and parameter Group 50). 23 ENCODER ERR The drive is not detecting a valid encoder signal. Check for and correct:
- Encoder presence and proper connection (reverse wired, loose connection, or short circuit).
- Voltage logic levels are outside of the specified range.
- A working and properly connected Pulse Encoder Interface Module, OTAC-01.
- Wrong value entered in parameter 5001 PULSE NR. A wrong value will only be detected if the error is such that the calculated slip is greater than 4 times the rated slip of the motor.
- Encoder is not being used, but parameter 5002 ENCODER ENABLE = 1 ( ENABLED). 24 OVERSPEED Motor speed is greater than 120% of the larger (in magnitude) of 2001 MINIMUM SPEED or 2002 MAXIMUM SPEED. Check for and correct:
- Parameter settings for 2001 and 2002.
- Adequacy of motor braking torque.
- Applicability of torque control.
- Brake chopper and resistor. 25 RESERVED Not used as of the publication of this manual. 26 DRIVE ID Internal fault. Configuration Block Drive ID is not valid. Contact your local ABB sales representative.
Fault Code
Fault Name In Panel Description and Recommended Corrective Action
ACH550-UH User’s Manual 1-
27 CONFIG FILE Internal configuration file has an error. Contact your local ABB sales representative. 28 SERIAL 1 ERR Fieldbus communication has timed out. Check for and correct:
- Fault setup (3018 COMM FAULT FUNC and 3019 COMM FAULT TIME).
- Communication settings (Group 51 or 53 as appropriate).
- Poor connections and/or noise on line. 29 EFB CONFIG FILE
Error in reading the configuration file for the embedded fieldbus.
30 FORCE TRIP Fault trip forced by the fieldbus. See the fieldbus User’s Manual. 31 EFB 1 Fault code reserved for the embedded fieldbus (EFB) protocol application. 32 EFB 2 These codes are not used as of the publication of this manual. 33 EFB 3 34 MOTOR PHASE Fault in the motor circuit. One of the motor phases is lost. Check for and correct:
- Motor fault.
- Motor cable fault.
- Thermal relay fault (if used).
- Internal fault. 35 OUTPUT WIRING Possible power wiring error detected. When the drive is not running it monitors for an improper connection between the drive input power and the drive output. Check for and correct:
- Proper input wiring – line voltageis NOT connected to drive output.
- The fault can be erroneously declared if the input power is a delta grounded system and motor cable capacitance is large. This fault can be disabled using parameter 3023 WIRING FAULT. 36 INCOMP SWTYPE
The drive cannot use the software.
- Internal Fault.
- The loaded software is not compatible with the drive.
- Call support representative. 37 CB OVERTEMP Drive control board is overheated. Check for and correct:
- Excessive ambient temperatures
- Fan failure.
- Obstructions in the air flow. 101 SERF CORRUPT Error internal to the drive. Contact your local ABB sales representative and 102 RESERVED report the error number. 103 SERF MACRO 104 RESERVED 105 RESERVED
Fault Code
Fault Name In Panel Description and Recommended Corrective Action
ACH550-UH User’s Manual 1-
Fault resetting The ACH550 can be configured to automatically reset certain faults. Refer to parameter Group 31: Automatic Reset.
Warning! If an external source for start command is selected and it is active, the ACH550 may start immediately after fault reset.
Flashing red LED To reset the drive for faults indicated by a flashing red LED:
- Turn off the power for 5 minutes. Red LED To reset the drive for faults indicated by a red LED (on, not flashing), correct the problem and do one of the following:
- From the control panel, press RESET
- Turn off the power for 5 minutes. Depending on the value of 1604, FAULT RESET SELECT , the following could also be used to reset the drive:
- Digital input
- Serial communication When the fault has been corrected, the motor can be started.
1009 PAR PCU 1 Parameter values for power control are inconsistent: Improper motor nominal frequency or speed. Check for both of the following:
- 1 < (60 * 9907 MOTOR NOM FREQ / 9908 MOTOR NOM SPEED < 16
- 0.8 < 9908 MOTOR NOM SPEED / (120 * 9907 MOTOR NOM FREQ / Motor Poles) < 0. 1010 PAR PFA OVERRIDE
Both the override mode and PFA are activated at the same time. These modes are mutually incompatible, because PFA interlocks cannot be observed in the override mode. 1011 PAR OVERRIDE PARS
Overeride is enabled, but parameters are incompatible. Verify that 1701 is not zero, and (depending on 9904 value) 1702 or 1703 is not zero. 1012 PAR PFA IO (^1) IO configuration is not complete – not enough relays are parameterized to PFA. Or, a conflict exists between Group 14, parameter 8117, NR OF AUX MOT, and parameter 8118, AUTOCHNG INTERV. 1013 PAR PFA IO (^2) IO configuration is not complete – the actual number of PFA motors (parameter 8127, MOTORS) does not match the PFA motors in Group 14 and parameter 8118 AUTOCHNG INTERV. 1014 PAR PFA IO (^3) IO configuration is not complete – the drive is unable to allocate a digital input (interlock) for each PFA motor (parameters 8120 INTERLOCKS and 8127 MOTORS).
Fault Code
Fault Name In Panel Description and Recommended Corrective Action
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History For reference, the last three fault codes are stored into parameters 0401, 0412,
- For the most recent fault (identified by parameter 0401), the drive stores additional data (in parameters 0402…0411) to aid in troubleshooting a problem. For example, parameter 0404 stores the motor speed at the time of the fault. To clear the fault history (all of the Group 04, Fault History parameters):
- Using the control panel in Parameters mode, select parameter 0401.
- Press EDIT.
- Press UP and Down simultaneously.
- Press SAVE.
Correcting alarms
The recommended corrective action for alarms is:
- Determine if the Alarm requires any corrective action (action is not always required).
- Use Alarm listing below to find and address the root cause of the problem.
Alarm listing The following table lists the alarms by code number and describes each. Alarm Code Display^ Description 2001 OVERCURRENT Current limiting controller is active. Check for and correct:
- Excessive motor load.
- Insufficient acceleration time (parameters 2202 ACCELER TIME 1 and 2205 ACCELER TIME 2).
- Faulty motor, motor cables or connections. 2002 OVERVOLTAGE Over voltage controller is active. 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). 2003 UNDERVOLTAGE Under voltage controller is active. Check for and correct:
- Undervoltage on mains. 2004 DIR LOCK The change in direction being attempted is not allowed. Either:
- Do not attempt to change the direction of motor rotation, or
- Change parameter 1003 DIRECTION to allow direction change (if reverse operation is safe). 2005 I / O COMM Fieldbus communication has timed out. Check for and correct:
- Fault setup (3018 COMM FAULT FUNC and 3019 COMM FAULT TIME).
- Communication settings (Group 51 or 53 as appropriate).
- Poor connections and/or noise on line.
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Note 1. Even when the relay output is configured to indicate alarm conditions (e.g. parameter 1401 RELAY OUTPUT 1 = 5 ( ALARM) or 16 ( FLT / ALARM)), this alarm is not indicated by a relay output.
2015 PFA INTERLOCK This alarm warns that the PFA interlocks are active, which means that the drive cannot start the following:
- Any motor (when Autochange is used),
- The speed regulated motor (when Autochange is not used). 2016 Reserved 2017 OFF BUTTON Note 1. 2018 (note 1)
PID SLEEP This alarm warns that the PID sleep function is active, which means that the motor could accelerate when the PID sleep function ends.
- To control PID sleep, use parameters 4022…4026 or 4122…4126. 2019 ID RUN Performing ID run. 2020 OVERRIDE This alarm warns that the Override function is active, which may start the motor. 2021 START ENABLE 1 MISSING
This alarm warns that the Start Enable 1 signal is missing.
- To control Start Enable 1 function, use parameter 1608. To correct, check:
- Digital input configuration.
- Communication settings. 2022 START ENABLE 2 MISSING
This alarm warns that the Start Enable 2 signal is missing.
- To control Start Enable 2 function, use parameter 1609. To correct, check:
- Digital input configuration.
- Communication settings. 2023 EMERGENCY STOP
Emergency stop activated.
2024 ENCODER ERROR The drive is not detecting a valid encoder signal. Check for and correct:
- Encoder presence and proper connection (reverse wired, loose connection, or short circuit).
- Voltage logic levels are outside of the specified range.
- A working and properly connected Pulse Encoder Interface Module, OTAC-01.
- Wrong value entered in parameter 5001 PULSE NR. A wrong value will only be detected if the error is such that the calculated slip is greater than 4 times the rated slip of the motor.
- Encoder is not being used, but parameter 5002 ENCODER ENABLE = 1 ( ENABLED). 2025 FIRST START Signals that a the drive is performing a First Start evaluation of motor characteristics. This is normal the first time the motor is run after motor parameters are entered or changed. See parameter 9910 (MOTOR ID RUN) for a description of motor models. 2026 RESERVED Not used. 2027 USER LOAD CURVE
This alarm warns that the condition defined by parameter 3701 USER LOAD C MODE has been valid longer that half of the time difined by 3703 USER LOAD C TIME. 2028 START DELAY Shown during the Start delay. See parameter 2113 START DELAY.
Alarm Code Display^ Description
