IOM SYSCREW AIR EVO HSE

79
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10 - Troubleshooting (continued)
The table below lists anomalies of operation, causes and corrective measures, specifically related to pump inverter (optional).
S.NO.
WARNING /
ALARM NO.
DESCRIPTION TROUBLESHOOTING
1 W/A2 Live zero error
→ Check connections on all analog mains terminals.
→ Control card terminals 53 and 54 for signals, terminal 55 common
→ VLT® General Purpose I/O MCB 101 terminals 11 and 12 for signals, terminal 10
common
→ VLT® Analog I/O Option MCB 109 terminals 1, 3, and 5 for signals, terminals 2, 4, and
6 common.
→ Check that the frequency converter programming and switch settings to match the
analog signal type.
→ Perform an input terminal signal test.
2 W/A7 DC over voltage
→ Connect a brake resistor.
→ Extend the ramp time.
→ Change the ramp type.
→ Activate the functions in parameter 2-10 Brake Function.
→ Increase parameter 14-26 Trip Delay at Inverter Fault.
→ If the alarm/warning occurs during a power sag, use kinetic back-up (parameter 14-10
MainsFailure).
3 W/A8 DC under voltage
→ Check that the supply voltage matches the frequency converter voltage.
→ Perform an input voltage test.
→ Perform a soft charge circuit test.
4 W/A9 Inverter overloaded
→ Compare the output current shown on the LCP with the frequency converter rated
current.
→ Compare the output current shown on the LCPwith the measured motor current.
→ Show the thermal frequency converter load onthe LCP and monitor the value. When
running above the frequency converter continuous current rating, the counter increases.
When running below the frequency converter
continuous current rating, the counter decreases.
5 W/A10
Motor ETR over
temperature
Check for motor overheating:
→ Check if the motor is mechanically overloaded.
→ Check that the motor current set in parameter 1-24 Motor Current is correct.
→ Ensure that the motor data in parameters 1–20 to 1–25 are set correctly.
→ If an external fan is in use, check that it is selected in parameter 1-91 Motor External
Fan.
→ Running AMA in parameter 1-29 Automatic Motor Adaptation (AMA) tunes the frequency
converter to the motor more accurately and reduces
thermal loading
6 W/A11
Motor thermistor over
temperature
Check for motor overheating:
→ Check if the motor is mechanically overloaded.
→ When using terminal 53 or 54, check that the thermistor is connected correctly between
either terminal 53 or 54 (analog voltage input) and terminal 50 (+10 V supply). Also
check that the terminal switch for 53 or 54 is set for voltage. Check that parameter 1–93
Thermistor Source
selects terminal 53 or 54.
→ When using terminal 18, 19, 31, 32, or 33 (digital inputs), check that the thermistor is
connected correctly between the digital input terminal used (digital input PNP only) and
terminal 50. Select the terminal to use in parameter 1–93 Thermistor Source.
7 W/A12 Torque limit
→ If the motor torque limit is exceeded during ramp-up, extend the ramp-up time.
→ If the generator torque limit is exceeded during ramp-down, extend the ramp-down time.
→ If torque limit occurs while running, increase the torque limit. Make sure that the system
can operate safely at a higher torque.
→ Check the application for excessive current draw on the motor.
8 W/A27
Brake chopper short-
circuited
→ Remove power to the frequency converter and remove the brake resistor.
9 A4 Mains phase loss → Check the supply voltage and supply currents to the frequency converter.
10 A13 Over Current
→ Remove the power and check if the motor shaft can be turned.
→ Check that the motor size matches the frequency converter.
→ Check that the motor data is correct in parameters 1-20 to 1-25.