6.5 Alarm Detection Troubleshooting 6 SIEP C710606 33A OYMC AC Drive – J1000 User Manual 131 Cause Possible Solutions Minor Fault Output (H2-01 = 10) MEMOBUS/Modbus test has finished normally. This verifies that the test was successful. No output LED Operator Display Minor Fault Name SE MEMOBUS/Modbus Communication Test Mode Error Cause Possible Solutions Minor Fault Output (H2-01 = 10) A digital input programmed to 67H (MEMOBUS/Modbus test) was closed while the drive was running. Stop the drive and run the test again. No output LED Operator Display Minor Fault Name Uv Undervoltage One of the following conditions was true when the drive was stopped and a run command was entered:
• DC bus voltage dropped below the under voltage detection level. • Contactor to suppress inrush current in the drive was open. • Low voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC bus voltage is below the detection level. Cause Possible Solutions Minor Fault Output (H2-01 = 10) Phase loss in the drive input power. Check for wiring errors in the main circuit drive input power. Correct the wiring. YES Loose wiring in the drive input power terminals. • Ensure the terminals have been properly tightened. • Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and Tightening Torque on page 37 YES There is a problem with the drive input power voltage. • Check the voltage. • Lower the voltage of the drive input power so that it is within the limits listed in the specifications. YES Drive internal circuitry is worn. • Check the maintenance time for the capacitors (U4-05). • Replace the drive if U4-05 exceeds 90%. YES The drive input power transformer is not large enough and voltage drops when the power is switched on. • Check for a tripped alarm when the magnetic contactor, line breaker and leakage breaker are turned on. • Check the capacity of the drive input power transformer. YES Air inside the drive is too hot.
• Check the temperature inside the drive. YES The CHARGE indicator light is broken or disconnected. • Replace the drive. YES