YASKAWA CIMR-VU BA0001 Technical Manual page 290

6.5 Alarm Detection
Digital Operator Display
Cause
Phase loss in the drive input power.
Loose wiring in the drive input power
terminals.
There is a problem with the drive input power
voltage.
Drive internal circuitry is worn.
The drive input power transformer is not large
enough and voltage drops when the power is
switched on.
Air inside the drive is too hot.
The CHARGE indicator light is broken or
disconnected.
290
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 level specified in L2-05.
Uv
• 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 under L2-05.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque specified in this manual to fasten the terminals.
Wire Gauges and Tightening Torques on page
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the
specifications.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
• 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.
• Check the temperature inside the drive.
• Replace the drive.
Minor Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Refer to
58.
Minor Fault
(H2-oo = 10)
YES