YASKAWA V1000 Series Technical Manual page 242

6.5 Alarm Detection
Cause
Inappropriate parameter settings.
Load has dropped or decreased significantly.
LED Operator Display
Cause
Inappropriate parameter settings.
The load has dropped or decreased significantly.
LED 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. • Replace the drive.
242
Check parameters L6-02 and L6-03.
Check for broken parts in the transmission system.
Undertorque Detection 2
UL4
Drive output current (or torque in OLV) less than L6-05 for longer than L6-06 time.
Check parameters L6-05 and L6-06.
Check for broken parts in the transmission system.
Undervoltage
One of the following conditions was true when the drive was stopped and a run command was entered:
Uv • DC bus voltage dropped below the level specified in L2-05.
• 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.
Torque on page 41
• 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.
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Refer to Wire Gauges and Tightening
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Minor Fault
Output
(H2-oo = 10)
YES
YES
Minor Fault
Output
(H2-oo = 10)
YES
YES
Minor Fault
Output
(H2-oo = 10)
YES
YES
YES
YES
YES
YES
YES