YASKAWA V1000 Series

5.6 Alarm Detection
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 235
Troubleshooting
5
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Inappropriate parameter settings. Check parameters L6-02 and L6-03. YES
The load has dropped or decreased
significantly.
Check for broken parts in the transmission system such as
a belt or pulley.
YES
LED Operator Display Minor Fault Name
UL4
Undertorque Detection 2
Drive output current (or torque in OLV) was less than L6-05 for longer than
the time set in L6-06.
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Inappropriate parameter settings. Check parameters L6-05 and L6-06. YES
The load has dropped or decreased
significantly.
Check for broken parts in the transmission system such as
a belt or pulley.
YES
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 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 is output only if L2-01 is not 0 and the DC bus voltage is under
L2-05.
Cause Possible Solutions
Minor Fault
Output
(H2- = 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 69
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
- YES
Drive internal circuitry has become
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