YASKAWA V1000 Series Installation & Start-Up Manual page 235

Cause
Inappropriate parameter settings.
The 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 has become
worn.
The drive input power transformer is
not large enough and voltage drops
when the power is switched on.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
Check parameters L6-02 and L6-03.
Check for broken parts in the transmission system such as
a belt or pulley.
Undertorque Detection 2
UL4
Drive output current (or torque in OLV) was less than L6-05 for longer than
the time set in L6-06.
Check parameters L6-05 and L6-06.
Check for broken parts in the transmission system such as
a belt or pulley.
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 is output only if L2-01 is not 0 and the 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.
Tightening Torque on page 69
• 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.
5.6 Alarm Detection
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Refer to Wire Gauges and
Minor Fault
Output
(H2- = 10)
YES
YES
Minor Fault
Output
(H2- = 10)
YES
YES
5
Minor Fault
Output
(H2- = 10)
YES
YES
YES
YES
YES
YES
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