Fault Reset When Run Command Entered; Undertorque Detection 1; Undertorque Detection 2; Undervoltage - YASKAWA V1000 Series Installation & Start-Up Manual

A motor switch command was
entered during run.
LED Operator Display
rUnC
Cause
Fault reset was being
executed when a run
command was entered.
LED Operator Display
UL3
Cause
Inappropriate parameter
settings.
Load has dropped or
decreased significantly.
LED Operator Display
UL4
Cause
Inappropriate parameter
settings.
The load has dropped or
decreased significantly.
LED Operator Display
Uv
Cause
Phase loss in the drive input
power.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Change the operation pattern so that the motor switch command
is entered while the drive is stopped.

Fault Reset when Run Command Entered

Fault reset was being executed when a run command was entered.
Possible Solutions
• Ensure that a run command cannot be entered from the external
terminals or option card during fault reset.
• Turn off the run command.

Undertorque Detection 1

Drive output current (or torque in OLV) less than L6-02 for longer than L6-03 time.
Possible Solutions
Check parameters L6-02 and L6-03.
• Check for broken parts in the transmission system.

Undertorque Detection 2

Drive output current (or torque in OLV) less than L6-05 for longer than L6-06 time.
Possible Solutions
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:
• 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.
Possible Solutions
Check for wiring errors in the main circuit drive input power.
Correct the wiring.
5.5 Alarm Detection
Minor Fault Name
Minor Fault Name
Minor Fault Name
Minor Fault Name
YES
Minor Fault (H2-
= 10)
YES
Minor Fault (H2-
= 10)
YES
YES
5
Minor Fault (H2-
= 10)
YES
YES
Minor Fault (H2-
= 10)
YES
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