YASKAWA A1000 HHP Programming Manual page 200

2.4 Fault Detection
Digital Operator Display
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
Digital Operator Display
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
Digital Operator Display
Cause
Undertorque was detected and matched the
conditions for mechanical loss detection set to
L6-08
Digital Operator Display
<1>
Cause
The internal current sensor has detected a
current unbalance situation.
<1> Detected in models 4A0930 and 4A1200.
Digital Operator Display
Cause
Input power phase loss
One of the drive input power wiring terminals
is loose
There is a problem with the voltage from the
drive input power
The power has been interrupted
The main circuit capacitors are worn
200
Undertorque Detection 1
UL3
The current has fallen below the minimum value set for Torque Detection Level 1 (L6-02) for longer than
the allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Undertorque Detection 2
UL4
The current has fallen below the minimum value set for Torque Detection Level 2 (L6-05) for longer than
the allowable time (L6-06).
Check L6-05 and L6-06 settings
Check the load for any problems.
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
Current Unbalance
UnbC
Current flow has become unbalanced.
• Check wiring
• Check for damaged transistors.
• Check for short circuits or grounding problems on the connected motor.
DC Bus Undervoltage
Voltage in the DC bus fell below the undervoltage detection level (L2-05).
• For 400 V class drives: approximately 380 V (350 V when E1-01 is less than 400)
Uv1
• For 575 V class drives: approximately 475 V
• For 690 V class drives: approximately 570 V
The fault is output only if L2-01 is set to 0 or 1 and the DC bus voltage has fallen below the level set to
L2-05 for longer than the time set to L2-02.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Check for loose terminals.
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main
circuit magnetic contactor.
Correct the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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