YASKAWA A1000 HHP Programming Manual page 211

Digital Operator Display
Cause
A digital input set to 67H (MEMOBUS/
Modbus test) was closed while the drive
was running.
Digital Operator Display
THo
Cause
The motor thermistor is not connected
properly.
Digital Operator Display
TrPC
Cause
IGBTs have reached 90% of their expected
performance life.
Digital Operator Display
UL3
Cause
Inappropriate parameter settings.
Load has dropped or decreased
significantly.
Digital Operator Display
UL4
Cause
Inappropriate parameter settings.
The load has dropped or decreased
significantly.
Digital Operator Display
Uv
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.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
MEMOBUS/Modbus Communication Test Mode Error
SE
Note: This alarm will not trigger a multi-function output terminal that is set for alarm output
(H2-oo = 10).
Stop the drive and run the test again.
Thermistor Disconnect
The thermistor used to detect motor temperature has become disconnected.
Check the thermistor wiring.
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Replace the drive.
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, AOLV/PM, and CLV/PM) less than L6-02 for longer than
L6-03 time.
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, CLV, AOLV/PM, and CLV/PM) 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:
• DC bus voltage dropped below the level specified in L2-05.
• Contactor to suppress inrush current in the drive was opened.
• 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.
• Check for loose terminals.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals.
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the specifications.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
2.5 Alarm Detection
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