YASKAWA L1000A Technical Manual page 273

Digital Operator Display
PGoH
Cause
Encoder cable is disconnected.
Digital Operator Display
SE
Cause
A digital input set to 67H (MEMOBUS/Modbus
test) was closed while the drive was running.
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.
Drive internal circuitry is worn.
The drive input power transformer is too small and
voltage drops when the power is switched on.
Air inside the drive is too hot.
The CHARGE light is broken or disconnected.
Digital Operator Display
voF
Cause
Hardware is damaged.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Encoder Disconnected (detected when using an encoder)
Encoder cable has become disconnected.
Reconnect the cable.
MEMOBUS/Modbus Self Test Failed
Stop the drive and run the test again.
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Note: This alarm will not trigger a multi-function output terminal that is set for alarm output (H2-
Replace the drive.
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, 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, 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 Up/Down 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.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified.
• 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 either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
• Check the temperature inside the drive.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
Output Voltage Detection Error
There is a problem with the output voltage.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
6.4 Alarm Detection
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
Refer to Wire Gauges and Tightening Torque on page 62
Minor Fault Name
Possible Solutions
= 10).
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