Yaskawa iQpump1000 AC Drive Quick Start User Manual
Page 272
HOA Keypad Display
Minor Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable
time (L6-03).
Cause
Possible Solution
Parameter settings are not appropriate for
the load
Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side
Check the load for any problems.
HOA Keypad Display
Minor Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable
time (L6-06).
Cause
Possible Solution
Parameter settings are not appropriate for
the load
Check L6-05 and L6-06 settings
There is a fault on the machine side
Check the load for any problems.
HOA Keypad Display
Minor Fault Name
UL6
Motor Underload
The load has fallen below the underload curve defined in L6-14.
Cause
Possible Solution
The output current has fallen below the
motor underload curve defined in L6-14 for
longer than the time set to L6-03
Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal
operation.
HOA Keypad Display
Minor Fault Name
Uv
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.
Cause
Possible Solution
Phase loss in the drive input power.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
Loose wiring in the drive input power
terminals.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified.
Refer to Main Circuit Wire Gauges and
There is a problem with the drive input
power voltage.
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the specifications.
Drive internal circuitry is worn.
• 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.
The drive input power transformer is too
small and voltage drops when the power is
switched on.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
Air inside the drive is too hot.
Check the temperature inside the drive.
The CHARGE light is broken or
disconnected.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
HOA Keypad Display
Minor Fault Name
voF
Output Voltage Detection Error
Problem detected with the voltage on the output side of the drive.
Cause
Possible Solution
Hardware is damaged. Internal drive
module MC / FAN overheat protection
circuit board is due to abnormal ambient
operating power.
• Lower ambient temperature.
• Replace the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or a Yaskawa representative.
5.3 Alarm Detection
272
YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide