YASKAWA Z1000U Technical Manual page 228

6.5 Alarm Detection
HOA Keypad Display
A digital input set to 67H (MEMOBUS/Modbus
test) was closed while the drive was running
Digital Operator Display
SrC
Cause
An input power supply wiring terminal is loose.
The fluctuation in the voltage of the input power
supply is too large.
HOA Keypad Display
UL3
Cause
Inappropriate parameter settings
Load has dropped or decreased significantly
HOA Keypad 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
HOA Keypad Display
WrUn
Cause
After a Run command has been entered, the drive
must wait for the time set to b1-11 to pass before
it can begin to operate the motor
228
Stop the drive and run the test again.
Phase Order Detection Fault
The phase rotation direction for the input power supply changed.
Investigate and correct the cause and reset the fault.
page 234.
Undertorque Detection 1
Drive output current 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.
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.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified.
Torque Specifications on page
• 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.
Waiting for Run
A Run command has been issued and the drive is waiting to begin running the motor.
This is not an error.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Minor Fault Name
Minor Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Refer to Wire Gauge and Tightening
54.
Minor Fault Name
Possible Solutions