YASKAWA Z1000U Technical Manual page 220

6.4 Fault Detection
HOA Keypad Display
UL5
Cause
Undertorque was detected and matched the
conditions for mechanical loss detection set to
L6-08
HOA Keypad Display
Uv1
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
The relay or contactor on the soft-charge bypass
circuit is damaged
HOA Keypad Display
Uv2
Cause
Internal circuitry is damaged
HOA Keypad Display
Uv3
Cause
The relay or contactor on the soft-charge bypass
circuit is damaged
220
Mechanical Weakening Detection 2
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
Control Circuit Undervoltage Fault
Voltage in the control circuit fell below the detection level:
• For 200 V class drives: approximately 175 V
• For 400 V class drives: approximately 350 V
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque Specifications on page 54
• 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.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on
replacing the control board, contact Yaskawa or a Yaskawa representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on
replacing the control board, contact Yaskawa or a Yaskawa representative.
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on
replacing the control board, contact Yaskawa or a Yaskawa representative.
Undervoltage 3 (Soft-Charge Bypass Relay Fault)
The soft-charge bypass relay failed.
• Cycle power to the drive.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales
representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the entire drive if U4-06 exceeds 90%. Contact Yaskawa or your nearest sales
representative.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Fault Name
Possible Solution
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Wire Gauge