YASKAWA GA700 Technical Manual page 295

Code Name
Uv1 DC Bus Undervoltage
Note:
• Detected if the DC bus voltage drops below the level set in L2-05 [Undervoltage Detect Level (Uv1)] while the drive is running.
• The Uv1 detection level is about 190 V when using a 200 V class drive. For a 400 V class drive, the detection level is around 380 V. It
is about 350 V when E1-01 [Input AC Supply Voltage] is set lower than 400.
• Perform Fault Reset to clear the fault.
• Fault tracing cannot be executed.
Code Name
Uv2 Ctrl Power Supply Voltage
Fault
Note:
• Detected if the control power supply voltage has dropped.
• Perform Fault Reset to clear the fault.
• Fault tracing cannot be executed.
Code Name
Uv3 SoftCharge Bypass Circuit
Fault
Note:
• Perform Fault Reset to clear the fault.
• Fault tracing cannot be executed.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cause
Phase loss in the drive input power.
There is loose wiring in the drive input
power terminals.
Excessive fluctuation in the drive input
power voltage.
Power loss occurred.
The main circuit capacitors are worn.
The relay or contactor on the soft-charge
bypass relay is damaged.
Cause
The value set in L2-02
[MomentaryPowerLossRide-Thru Time]
was increased with the momentary
power loss recovery unit not connected
to the drive.
A drive hardware problem occurred.
Cause
The relay or contactor on the soft-charge
bypass relay is damaged.
Possible Solution
Check for any faulty wiring or disconnected wires
in the main circuit power supply, and fix any
problems.
Properly tighten the terminals according to the
specified tightening torque.
• Review the possible solutions for stabilizing the
drive input power.
• Take steps to stabilize the power supply.
• Check for any problems with the magnetic
contactor on the main circuit side if no problems
are found with the power supply.
Improve the power supply.
Check the capacitor maintenance period in U4-05
[CapacitorMaintenance]. If U4-05 exceeds 90%,
replace the control board or the entire drive. For
more information on replacing the control board,
contact Yaskawa or your nearest sales
representative.
Check monitor U4-06 [SChgBypassRelayMaint]
for the performance life of the soft-charge bypass
relay. If U4-06 exceeds 90%, replace the control
board or the entire drive. For more information on
replacing the control board, contact Yaskawa or
your nearest sales representative.
Possible Solution
Connect the momentary power loss recovery unit
to the drive.
• Restart the drive and check if the fault still
remains.
• Replace either the control board or the entire
drive if the fault continues. For instructions on
replacing the control board, contact Yaskawa or
your nearest sales representative.
Possible Solution
• Cycle power to the drive and see if the fault
reoccurs.
• Replace either the control board or the entire
drive if the fault continues.
• Check monitor U4-06 [SChgBypassRelayMaint]
for the performance life of the soft-charge
bypass relay. If U4-06 exceeds 90%, replace the
control board or the entire drive.
Note:
For more information on replacing the control
board, contact Yaskawa or your nearest sales
representative.
6.4 Fault
6
295