YASKAWA GA700 - Page 373

Troubleshooting
6
6.5 Minor Faults/Alarms
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 373
Code Name Causes Possible Solutions
UL5 Mechanical Weakening
Detection 2
The drive detected undertorque as
specified by the conditions for
mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect
Select].
Examine the machine for deterioration.
Note:
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name Causes Possible Solutions
Uv Undervoltage The drive input power voltage is
changing too much.
• Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the
magnetic contactor on the main circuit side for
problems.
There is a phase loss in the drive input
power.
Correct errors with the wiring for main circuit
drive input power.
There is loose wiring in the drive input
power terminals.
Tighten the terminal screws to the correct
tightening torque.
There was a loss of power. Use a better power supply.
The main circuit capacitors have
become unserviceable.
Examine the capacitor maintenance time in
monitor U4-05 [CapacitorMaintenance]. If U4-05
is more than 90%, replace the control board or the
drive. For information about 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 a molded-case circuit
breaker, Leakage Breaker (ELCB, GFCI, or
RCM/RCD) (with overcurrent protective
function), or magnetic contactor is ON.
• Check the capacity of the drive power supply
transformer.
Air inside the drive is too hot. Check the ambient temperature of the drive.
The Charge LED is broken. Replace the control board or the entire drive. For
information about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Note:
• The drive detects this error if one of these conditions is correct when the Run command has not been input (while the drive is stopped).
–The DC bus voltage < L2-05 [Undervoltage Detection Lvl (Uv1)].
–The Contactor that prevents inrush current in the drive was opened.
–There is low voltage in the control drive input power.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.