Yaskawa J1000 Compact V/f Control Drive - Manual (Page 139)

Digital Operator Display Fault Name
The main circuit capacitors are
worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 is greater than 90%.
• Check for anything wrong with the drive input power.
• If nothing is wrong with the drive input power, try the following solutions if
the alarm continues:
• Set L8-05 to 0 to disable Input Phase Loss Protection selection. PF is detected
when DC bus ripple is too high. If it is disabled, there is no fault but the ripple
is still too high, the capacitors are stressed more and lose lifetime.
• Replace the drive.
Digital Operator Display Fault Name
rH
Braking Resistor Overheat
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
Cause Possible Solution
Deceleration time is too short and
excessive regenerative energy is
flowing back into the drive.
• Check the load, deceleration time and speed.
• Reduce the load.
• Increase the acceleration and deceleration times (C1-01 through C1-04).
• Replace the braking option with a larger device that can handle the power that
is discharged.
Excessive braking inertia.
Recalculate braking load and braking power. Then try reducing the braking load
and checking the braking resistor settings and improve braking capacity.
The proper braking resistor has not
been installed.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using
the braking resistor more frequently than its rating trips the alarm even when the braking resistor surface is not very
hot.
Digital Operator Display Fault Name
Uv1
DC Bus Undervoltage
One of the following conditions occurred while the drive was in operation:
• Voltage in the DC bus fell below the undervoltage detection level.
• For 200 V class: approximately 190 V (160 V for single phase drives)
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400)
The fault is output only if L2-01 = 0 or L2-01 = 1 and the DC bus voltage is
under L2-05 for longer than L2-02.
Cause Possible Solution
Input power phase loss.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
One of the drive input power wiring
terminals is loose.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and Tightening Torques on page 46 for details.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710606 26D YASKAWA AC Drive – J1000 Quick Start Guide 139
5
Troubleshooting