YASKAWA V1000 Series Installation & Start-Up Manual page 202

5.4 Fault Detection
There is loose wiring in the drive
input power terminals.
There is excessive fluctuation in the
drive input power voltage.
There is poor balance between
voltage phases.
Cause
The main circuit capacitors are
worn.
LED Operator Display
Cause
Pulse input (RP) is disconnected.
Pulse input (RP) wiring is wrong.
Motor brake engaged.
LED Operator Display
Cause
Deceleration time is too short and
excessive regenerative energy is
flowing back into the drive.
Excessive braking inertia.
The proper braking resistor has not
been installed.
202
• Ensure the terminals are tightened properly.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and Tightening Torque on page 65
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Disable Input Phase Loss Detection (L8-05 = "0"). PF is detected if DC bus
ripple is too high. If it is disabled, there is no fault but the ripple is still too
high, thereby the capacitors are stressed more and lose lifetime.
• Stabilize drive input power or disable phase loss detection.
• 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:
• Disable Input Phase Loss Protection selection (L8-05 = "0"). PF is detected if
DC bus ripple is too high. If it is disabled, there is no fault but the ripple is still
too high, thereby the capacitors are stressed more and lose lifetime.
• Replace the drive.
PG Disconnect (for Simple V/f with PG)
PGo
No PG pulses are received for longer than the time set to F1-14.
Reconnect the pulse input (RP).
Correct the wiring.
Ensure the motor brake releases properly.
Braking Resistor Overheat
rH
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
• Check the load, deceleration time and speed.
• Reduce the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Replace the braking option with a larger device that can handle the power that
is discharged.
Recalculate braking load and braking power. Then try reducing the braking
load and checking the braking resistor settings and improve braking capacity.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution