YASKAWA V1000 Technical Manual page 263

Braking function is being used in PM Open
Loop Vector Control.
Motor hunting occurs.
LED Operator Display
Cause
There is phase loss in the drive input power.
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.
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.
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.
LED Operator Display
Cause
The braking transistor is damaged.
The control circuit is damaged.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Connect a braking resistor.
• Adjust the parameters that control hunting.
• Set the hunting prevention gain (n1-02).
• Adjust the AFR time constant 1 (n2-02) and the AFR time constant 2 (n2-03) when in OLV Control.
• Use parameters n8-45 (PM Speed Feedback Detection Suppression Gain)
and n8-47 (Pull-In Current Compensation Time Constant).
Input Phase Loss
PF
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected
when L8-05 = 1 (enabled).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
• Ensure the terminals are tightened properly.
• Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque on page 56
• 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.
Dynamic Braking Transistor
rr
The built-in dynamic braking transistor failed.
• Cycle power to the drive and check if the fault reoccurs.
Faults on page
• Replace the drive if the fault continues.
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
279.
6.4 Fault Detection
Refer to Wire Gauges
Refer to Diagnosing and Resetting
6
263