YASKAWA V1000 Series Technical Manual page 236

6.4 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.
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.
LED Operator Display
Cause
Speed Search parameters are set to the wrong values.
The motor is coasting in the opposite direction of the run
command.
LED Operator Display
Cause
The wrong motor code has been set (Yaskawa motors only).
Load is too heavy.
Load inertia is too heavy.
Acceleration and deceleration times are too short.
LED Operator Display
Cause
Parameter settings are not appropriate for the type of load. Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side.
236
• Ensure the terminals are tightened properly.
• Apply the tightening torque specified in this manual to fasten the terminals.
41
• 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.
• Replace the drive if the fault continues.
Too Many Speed Search Restarts
SEr
The number of speed search restarts exceeded the number set to b3-19.
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
Enable Bi-directional Speed Search (b3-14 = "1").
Pull-Out Detection
STO
Motor pull-out has occurred.
• Enter the correct motor code for the PM being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the Test Report provided for the motor.
• Increase the value set to n8-55 (Load Inertia for PM).
• Increase the value set to n8-51 (Pull-In Current during Accel/Decel for PM).
• Reduce the load.
• Increase the motor or drive capacity.
Increase n8-55 (Load Inertia for PM).
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Undervoltage Detection 1
UL3
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable time (L6-03).
Check the load for any problems.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on page
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Refer to Wire Gauges and Tightening Torque on page
247.