YASKAWA V1000 Series Installation & Start-Up Manual page 220

5.5 Fault Detection
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.
Note: The magnitude of the braking load trips the braking resistor overheat alarm — NOT the surface temperature.
When the braking resistor is used more frequently than its rating, it 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.
220
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
• 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.
Enabled when L8-01 = 1.
• 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.
Trace Monitors on page
• Replace the drive if the fault continues.
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
245.
Refer to Using Fault