Yaskawa J1000 Compact Vector Control Drive - Manual (Page 149)

Digital Operator Display Fault Name
PGo
PG Disconnect (for Simple V/f with PG)
No PG pulses are received for longer than the time set to F1-14.
Cause Possible Solution
Pulse input (RP) is disconnected. Reconnect the pulse input (RP).
Pulse input (RP) wiring is wrong. Correct the wiring.
Motor brake engaged. Ensure the motor brake releases properly.
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 C1-08).
• 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
rr
Dynamic Braking Transistor
The built-in dynamic braking transistor failed.
Cause Possible Solution
The braking transistor is damaged. • Cycle power to the drive and check if the fault reoccurs. Refer to Diagnosing
and Resetting Faults on page 162 .
• Replace the drive if the fault continues.
The control circuit is damaged.
Digital Operator Display Fault Name
SC IGBT Short Circuit
Cause Possible Solution
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710606 47C YASKAWA AC Drive – V1000 Quick Start Guide 149
5
Troubleshooting