Yaskawa AC Drive Z1000 Bypass Technical Manual - Manual (Page 228)

The maximum output frequency is set incorrectly Check the E1-03 setting.
Multiple motors are running off the same bypass Set L1-01 to 0 to disable the motor protection function and then install a thermal relay to each motor.
The electrical thermal protection characteristics
and motor overload characteristics do not match.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
The electrical thermal relay is operating at the
wrong level.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01)
HOA Keypad Display Fault Name
FB06
External Motor 1 Overload
Note: A fault reset is not required. An EF0 is sent to the drive and bypass Contactor K3 is
opened.
External overload input is active for motor 1
Cause Possible Solution
Load is too heavy Reduce the load.
Cycle times are too short during acceleration and
deceleration
Increase the acceleration and deceleration times (C1-01 and C1-02).
A general-purpose motor is driven below the rated
speed with a high load
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate in the desired speed range.
HOA Keypad Display Fault Name
FB07
External Motor 2 Overload
Note: A fault reset is not required. An EF0 is sent to the drive and bypass contactor K3 is
opened.
External overload input is active for motor 2
Cause Possible Solution
Load is too heavy Reduce the load.
Cycle times are too short during acceleration and
deceleration
Increase the acceleration and deceleration times (C1-01 and C1-02).
A general-purpose motor is driven below the rated
speed with a high load
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate in the desired speed range.
HOA Keypad Display Fault Name
FB08
Phase Loss Brownout
Note: A fault reset is required. An EF0 is sent to the drive and drive output contactor K2 and
Bypass contactor K3 are opened.
The contactor coil voltage was continuously detected below the configured brownout voltage level
for the configured brownout time.
Cause Possible Solution
Input power is too low. Verify input power is sufficient to power the bypass.
Settings for brownout are incorrect. Verify Z1-27 (Brownout Voltage Level) and Z1-28 (Brownout Time) are set properly.
HOA Keypad Display Fault Name
FB09
Phase Loss Blackout
Note: A fault reset is required. An EF0 is sent to the drive and drive output contactor K2 and
Bypass contactor K3 are opened.
The contactor coil voltage was detected below the configured blackout voltage level.
Cause Possible Solution
Input power is too low or has dipped too low. Verify input power is sufficient to power the bypass.
Settings for blackout are incorrect. Verify Z1-29 (Blackout Voltage Level) is set properly.
6.4 Fault Detection
228 YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual