YASKAWA Z1000 User Manual page 224

5.5 Alarm Detection
Digital Operator Display
Cause
Phase loss in the drive input power.
Loose wiring in the drive input power
terminals.
There is a problem with the drive input
power voltage.
Drive internal circuitry is worn.
The drive input power transformer is too
small and voltage drops when the power is
switched on.
Air inside the drive is too hot.
The CHARGE light is broken or
disconnected.
Digital Operator Display
Cause
The Run command has been applied and
the b1-11 timer is active.
224
Undervoltage
One of the following conditions was true when the drive was stopped and a Run command was entered:
• DC bus voltage dropped below the level specified in L2-05.
Uv
• Contactor to suppress inrush current in the drive was opened.
• Low voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC bus voltage
is under L2-05.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified.
Tightening Torque on page
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the specifications.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or your nearest sales representative.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
Check the temperature inside the drive.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
WrUn Waiting for Run
Adjust b1-11 to the desired delay time. The drive sill start normally after the b1-11 timer expires.
Minor Fault Name
Possible Solutions
Refer to Main Circuit Wire Gauges and
81.
Minor Fault Name
Possible Solutions
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual