Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 258)

HOA Keypad Display Fault Name
Uv2
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
Cause Possible Solution
In drive models 2A0004 to 2A0056 or
4A0002 to 4A0031, L2-02 was changed
from its default value without installing a
Momentary Power Loss Ride-Thru unit
Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit.
Control power supply wiring is damaged
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace the control board, the entire drive, or the control power supply. For
instructions on replacing the control board, contact Yaskawa or a Yaskawa representative.
Internal circuitry is damaged
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
HOA Keypad Display Fault Name
Uv4
<1>
Gate Drive Board Undervoltage
Voltage drop in the gate drive board circuit
Cause Possible Solution
Not enough power is being supplied to the
gate drive board.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the gate drive board or the entire drive. For instructions on replacing
the gate drive board, contact Yaskawa or a Yaskawa representative.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display Fault Name
Uv3
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
The soft-charge bypass circuit failed.
Cause Possible Solution
The relay or contactor on the soft-charge
bypass circuit is damaged
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
HOA Keypad Display Fault Name
VLTS Volute-Thermostat Fault
Cause Possible Solution
The digital input assigned to the volute/
thermostat input (H1-0o = 88 or 89) is
active.
Check the wiring or wait for the volute or motor to cool.
Both volute/thermostat inputs are
programmed simultaneously (H1-0o = 88
and 89).
• Program only one digital input to either H1-0o = 88 or H1-0o = 89.
• Auto-restart of this fault is controlled by parameter L5-53, Volute-TStat Retry Selection.
HOA Keypad Display Fault Name
voF
Output Voltage Detection Fault
Problem detected with the voltage on the output side of the drive.
Cause Possible Solution
Hardware is damaged. Internal drive
module MC / FAN overheat protection
circuit board is due to abnormal ambient
operating power.
• Lower ambient temperature.
• Replace the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or a Yaskawa representative.
5.2 Fault Detection
258 YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide