YASKAWA iQpump Micro CIMR-PW Series User Manual page 278

6.4 Alarm Detection
LED Display LCD Display
An error has occurred in the Real-Clock
Time function of the HOA keypad.
LED Display LCD Display
trpc
Cause
IGBTs have reached 90% of their expected
performance life.
LED Display LCD Display
vl3
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
LED Display LCD Display
vl4
Cause
Parameter settings are not appropriate for the
load
There is a fault on the machine side
LED Display LCD Display
vl6
Underload Det
Cause
The output current has fallen below the motor
underload curve defined in L6-14 for longer
than the time set to L6-03
LED Display LCD Display
vu
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.
278
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your nearest
sales representative.
IGBT Maintenance Time (90%)
TrPC
IGBTs have reached 90% of their expected performance life.
Replace the drive.
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the
UL3
allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the
UL4
allowable time (L6-06).
Check L6-05 and L6-06 settings
Check the load for any problems.
Motor Underload
UL6
The load has fallen below the underload curve defined in L6-14.
6
Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal
operation.
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 control drive input power voltage. This alarm outputs if L2-01 ≠0 and DC bus voltage < 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.
Torques on page 50
• 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 the drive if U4-05 exceeds 90%.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
Minor Fault Name
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
for details.
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
Refer to Wire Gauges and Tightening