6.5 Alarm Detection
294
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Digital Operator Display
Minor Fault Name
SE
MEMOBUS/Modbus Communication Test Mode Error
Note:
This alarm will not trigger a multi-function output terminal that is set for alarm output (H2-
= 10).
Cause
Possible Solutions
A digital input set to 67H (MEMOBUS/Modbus
test) was closed while the drive was running.
Stop the drive and run the test again.
Digital Operator Display
Minor Fault Name
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Cause
Possible Solutions
IGBTs have reached 90% of their expected
performance life.
Replace the drive.
Digital Operator Display
Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-02 for longer than L6-03 time.
Cause
Possible Solutions
Inappropriate parameter settings.
Check parameters L6-02 and L6-03.
Load has dropped or decreased significantly.
Check for broken parts in the transmission system.
Digital Operator Display
Minor Fault Name
UL4
Undertorque Detection 2
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-05 for longer than L6-06 time.
Cause
Possible Solutions
Inappropriate parameter settings.
Check parameters L6-05 and L6-06.
The load has dropped or decreased significantly.
Check for broken parts in the transmission system.
Digital Operator Display
Minor Fault Name
Uv
Undervoltage
One of the following conditions was true :
• DC bus voltage dropped below the level specified in L2-05.
• 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.
Note:
The alarm output (H2-
= 10) will not be triggered when the drive is in KEB deceleration.
Cause
Possible Solutions
Phase loss in the drive input power.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
Loose wiring in the drive input power terminals.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified.
Refer to Wire Gauges and Tightening Torque on page 54
There is a problem with the drive input power
voltage.
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the specifications.
Drive internal circuitry is worn.
• 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.
The drive input power transformer is too small and
voltage drops when the power is switched on.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
Air inside the drive is too hot.
Check the temperature inside the drive.
The CHARGE light is broken or disconnected.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
KEB is being performed.
KEB can be triggered unintentionally. Check settings in the S4 group and the Power Loss Detection Relay when using such a device
(H1-
= 65/66).
Digital Operator Display
Minor Fault Name
voF
Output Voltage Detection Fault
There is a problem with the output voltage.
Cause
Possible Solutions
Hardware is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
