YASKAWA A1000

6.5 Alarm Detection
356 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 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
Minor Fault
(H2- = 10)
A digital input set to 67H (MEMOBUS/Modbus
test
) was closed while the drive was running.
Stop the drive and run the test again.
YES
Digital Operator Display Minor Fault Name
<1>
THo
Thermistor Disconnect
The th
ermistor that detects motor temperature has become disconnected.
Cause Possible Solutions
Minor Fault
(H2- = 10)
The motor thermistor is not connected properly
. Check the thermistor wiring. YES
Digital Operator Display Minor Fault Name
TrPC
IGBT Maintenance Time (90%)
IGBT
s have reached 90% of their expected performance life.
Cause Possible Solutions
Minor Fault
(H2- = 10)
IGBTs have reached 90% of their expected
performance life.
Replace the drive.
YES
Digital Operator Display Minor Fault Name
UL3
Undertorque Detection 1
Drive ou
tput current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-02 for longer than L6-03 time.
Cause Possible Solutions
Minor Fault
(H2- = 10)
Inappropriate parameter settings. Check parameters L6-02 and L6-03.
YES
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 ou
tput current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-05 for longer than L6-06 time.
Cause Possible Solutions
Minor Fault
(H2- = 10)
Inappropriate parameter settings. Check parameters L6-05 and L6-06.
YES
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 th
e following conditions was true when the drive was stopped and a Run command was entered:
• DC bus voltage dropped below th
e level specified in L2-05.
• Contactor to suppress inrush current i
n the drive was opened.
• Low voltage in the control drive input power. This alarm outputs on
ly if L2-01 is not 0 and DC bus voltage is under L2-05.
Cause Possible Solutions
Minor Fault
(H2- = 10)
Phase loss in the drive input power. Check for wiring errors in the main circuit drive input power. Correct the wiring.
YES
Loose wiring in the drive input power terminals.
• Ensure the terminals have been prop
erly tightened.
• Apply the tightening torque to the terminals as specified. Refer to Wire Gauges and Tightening Torque on
page 76
There is a problem with the drive input power
vol
tage.
• 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 transf
ormer 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.
Digital Operator Display Minor Fault Name
voF
Output Voltage Detection Fault
There i
s a problem with the output voltage.
Cause Possible Solutions
Minor Fault
(H2- = 10)
Hardware is damaged.
Repl
ace either the control board or the entire drive. For instructions on replacing the control board, contact
YASKAWA or your nearest sales representative.
YES
<1> Occurs in models CIMR-A4A0930 and 4A1200.