Yaskawa R1000 Series Power Regenerative Unit User Manual
Page 108
5.4 Alarm Detection
108
YASKAWA ELECTRIC TOEP C710656 08B YASKAWA Power Regenerative Unit - R1000 Instruction Manual
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
PFDv
Power Supply
Frequency Pre-Alarm
The input power supply frequency fluctuates more than
±15 Hz.
The regenerative unit enters the baseblock state during pre-alarm. When the
input supply frequency returns to normal conditions, the regenerative unit will
release the base block and continue to operate.
YES
Cause
Possible Solutions
Momentary power loss has occurred.
Activate the momentary power loss ride-thru.
Voltage distortion is large.
Increase the power supply capacity.
Voltage detection failure
Confirm r1/l11, s1/l21, t1/l31 are correctly wired.
Phase loss has occurred.
Confirm the power supply and regenerative unit is correctly connected.
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
SE
MEMOBUS/Modbus
Test Mode Fault
A MEMOBUS/Modbus communications test was performed during operation.
YES
Cause
Possible Solutions
A fault occurred during MEMOBUS/Modbus
Communications Test Mode.
Always stop the operation of the regenerative unit before you perform MEMOBUS/Modbus
communications tests.
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
SRC
Phase Order Fault
The phase order detection direction for the input power supply changed after
the power supply was turned on.
YES
Cause
Possible Solutions
A momentary power loss occurred.
Investigate and correct the cause and reset the fault.
Refer to
Diagnosing and Resetting Faults on page 112
for details.
An input power supply wiring terminal is loose.
The fluctuation in the voltage of the input
power supply is too large.
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
Uv
Undervoltage
One of the following conditions was true when the regenerative unit was
stopped and a Run command was entered:
• DC bus voltage dropped below the level specified in L2-05.
• Contactor to suppress inrush current in the regenerative unit was opened.
• Low voltage in the control regenerative unit input power. This alarm outputs
only if L2-01 is not 0 and DC bus voltage is under L2-05.
YES
Cause
Possible Solutions
Phase loss in the regenerative unit input power. Check for wiring errors in the main circuit input power. Correct the wiring.
Loose wiring in the regenerative unit input
power
terminals.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified. Refer to
There is a problem with the regenerative unit
input power voltage.
• Check the voltage.
• Lower the voltage of the regenerative unit input power so that it is within the limits listed in the
specifications.
A power loss occurred.
Improve the power supply.
Internal circuitry is worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire regenerative unit if U4-05 exceeds 90%. For
instructions on replacing the control board, contact Yaskawa or your nearest sales representative.
The regenerative unit 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 regenerative unit input power transformer.
Air inside the regenerative unit is too hot.
Check the temperature inside the regenerative unit.
The CHARGE light is broken or disconnected.
Replace either the control board or the entire regenerative unit. For instructions on replacing the
control board, contact Yaskawa or your nearest sales representative.
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
vrE
Resonance Detection
A filter resonance fault was detected or there is a harmonic component on the
power supply side.
YES
Cause
Possible Solutions
There is noise on the power supply line.
Investigate the source of the noise and implement countermeasures.
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