Yaskawa R1000 Series Power Regenerative Unit User Manual
Page 106
5.4 Alarm Detection
106
YASKAWA ELECTRIC TOEP C710656 08B YASKAWA Power Regenerative Unit - R1000 Instruction Manual
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
HCA
Current Alarm
Regenerative unit current exceeded overcurrent warning level (150% of the
rated current).
YES
Cause
Possible Solutions
Load is too heavy.
Reduce the load for applications with repetitive operations (i.e., stops and starts), or replace the
regenerative unit.
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
LT-1
Cooling Fan
Maintenance Time
The cooling fan has reached its expected maintenance period and may need to
be replaced.
Note: An alarm output (H2- = 10) will only be triggered if both (H2- =
2F and H2- = 10) are set.
YES
Cause
Possible Solutions
The cooling fan has reached 90% of its
expected performance life.
Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
Digital Operator
Display
Minor Fault Name
Detail
Alarm Output
(H2- = 10)
LT-2
Capacitor Maintenance
Time
The main circuit and control circuit capacitors are nearing the end of their
expected performance life.
Note: An alarm output (H2- = 10) will only be triggered if H2- = 2F.
YES
Cause
Possible Solutions
The main circuit and control circuit capacitors
have reached 90% of their expected
performance lives.
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)
LT-3
Soft Charge Bypass
Relay Maintenance
Time
The DC bus soft charge relay is nearing the end of its expected performance
life.
Note: An alarm output (H2- = 10) will only be triggered if H2- = 2F.
YES
Cause
Possible Solutions
The DC bus soft charge relay has reached 90%
of expected performance life.
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)
oH
Heatsink Overheat
The temperature of the heatsink exceeded the overheat pre-alarm level set to
L8-02 (90-100
°C). Default value for L8-02 is determined by o2-04 (Unit
Model Selection).
YES
Cause
Possible Solutions
Surrounding temperature is too high
• Check the surrounding temperature.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool surrounding area.
• Remove anything near regenerative unit that may cause extra heat.
Airflow around the regenerative unit is
restricted.
• Provide proper installation space around the regenerative unit as indicated in the manual. Refer
to
Installation Orientation and Spacing on page 25
for details.
• Allow for the proper space and ensure that there is sufficient circulation around the control
panel.
• Check for dust or other foreign materials clogging the cooling fan.
• Clear debris caught in the fan that restricts air circulation.
The ambient temperature is too high.
Check the ambient temperature.
• Improve ventilation in the control panel.
• Install a cooling device (e.g., a cooling fan or air conditioner) and lower the ambient
temperature.
• If there are heat-generating objects nearby, remove them.
The load is too large.
Measure the output current.
Lower the load.
Internal cooling fan has stopped.
• Replace the cooling fan. Refer to page
for details.
• After replacing the regenerative unit, set parameter o4-03 to 0 to reset the cooling fan operation
time.
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