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5.2 Fault Detection
114
YASKAWA ELECTRIC
TOEP C710656 07A YASKAWA Power Regenerative Converter - D1000 Instruction Manual
Digital Operator
Display
Fault Name
Details
oH1
Overheat 1 (Heatsink
Overheat)
The heatsink temperature exceeded the converter overheat level. Overheat level is determined by
o2-04 (drive model selection).
Cause
Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the converter.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the converter that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Reduce the load.
Internal cooling fan is stopped
• Replace the cooling fan. Refer to page
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
Digital Operator
Display
Fault Name
Details
oL2
Converter Overload
The thermal sensor of the converter triggered overload protection.
Cause
Possible Solution
Load is too heavy
Reduce the load.
Converter capacity is too small
Replace the converter with a larger model.
The converter does not operate.
• Start converter operation first, and then start converter operation.
Digital Operator
Display
Fault Name
Details
oPr
External Digital
Operator Connection
Fault
The external operator has been disconnected from the converter.
Note:
An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The Run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
Cause
Possible Solution
External operator is not properly connected to
the converter
• Check the connection between the operator and the converter.
• Replace the cable if damaged.
• Turn off the input power and disconnect the operator. Reconnect the operator and reapply
converter input power.
Digital Operator
Display
Fault Name
Details
ov
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
• For 200 V class models: approximately 410 V
• For 400 V class models: approximately 820 V
Cause
Possible Solution
The regenerative load is too large.
Reduce the regenerative load.
Input power voltage is too high
• Check the voltage.
• Lower input power voltage within the limits listed in the specifications.
converter fails to operate properly due to noise
interference
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit lines, main
circuit lines, and ground wiring.
The wiring of the power supply voltage
detection circuits (
) and
the wiring of the main circuit terminals
(R/L1, S/L2, and T/L3) is not correct.
• Correct the wiring.
r1/ 11, 1/ 21, t1/ 31