Daewoo DWD-WD125 Series Service Manual page 27

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2-4. How to Control Voltage (During abnormal operation)
1) Voltage Control
① Normal Voltage
DC-link voltage after wave rectification is directly impressed to IPM as 310 ~ 330V.
When motor starts operation, DC voltage changes with energy consumed by motor and/ or counter
electromotive force of motor.
② Identifying Abnormal Voltage
A. Occurrence of counter electromotive force
☞ In case of 450V or higher
B. Instant power failure and excessive energy consumption
☞ In case of 185V or lower
2-5. How to Control Current (During abnormal operation)
1) Current Abnormality Detection
① Abnormal if DC current flowing through IPM measured during high-speed motor rotation is
10A~12A or higher
② Detection of abnormal current to be carried out by saving higher value among instant current values
and updating the data
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