Hitachi WJ Series

Chapter 9 Inverter Functions
9-9-3
9.9.2 Restriction to Avoid Overcurrent
 How to avoid overcurrent errors caused by impact loads?
 How to avoid tripping when the current increases momentarily?
 How to accelerate the motor while suppressing the current flowing to the motor?
 How to avoid tripping when sudden load fluctuations occur?
 The overcurrent suppression function can suppress overcurrent caused by sudden current
increase during quick acceleration, etc.
 When overcurrent suppression function is enabled, this function is performed when the output
current exceeds 180% of the rated current to prevent overcurrent trip.
 When "Enable (with voltage reduction) (02)" is set for "Overcurrent suppression enable [b027]",
the output voltage is reduced during overcurrent suppression function in operation to enhance
the overcurrent suppression effect.
 Disable this function when using the inverter for lifts, etc. Suppressing the current may result in
insufficient torque, causing the load cage or suspended object to slide off.
 Even if this function is enabled, an overcurrent trip may occur when the current increases too
suddenly due to an impact load or other causes.
Code
Item
Description
Data
[b027]
Overcurrent
suppression enable
Disable
00
Enable (without voltage reduction)
01
Enable (with voltage reduction)
02
Q
A
!