Hitachi WJ-200 Variable Frequency Drive (VFD) FAQ

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My drive is always on, even when the dryers are not running. Why?

Hitachi inverters allows us to run values in the slight negative, further reducing backpressure and also removing condensate from the dryer cylinders while not in operation. In northern climates this is especially useful when outside temperatures are low and nighttime inactivity can result in the cold air returning down the duct into the dryer baskets. This cooling of air produces water and the potential for a delayed startup the following morning.

If I don’t want the drive to run all night, what can I do?

Adjust parameter F001 to 55.00; this will change the set point to a slight positive. To get to parameter F001 press the ESC key until F001 appears, then press set.