Fan Control - Hitachi RCUE40AG2 Service Manual

Control System
.

4.17.1 Fan Control

1. Cooling operation
In this series, fan speed is controlled by inverters and adjusts depending on discharge pressure. Target high
pressure is set based on the ambient temperature, and revolution number is increased / decreased by PID
control. The unit number is not changed.
Inverter output Max Frequency
Max Frequency: 66
Min Frequency: 10

Fan control imaged
fi gure
Recalculation of fan speed is done every 10 sec.
−
Calculation is not performed when high pressure target value is within ±0.1MPa.
−
The following control is performed in case of sudden change.
−
pag. 76
SMGB0003 rev.0-01/2007
Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode Silence priority mode
Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode Standard mode
Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode Saving energy priority mode
Start-up at 10 Hz Start-up at 10 Hz
Fan speed is increased when
high pressure is almost over
the target
High pressure
Fan speed is increased when
high pressure is almost below
the target
Fan frequency