Hitachi RCUE210AG2 User Manual

SMGB0003 rev.0-01/2007
pag. 50
Control System
4.1. List of Main Control Function
Item Contents
Water temp.
control
Automatic water temperature control
Outlet water temperature of water side heat exchanger
is detected by thermistor and the position of
compressor slide valve is controlled continuously.
The range of capacity control: 100~15%, Stop (all
models)
models)
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−
Compressor
1. Starting control
∆ control (5 seconds), Starting unload control (30
sec before capacity control).
sec before capacity control).
−
2. Time Guard
Prevention of excessive compressor re-starts (3
minutes)
minutes)
−
3. Sequential starting control
Prevention of compressors’ simultaneous start (1
minute delay) (Unit with more than 1 cycle)
minute delay) (Unit with more than 1 cycle)
−
4. Rotation control
Balance of each compressor running hours (more than
1 cycle)
1 cycle)
−
Current limit control
When unit current reaches to the setting value, power
supply capacity load is reduced. Therefore, unload
operation is performed forcedly for some minutes.
operation is performed forcedly for some minutes.
−
Reverse protection control
3 phase status is detected to avoid the operation in
reverse phase or open phase (before starting and
during running of unit).
during running of unit).
−
Restart function from momentary power failure
In case of momentary power failure (13mm seconds ≤
time ≤ 2 seconds, and under –20% of power voltage),
unit is stopped, and then is restarted when the voltage
is back.
−
Automatic restart function from power failure <option>
In case of power failure of over 2 seconds, the units
are restarted after power supply is back.
In case of long-term power failure, the units are
restarted when oil heater has electricity for a certain
period after the power supply is back.
The units are not started automatically if power failure
happens during stop.
It is an optional setting by Dip Switch (DSW1 pin2).
It is an optional setting by Dip Switch (DSW1 pin2).
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−
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−
Operation error/ wrong setting prevention control
Alarm is output for such operation errors that
changeover from remote to local or from cooling to
heating and wrong setting.
In case that operation order is input by remote
controller when local operation is selected, alarm is
output as safety.
output as safety.
−
−
Forced load control
Forced capacity operation (forced Thermo OFF, forced
capacity control) is performed by external signal
attending to special needs of load.
Control is performed externally by a no-voltage contact
for each compressor.
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−
Second water temperature setting
It is possible to adjust 2 setting temperatures.
1st temperature is set by rotary switch, and 2nd
temperature is set by key operation on the 7 segment.
According to the usage state of loading side, setting
temperature can be switched by external signal (no-
voltage contact input).
voltage contact input).
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Hitachi RCUE210AG2 Specifications

General

Brand	Hitachi
Model	RCUE210AG2
Category	Chiller
Language	English