Mitsubishi Electric EMU4-CNT-MB, Руководство пользователя

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Lower-lower limit value
When a pressure value drops below the lower-lower limit value, the next control operation is executed once. After that, until
the pressure value rises to the lower limit value or more, the same operation as
■
Lower limit value is repeated.
When the pressure value becomes the lower-lower limit value or more once and then drops below the lower-lower limit
value again, the control is executed again.
*The adjustment operation time is a delay time when a compressor is switched from the stop mode to the loaded operating
mode.
(1) When the control target is in the stop mode, it is switched to the loaded operating mode regardless of the set delay
time (adjustment operation time and start delay time).
Lower limit
value
Lower-lower
limit value
Compressor 1
Stop Operation (load)
Compressor 2
Stop Operation (load)
Compressor 3
Stop Operation (load)
Compressor 4
Operation (load)
① ②
④
①
A pressure value drops below the lower limit value. At the next control period (01 min), a compressor with the highest priority,
compressor 1, will be switched to the loaded operating mode.
②
The compressor 1 is switched to the loaded operating mode.
A compressor with the highest priority in compressors with the stop mode, compressor 2, is targeted and it keeps standby mode
until the adjustment operation time is over.
The pressure value drops below the lower-lower limit value. At the next control period (02 min), the compressor 2 will be
switched to the loaded operating mode regardless of the adjustment operation time and start delay time.
③
The compressor 2 is switched to the loaded operating mode regardless of the adjustment operation time and start delay time.
A compressor with the highest priority in compressors with the stop mode, compressor 3, is targeted and it keeps standby mode
until the adjustment operation time is over.
④
The standby mode is kept until the adjustment operation time is over.
⑤
Since the adjustment operation time is over, the standby mode is kept until the start delay time is over.
⑥
The standby mode is kept until the start delay time is over.
Although the pressure value drops below the lower-lower limit value, the control is not executed because no compressor with
the stop mode exists at the next control period (06 min).
⑦
The compressor 3 is switched to the loaded operating mode.
Since no compressor with the stop mode exists, the control is not executed.
*The parts written in red indicate the control operation executed when the pressure value is below the lower-lower limit value.
③ ⑤ ⑥
⑦
<Example of action>
Adjustment operation time: 2 minute
Start delay time: 2 minute
Adjustment operation time
Start delay time
Measurement value for
determination
Pressure measured value
Priority
High
Low
Control target at
the start of control
59 min 00 min 01 min 02 min 03 min
04 min
05 min
06 min