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<Details on the control by the upper/lower limit monitoring>
This function sets the upper-upper limit, upper limit, lower limit, and lower-lower limit values in advance. According to the
result of the upper/lower limit monitoring of a measurement value, the operation mode of a compressor is controlled.
The control unit collects a measurement value from the extension unit every minute, and executes the upper/lower limit
monitoring of the measurement value. According to the monitoring result, the operation mode of a compressor is determined.
At the next control period, the operation mode is controlled.
Furthermore, in order to avoid a sudden start/stop of the compressor, a control delay time can be set. The control timing is
delayed by the set delay time from the original one.
There are a start delay time and adjustment operation time as for the delay time:
・
Start delay time:
A delay time when a compressor is switched from the stop mode to the loaded operating mode.
・
Adjustment operation time: A delay time when a compressor is switched from the unloaded operating mode to the stop
mode or from the stop mode to the unloaded operating mode.
*When the compressor is switched from the stop mode to the unloaded operating mode, the control timing is delayed by
the total time of start delay time and adjustment operation time.
From the next page, the details of specific controls will be explained.
*The measurement value of the extension unit represents a measurement value for a few seconds from every minute
(**:**:00).
Time
Collect a measurement
value and the
upper/lower limit
monitoring determines
the operation mode.
Control the operation
mode.
*ON/OFF contact output
Action of control unit
*Delay time: 0 min
Action of control unit
*Delay time: 1 min
Delay time: 1 min
Upper-upper
limit value
Upper limit
value
Pressure
59 min
00 min
01 min
Lower limit
value
Lower-lower
limit value
Collect a measurement
value and the
upper/lower limit
monitoring determines
the operation mode.
Collect a measurement
value and the
upper/lower limit
monitoring determines
the operation mode.
Collect a measurement
value and the
upper/lower limit
monitoring determines
the operation mode.
Control the operation
mode.
*ON/OFF contact output
Control the operation
mode.
*ON/OFF contact output
Collect a measurement
value and the
upper/lower limit
monitoring determines
the operation mode.
Collect a measurement
value and the
upper/lower limit
monitoring determines
the operation mode.
