Ingersoll-Rand R110IU-10, Руководство пользователя

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manually be re-started by any of the standard starting methods. Pressing the control panel start
button, or if Remote Control has been turned on, closing the Remote Start signal or sending a serial
start command.
ENH Integral Sequencing
- It will be possible to sequence three Intellisys controllers without a
system controller. This is possible through a cable connecting, up to three Intellisys S3 controllers,
and using one of the controllers as a system controller.
MODULATION CONTROL OPTION
Modulation hardware extends the control types to Modulation (capacity control) and Automatic
Control System when the compressor switches between ’On/Off line’ and modulation as demand
varies. Safety of operation is provided for as the compressor will shut down if excessive
temperatures, electrical overload conditions, or system over pressure should occur.
For those plants which have relatively high constant air demand relative to the compressor capacity,
the recommended control mode is modulation. The modulation control system retains the features of
the on-line / off-line control, but also provides for throttling of the inlet flow up to the off-line air
pressure set point value. By applying line pressure to an adjustable modulator valve, the throttling
position of the inlet valve is controlled, thus allowing the modulator to ”trim” the inlet valve position as
dictated by the line pressure.
The modulating pressure range is about 0.3 bar (4.0 psid) and the modulator normally should be set
to straddle the compressor rated pressure. Modulation begins when the line pressure reaches about
99 percent of the compressor rated pressure and continues as/if the line pressure rises. Modulation
becomes stable when the compressor output equals the plant air demand. When the modulation is at
the factory setting, the maximum capacity reduction will be approximately 60 percent of the
compressor rated capacity (as indicated in Figure 1).