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Remote Speed
Control
This input can be used to control the speed of a variable speed compressor. If the input is
at 4 mA, the controller will run the motor at the minimum speed possible for the current
conditions. If the input is at 20 mA, the controller will run the motor at the maximum speed
possible for the current conditions. In between these two values, the controller will scale
the speed linearly between minimum and maximum based on the input signal. Note that
the Speed Source must be set to Remote on the Settings -> Advanced -> Control page for
this function to control the speed of the compressor.
Motor Current
This input is used to monitor the current of the main compressor motor. When this input is
present, the Motor SFA setting will be used to monitor the motor for high current, and on
some machines will be used to adjust machine operation to reduce motor current (for
example if a turn valve is present).
4.6.5 Analog Outputs:
The
Analog Outputs
tab consists of five signal settings which are shown below in Figure 122. Here the
user can assign channels to various analog outputs on the compressor.
Figure 122: Analog Outputs
Table 41 below lists the signals available on the
Analog Outputs Signals
screen and a brief description
of their function.
Table 41: Analog Outputs
Analog Output Signals
Signal Name
Function
Delivery Pressure
Feedback
This output can be used to monitor the existing value of the analog input for delivery
pressure. The scaling of the output matches the scaling of the delivery pressure
sensor. For most machines, this is as follows: 4mA = -1 bar gauge and 20 mA = 15 bar
gauge.
Discharge Pressure
Feedback
This output can be used to monitor the current value of the analog input for discharge
pressure on machines that have a discharge pressure sensor. The scaling of the
output matches the scaling of the discharge pressure sensor. For most machines, this
is as follows: 4 mA = -1 bar gauge and 20 mA = 3 bar gauge.