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Table 37: Digital Inputs
Digital Input Signals
Signal Name
Function
Remote Halt
This function can be used to stop the machine using a digital input. The method used
to stop the machine will depend on the Remote Halt Mode setting, which can be either
Timed
or
Immediate
. If set to
Timed
, the machine will unload and blowdown using its
configured timers if it is running when the Remote Halt signal becomes active. If set to
Immediate
, the machine will immediately depressurize and perform a soft stop when
the Remote Halt signal becomes active. The machine will not start if the Remote Halt
signal is active.
Remote Halt Enable
If this function is assigned to an input and is active, the Remote Halt functionality will
be enabled. If it is not active, the Remote Halt signal will be ignored.
Remote Load
This function will cause the compressor to load immediately if the current delivery
pressure is below the unload pressure setpoint on the machine. If it is assigned but
inactive, the machine will unload immediately and will act as if the pressure unload
setpoint has been exceeded.
Remote Load Enable
If this function is assigned to an input and is active, the Remote Load functionality will
be enabled. If it is not active, the Remote Load signal will be ignored.
Active Regulation
This function will cause the compressor to immediately unload if it is assigned to an
input and not active. If it is active, normal pressure regulation will be enabled.
Active Regulation
Enable
If this function is assigned to an input and is active, the Activate Regulation
functionality will be enabled. If it is not active, the Activate Regulation signal will be
ignored.
Turn Valve Full Open
This function will cause a machine with turn valve modulation to force the turn valve to
the full open position (minimum flow).
Turn Valve Full Close
This function will cause a machine with turn valve modulation to force the turn valve to
the full closed position (maximum flow).
Inlet Modulation Mode
This function will disable the inlet modulation functionality if active, and the machine
will run in load / unload mode. If assigned to an input and not active, the inlet valve will
be allowed to modulate.
Secondary Pressure
Band
This function enables the secondary (P2) pressure band when it is active.
Timer Start Override
This function is used to override the Timer Start / Stop functionality. For example, if a
machine is set to start at 6AM but needs to be started at 5:30AM, a digital input set to
this function could be used to override the timer functionality and allow the machine to
start without reconfiguring the settings on the controller. This is an edge-triggered input
that does not need to remain active after the machine starts (it can be tied to a
momentary signal or push button).
Active Capacity Limit
This function is used to activate the capacity limits set in the HMI for minimum and
maximum speed will be activated.
Separator Warning
If this digital input is active, a separator warning will be triggered.
Separator Fault
If this digital input is active, a separator fault will be triggered.
Dryer Running
This function provides running status feedback from a connected dryer. If the input is
assigned, a dryer aux contact fault will be triggered if the dryer does not provide
running feedback after the dryer start output is activated.
Dryer Warning
If this digital input is active, a dryer warning will be triggered.
Dryer Fault
If this digital input is active, a dryer fault will be triggered.
Air Filter Warning
If this digital input is active, an air filter warning will be triggered.
External Warning
If this digital input is active, an external warning will be triggered. This can be
connected to any general condition that does not fall under the available
programmable functions on the controller.
External Maintenance
If this digital input is active, an external maintenance alarm will be triggered. This can
be connected to any general condition that does not fall under the available
programmable functions on the controller.
External Fault
If this digital input is active, an external fault condition will be triggered. This can be
connected to any general condition that should stop the compressor that does not fall
under the available programmable functions on the controller.
