Slide Valve Setpoints
The Slide Valve Setpoints screen is shown if it applies to
this compressor model (Reference Compressor Model
Differences). The following Slide Valve setpoints are on
this control setpoint screen:
Highest Slide Valve Position to allow Compressor
Start - If the Slide Valve is above this Slide Valve
position the compressor will not be allowed to start.
Starting Period before Slide Valve will load – The
amount of time, in seconds, after the compressor
starts, that the Slide Valve will not load. This timeout
period is displayed on the Operator Status screen as
a Stop Load Starting Inhibit message with time to
expire.
Stopping Period Slide Valve Unload – This setpoint
comes in to play if the value is > zero and the
[Compressor Manual Stop] button is pressed. The
compressor will not stop, but will enter a stopping
mode in which the Slide Valve is given a Force
Unload until it is below the Highest Slide Valve
Position To Allow Starting The Compressor setpoint
before stopping –OR- the timeout period expires.
NOTE: If the [Stop Button] is pressed again for a
second time, the compressor will stop.
Minimum Slide Valve Position when in Autocycle -
If automatic cycling (autocycle) is active, this is the
Slide Valve position a running compressor will not
unload below. This setpoint is useful for pumping
down the refrigerant in a system.
Note the warning that says: CAUTION: High settings
may cause motor overload trip.
Note: During the compressor stopping, the Slide Valve
unload solenoid remains energized until the Slide
Valve is unloaded to or below the Highest Slide Valve
position to allow starting the compressor setpoint. If
the Slide Valve does not unload below this setpoint
within 5 minutes, the alarm message Compressor
Unable to Unload – Alarm is issued.
The Hot Gas Bypass and Slide Valve Setpoints digital
outputs are displayed on the Slide Valve setpoints
screen if it applies to this compressor model
(Reference Compressor Model Differences) and if Hot
Gas Bypas/SV Setpoint was enabled in Panel Setup.
The on or off status of the outputs and the setpoint
will be shown. The following outputs are used as an
indicator of a Slide Valve position:
Hot Gas Bypass/Slide Valve Setpoint - This
output is intended to be used for either Hot Gas
Bypass control or as an indication of a Slide
Valve position.
Slide Valve Setpoint 1
Slide Valve Setpoint 2
The following setpoint for the digital output is provided:
On when below - The digital output is turned on
when the Slide Valve position is below this setpoint
and turned off when the Slide Valve position equals or
exceeds this setpoint.
Note: These setpoints are active only when the
compressor is running.
The following special selection is on this screen:
[Economizer Setpoints] - Shows the Economizer
Setup screen, shown on the following page.
S90-010 O FRICK QUANTUM™ COMPRESSOR CONTROL PANEL
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36 OPERATION
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