Analog Condenser Control
The following is a description of the Condenser Control
logic when only analog Condenser Control is enabled.
If the System Discharge Pressure is above the Condenser
Control setpoint:
• If the System Discharge Pressure is greater than
or equal to the Condenser Control setpoint plus
the analog control upper dead band, then
condenser output #4 is turned on (if it is not
already on) and the analog output signal is
increased using the response time.
If the System Discharge Pressure is below the Condenser
Control setpoint:
• If the System Discharge Pressure continues to
fall and is less than or equal to the Condenser
Control setpoint minus the analog control lower
dead band, then the analog output signal is
decreased using the response time. When the
signal reaches its minimum output, condenser
output #4 is turned off.
Digital and Analog Condenser Control
The following is a description of the Condenser Control
logic when digital and analog Condenser Control is
enabled:
If the System Discharge Pressure is above the
Condenser Control setpoint, the following is repeated
until all condenser outputs are turned on:
• If the System Discharge Pressure is greater than
the Condenser Control setpoint, plus the Digital
Control Upper Dead Band for the Upper Delay
period of time, the first output is turned on. If the
System Discharge Pressure remains high for
another Upper Delay period of time, the second
output is turned on. This continues until all the
available outputs are turned on, or the System
Discharge Pressure drops below the Control
Setpoint plus the Upper Deadband.
• In addition, after Condenser Output #4 is turned
on, the analog output signal begins to increase.
This continues as long as the System Discharge
Pressure is greater than the Condenser Control
setpoint plus the Analog Control Upper Dead
Band. After Condenser Output #4 turns on,
additional digital outputs will not turn on until the
analog output signal reaches 100%. The rate at
which the analog output signal increases, or
decreases, is determined by the Response Time.
If the System Discharge Pressure is below the
Condenser Control setpoint the following is repeated
until all condenser outputs are turned off:
• If the System Discharge Pressure is less than the
Condenser Control setpoint minus the Analog
Control Lower Dead Band, the analog output
begins to decrease. After the analog output
signal reaches 0%, it the System Discharge
Pressure has been less than the Condenser
Control setpoint minus the Digital Control Lower
Dead Band for the Lower Delay period of time,
the last output is turned off. If the System
Discharge Pressure remains low for another
Lower Delay period of time, the second output is
turned off. This continues until all the outputs are
turned off, or the System Discharge Pressure
rises above the Control Setpoint minus the Lower
Deadband.
FRICK
QUANTUM™ COMPRESSOR CONTROL PANEL S90-010 O
OPERATION Page 49
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