Figure 45 Setpoints Parameters Screen - Emerson Liebert Challenger 3000 User Manual

Figure 45 Setpoints parameters screen - Page 3
SETPOINTS (pg 3 of 6)
S123
S124
S125
S126
S127
S128
S129
S130
S131
S132
S133
Supply Sensor—This parameter selects how the supply sensor will be used by the control. The selec-
tions for this parameter are Disabled, Cooling Only, Control and Limit. See 3.8 - Event Types and
Properties for a detailed description. The supply sensor can only be set to Cooling Only and Control
on chilled water units. The chilled water unit must have the valve feedback if the valve type is a 3P
valve (stem). Motorized ball valves do not require the feedback feature.
Supply Setpoint—This parameter sets the temperature setpoint for the supply sensor when it is set
to Cooling Only, Control or Limit.
Supply Control Type—This parameter selects the type of control the system will use to activate
cooling. A detailed description of each control type can be found in 3.7 - Supply Control.
Supply Proportional Band—When the supply sensor is set to Cooling Only or Control then this
parameter adjusts the valves rate of change based on the actual sensor values deviation from set-
point. The smaller this number the faster the valve(s) will increase cooling capacity. Too small of a
number may cause the unit to excessively reposition the valve.
Supply Integration—This parameter adjusts the capacity of the unit based on time away from set-
point so that accurate temperature control can be maintained. This parameter is only active when
Control Type is set to "PI."
Supply Deadband—This parameter can be set to avoid overshooting of the setpoint and cycling
between the reheats and cooling. The value entered into this field will be split in half by the tempera-
ture setpoint. Example: If the temperature setpoint is 60°F (15.5°C) and a 4°F (2.2°C) deadband is set
then no cooling will be activated until 62°F (16.6°C) and no heating will be activated until
58°F (14.4°C) is reached.
Valve Pulse—This parameter defines the minimum change in the cooling requirement before the
valve will reposition. A greater number decreases the amount of repositions and a smaller number
will increase the response of the valve.
Cooling Filter at 0% / 100%—This parameter filters the controls reaction in order to avoid over-
shoots. The filter value depends on the current control deviation. On setpoint (at 0%), it's typically set
lower (slow), and at the end of the p-band (at 100%), it's typically set higher (faster). The value is
given in % control output change per second.
Return Compensation—for supply control only. This parameter defines the maximum increase
allowed to the supply temperature setting to maintain a return temperature setpoint. When the
return air temperature is above its setpoint and p-band, the supply air setpoint remains unchanged.
As the return air temperature approaches the setpoint, the supply air setpoint will be proportionally
increased to maintain the return temperature setpoint. The maximum increase is defined with the
return compensation parameter.
PASSWORD (Actual Level 0)
Supply Sensor
Supply Setpoint
Supply Control Type
Supply Proportional Band
Supply Integration
Supply DeadBand
Valve Pulse
Cooling Filter at
Return Compensation
for next/previous unit
then to change parameter
0% / 100% / 100.00 / 100%/s
to select parameter
to confirm
63
Service Menu Parameters
UNIT 01
????
Control
50°F
Proportional
12°F
min
0°F
3%
5°F